Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: EP1130840A3 Filed: 2000-02-29 Issued: 2003-11-19 Patent Holder: (Original Assignee) Toshiba Corp     (Current Assignee) Toshiba Corp Inventor(s): Takashi c/o Intellectual Property Div. Wakutsu Title: Spread-spectrum multicarrier modulation for cellular communication
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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US6643281B1 Filed: 1998-03-05 Issued: 2003-11-04 Patent Holder: (Original Assignee) AT&T Wireless Services Inc     (Current Assignee) Clear Wireless LLC ; Clearwire IP Holdings LLC ; Clearwire Legacy LLC ; Clearwire Communications LLC Inventor(s): David James Ryan Title: Synchronization preamble method for OFDM waveforms in a communications system
[FEATURE ID: 1] compatible base station, transmitter, respective cell, compatible mobile station	station, transceiver, receiver, system, terminal, device, capable	[FEATURE ID: 1] base station, part, wireless discrete multitone spread spectrum communications system
[FEATURE ID: 2] subcarriers, time slots, antennas, first pilots, data, second pilots, specific information, channel estimates	signals, symbols, information, channels, resources, tones, frequency	[FEATURE ID: 2] bandwidth, tone frequencies, weights, outgoing frequencies, synchronization signal, error signal spread, incoming frequencies
[FEATURE ID: 3] frequency domain, cell, beam, receiver	frequency, channel, time, waveform, radio, user, sequence	[FEATURE ID: 3] base station reference instant, remote station, spread signal, phase
[FEATURE ID: 4] time domain	transmission, timing, reference, sequence, delay, duration, temporal	[FEATURE ID: 4] time, time window, remote station clock
[TRANSITIVE ID: 5] comprising	of, by, comprises, having, containing, with, for	[TRANSITIVE ID: 5] comprising, including
[TRANSITIVE ID: 6] configured, formed	defined, used, selected, oriented, disposed, controlled, aligned	[TRANSITIVE ID: 6] arranged
[FEATURE ID: 7] specific pilots, unique	specific, designated, common, uniquely, synchronized, dedicated, fixed	[FEATURE ID: 7] pattern unique, established
[FEATURE ID: 8] claim	embodiment, statement, clair, item, paragraph, clam, feature	[FEATURE ID: 8] claim
[FEATURE ID: 9] specific pilot	set, identity, group, identification	[FEATURE ID: 9] pattern
[FEATURE ID: 10] frequency	direction, time, timing, location, transmission	[FEATURE ID: 10] relative phase error
[FEATURE ID: 11] same time	time, duration, location, position	[FEATURE ID: 11] remote station reference instant
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses subcarriers [FEATURE ID: 2] in a frequency domain [FEATURE ID: 3] and time slots [FEATURE ID: 2] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 5] : a plurality of antennas [FEATURE ID: 2] ; and a transmitter [FEATURE ID: 1] operably coupled to the plurality of antennas ; the transmitter configured [TRANSITIVE ID: 6] to : insert first pilots [FEATURE ID: 2] of a first type onto a first plurality of subcarriers , wherein the first pilots are cell [FEATURE ID: 3] - specific pilots [FEATURE ID: 7] ; and insert data [FEATURE ID: 2] and second pilots [FEATURE ID: 2] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 3] - formed [TRANSITIVE ID: 6] ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 8] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 9] of the cell - specific pilots is unique [FEATURE ID: 7] to a respective cell [FEATURE ID: 1] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 10] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 2] . 8 . A method performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 1] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver [FEATURE ID: 3] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 2] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 11]		1 . A highly bandwidth [FEATURE ID: 2] - efficient communications method , comprising [TRANSITIVE ID: 5] : forming a synchronization burst at an antenna element of a base station [FEATURE ID: 1] , including [TRANSITIVE ID: 5] a plurality of tone frequencies [FEATURE ID: 2] arranged [TRANSITIVE ID: 6] in a distinctive orthogonal frequency division multiplexed pattern unique [FEATURE ID: 7] to the base station ; transmitting the synchronization burst from the antenna element at a base station reference instant [FEATURE ID: 3] of time [FEATURE ID: 4] ; receiving the synchronization burst at a remote station [FEATURE ID: 3] during a remote station receive time window [FEATURE ID: 4] which begins at a remote station reference instant [FEATURE ID: 11] of time established [TRANSITIVE ID: 7] by a remote station clock [FEATURE ID: 4] ; recognizing the pattern [FEATURE ID: 9] of the plurality of tone frequencies as having the base station as the source of the synchronization burst ; transmitting an error signal back to the base station at an instant referenced with respect to the remote station reference instant of time , in response to the recognizing ; deriving from the error signal a correction value related to a relative time error between the base station reference instant of time and the remote station reference instant of time ; and transmitting the correction value to the remote station to correct the remote station clock . 2 . The highly bandwidth - efficient communications method of claim [FEATURE ID: 8] 1 , wherein deriving further comprises : deriving from the error signal a second value related to a relative phase error [FEATURE ID: 10] between the base station and the remote station ; and transmitting the second value to the remote station to correct the remote station . 3 . The highly bandwidth - efficient communications method of claim 1 , wherein forming the synchronization burst comprises : selecting the distinctive orthogonal frequency division multiplexed pattern unique to the base station ; computing spreading weights [FEATURE ID: 2] at the base station to spread an outgoing synchronization signal over a plurality of outgoing frequencies [FEATURE ID: 2] , using the pattern ; and spreading the synchronization signal [FEATURE ID: 2] over the plurality of outgoing frequencies using the computed spreading weights , thereby forming the synchronization burst . 4 . The highly bandwidth - efficient communications method of claim 1 , wherein deriving the error signal at the base station comprises : receiving at the base station a spread signal [FEATURE ID: 3] comprising an incoming signal that includes the error signal spread [FEATURE ID: 2] over a plurality of incoming frequencies [FEATURE ID: 2] ; adaptively despreading the spread signal received at the base station by using despreading weights , recovering the error signal ; deriving from the error signal the relative time error ; comparing the relative time error with a desired relative time difference value ; calculating the correction value in response to the comparing , to minimize a difference between the relative time error and the desired relative time difference value . 5 . The highly bandwidth - efficient communications method of claim 1 , wherein the base station is part [FEATURE ID: 1] of a wireless discrete multitone spread spectrum communications system [FEATURE ID: 1] . 6 . The highly bandwidth - efficient communications method of claim 1 , wherein a time of arrival of the error signal at the base station is used to derive the correction value . 7 . The highly bandwidth - efficient communications method of claim 1 , wherein a phase [FEATURE ID: 3]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US6567383B1 Filed: 1998-02-18 Issued: 2003-05-20 Patent Holder: (Original Assignee) Sony International Europe GmbH     (Current Assignee) Sony Deutschland GmbH Inventor(s): Ralf Böhnke Title: Header structure for TDD systems
[FEATURE ID: 1] compatible base station, transmitter, compatible mobile station, receiver	transceiver, station, terminal, user, network, technology, communication	[FEATURE ID: 1] system, mobile station, correlation technique
[TRANSITIVE ID: 2] uses	has, shares, spans, comprises, includes	[TRANSITIVE ID: 2] occupies
[FEATURE ID: 3] subcarriers, time slots, first pilots, beam, respective cell, frequency, channel estimates	symbol, channels, data, tones, time, signals, samples	[FEATURE ID: 3] frames, single time slot, symbols, frequency
[FEATURE ID: 4] frequency domain, time domain	sequence, channel, symbol, time, frame, frequency, code	[FEATURE ID: 4] time divisional duplex, repeated, structure, time synchronization
[TRANSITIVE ID: 5] comprising, are, includes	including, having, of, has, include, with, the	[TRANSITIVE ID: 5] comprising, comprises, have
[FEATURE ID: 6] antennas	terminals, transmitters, users, receivers	[FEATURE ID: 6] mobile stations
[FEATURE ID: 7] cell, second pilots	location, network, information, data, control, pilot, cells	[FEATURE ID: 7] cell
[FEATURE ID: 8] specific pilots	specific, designated, identified, defined	[FEATURE ID: 8] selected
[FEATURE ID: 9] data, second type, specific information	information, synchronization, cell, system data, first, second, broadcast data	[FEATURE ID: 9] data, synchronization data, general broadcast channel
[FEATURE ID: 10] claim	item, embodiment, step, preceding claim, claimed, statement, feature	[FEATURE ID: 10] claim
[FEATURE ID: 11] method	procedure, radio method, transmission, process	[FEATURE ID: 11] Wireless transmission method
[FEATURE ID: 12] same time	time, same, bandwidth, duration, periodicity	[FEATURE ID: 12] same time duration
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses [TRANSITIVE ID: 2] subcarriers [FEATURE ID: 3] in a frequency domain [FEATURE ID: 4] and time slots [FEATURE ID: 3] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 5] : a plurality of antennas [FEATURE ID: 6] ; and a transmitter [FEATURE ID: 1] operably coupled to the plurality of antennas ; the transmitter configured to : insert first pilots [FEATURE ID: 3] of a first type onto a first plurality of subcarriers , wherein the first pilots are [TRANSITIVE ID: 5] cell [FEATURE ID: 7] - specific pilots [FEATURE ID: 8] ; and insert data [FEATURE ID: 9] and second pilots [FEATURE ID: 7] of a second type [FEATURE ID: 9] onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 3] - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 10] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 5] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell [FEATURE ID: 3] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 3] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 9] . 8 . A method [FEATURE ID: 11] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 1] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver [FEATURE ID: 1] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 3] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 12]		1 . Wireless transmission method [FEATURE ID: 11] , comprising [TRANSITIVE ID: 5] the step of : transmitting data [FEATURE ID: 9] in frames [FEATURE ID: 3] according to a time divisional duplex [FEATURE ID: 4] ( TDD ) system [FEATURE ID: 1] , wherein frame comprises [TRANSITIVE ID: 5] a header slot ( HS ) and a plurality of traffic slots ( TS ) , wherein the header slot ( HS ) and the individual traffic slots ( TS ) have [TRANSITIVE ID: 5] the same time duration [FEATURE ID: 12] , wherein the header slot ( HS ) occupies [TRANSITIVE ID: 2] a single time slot [FEATURE ID: 3] , and wherein the header slot ( HS ) is subdivided into : a downlink channel ( DC ) for the transmission of synchronization data [FEATURE ID: 9] ( SYNCH ) and system data from a base station ( 1 ) to at least one mobile station [FEATURE ID: 1] ( 2 , 3 , 4 ) , and an uplink channel ( UC ) for the transmission of registration data ( RACH ) from at least one mobile station ( 3 ) to the base station ( 1 ) . 2 . Wireless transmission method according to claim [FEATURE ID: 10] 1 , characterized in that the downlink channel ( DC ) and the uplink channel ( UC ) of the header slot ( HS ) have the same time duration . 3 . Wireless transmission method according to claim 1 , characterized in that the downlink channel ( DC ) of the header slot ( HS ) comprises a synchronization channel ( SYNCH ) and at least one broadcast channel ( GBCCH , OBCCH ) for the transmission of cell [FEATURE ID: 7] and / or system data to all or selected [TRANSITIVE ID: 8] mobile stations [FEATURE ID: 6] ( 2 , 3 , 4 ) . 4 . Wireless transmission method , comprising the step of : transmitting data in frames according to a time divisional duplex ( TDD ) system , wherein each frame comprises a header slot ( HS ) and a plurality of traffic slots ( TS ) , wherein the header slot ( HS ) and the individual traffic slots ( TS ) have the same time duration , wherein the header slot ( HS ) occupies a single time slot , wherein the header slot ( HS ) is subdivided into : a downlink channel ( DC ) for the transmission of synchronization data ( SYNCH ) and system data from a base station ( 1 ) to at least one mobile station ( 2 , 3 , 4 ) , and an uplink channel ( UC ) for the transmission of registration data ( RACH ) from at least one mobile station ( 3 ) to the base station ( 1 ) , wherein the downlink channel ( DC ) of the header slot ( HS ) comprises a synchronization channel ( SYNCH ) and at least one broadcast channel ( GBCCH , OBCCH ) for the transmission of cell and / or system data to all or selected mobile stations ( 2 , 3 , 4 ) , and wherein the synchronization channel ( SYNCH ) of the header slot ( HS ) comprises at least two identical repeated [TRANSITIVE ID: 4] symbols [FEATURE ID: 3] ( S 1 , S 2 ) . 5 . Wireless transmission method , comprising the step of : transmitting data in frames according to a time divisional duplex ( TDD ) system , wherein each frame comprises a header slot ( HS ) and a plurality of traffic slots ( TS ) , wherein the header slot ( HS ) and the individual traffic slots ( TS ) have the same time duration , wherein the header slot ( HS ) occupies a single time slot , wherein the header slot ( HS ) is subdivided into : a downlink channel ( DC ) for the transmission of synchronization data ( SYNCH ) and system data from a base station ( 1 ) to at least one mobile station ( 2 , 3 , 4 ) , and an uplink channel ( UC ) for the transmission of registration data ( RACH ) from at least one mobile station ( 3 ) to the base station ( 1 ) , wherein the downlink channel ( DC ) of the header slot ( HS ) comprises a synchronization channel ( SYNCH ) and at least one broadcast channel ( GBCCH , OBCCH ) for the transmission of cell and / or system data to all or selected mobile stations ( 2 , 3 , 4 ) , and wherein the at least one broadcast channel ( GBCCH , OBCCH ) of the header slot ( HS ) comprises at least two identical repeated symbols . 6 . Wireless transmission method according to claim 4 , characterized in that a repeated structure [FEATURE ID: 4] of the synchronization channel ( SYNCH ) and / or the broadcast channel ( GBCCH , OBCCH ) of the header slot ( HS ) is used for a frequency [FEATURE ID: 3] and / or time synchronization [FEATURE ID: 4] by means of a correlation technique [FEATURE ID: 1] ( 5 , 6 ) . 7 . Wireless transmission method , comprising the step of : transmitting data in frames according to a time divisional duplex ( TDD ) system , wherein each frame comprises a header slot ( HS ) and a plurality of traffic slots ( TS ) , wherein the header slot ( HS ) and the individual traffic slots ( TS ) have the same time duration , wherein the header slot ( HS ) occupies a single time slot , wherein the header slot ( HS ) is subdivided into : a downlink channel ( DC ) for the transmission of synchronization data ( SYNCH ) and system data from a base station ( 1 ) to at least one mobile station ( 2 , 3 , 4 ) , and an uplink channel ( UC ) for the transmission of registration data ( RACH ) from at least one mobile station ( 3 ) to the base station ( 1 ) , wherein the downlink channel ( DC ) of the header slot ( HS ) comprises a synchronization channel ( SYNCH ) and at least one broadcast channel ( GBCCH , OBCCH ) for the transmission of cell and / or system data to all or selected mobile stations ( 2 , 3 , 4 ) , wherein a general broadcast channel [FEATURE ID: 9]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20030081538A1 Filed: 2001-10-18 Issued: 2003-05-01 Patent Holder: (Original Assignee) Qualcomm Inc     (Current Assignee) Qualcomm Inc Inventor(s): Jay Walton, John Ketchum, Steven Howard, Mark Wallace Title: Multiple-access hybrid OFDM-CDMA system
[FEATURE ID: 1] orthogonal frequency division multiple access, respective cell	frequency, antenna, of, orthogonal, sector, carrier, channel	[FEATURE ID: 1] access OFDM, communication channel
[FEATURE ID: 2] compatible base station, transmitter, method, compatible mobile station	communication, transceiver, receiver, wireless, scheme, technology, device	[FEATURE ID: 2] CDMA system, method, wireless communication channel
[FEATURE ID: 3] subcarriers, antennas, specific information, channel estimates	tones, signals, symbols, data, values, pilots, frames	[FEATURE ID: 3] frequency domain, codes, spread data, particular transformation, OFDM symbols, transmission symbols, cover code, bits, modulation symbols
[FEATURE ID: 4] frequency domain, second pilots, beam	sequence, channel, code, packet, signal, pilot, symbol	[FEATURE ID: 4] multiple, data stream, data symbol stream, cyclic prefix, OFDM symbol, transmission symbol, length, particular modulation scheme
[FEATURE ID: 5] time slots, first pilots	samples, data, tones, signals, channels, codes, pilots	[FEATURE ID: 5] data symbols, orthogonal codes
[FEATURE ID: 6] time domain	code, format, protocol, sequence	[FEATURE ID: 6] scheme
[TRANSITIVE ID: 7] comprising, includes	including, comprises, of, with, include, implementing, has	[TRANSITIVE ID: 7] comprising
[TRANSITIVE ID: 8] coupled	associated, linked, related, responsive	[TRANSITIVE ID: 8] assigned
[TRANSITIVE ID: 9] are	include, encode, define, represent	[TRANSITIVE ID: 9] provide
[FEATURE ID: 10] specific pilots, unique	associated, designated, common, defined, specific, applicable, particular	[FEATURE ID: 10] selected, available
[FEATURE ID: 11] data	payload, null, preamble, pilots, channel	[FEATURE ID: 11] pilot
[FEATURE ID: 12] claim	figure, preceding claim, feature, embodiment, paragraph, item, clair	[FEATURE ID: 12] claim
[FEATURE ID: 13] specific pilot	set, corresponding, group, number, code	[FEATURE ID: 13] stream
[FEATURE ID: 14] frequency	order, sequence, use, parallel	[FEATURE ID: 14] accordance
[FEATURE ID: 15] same time	level, rank, resolution, bandwidth, power	[FEATURE ID: 15] particular gain
1 . An orthogonal frequency division multiple access [FEATURE ID: 1] ( OFDMA ) - compatible base station [FEATURE ID: 2] that uses subcarriers [FEATURE ID: 3] in a frequency domain [FEATURE ID: 4] and time slots [FEATURE ID: 5] in a time domain [FEATURE ID: 6] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 7] : a plurality of antennas [FEATURE ID: 3] ; and a transmitter [FEATURE ID: 2] operably coupled [TRANSITIVE ID: 8] to the plurality of antennas ; the transmitter configured to : insert first pilots [FEATURE ID: 5] of a first type onto a first plurality of subcarriers , wherein the first pilots are [TRANSITIVE ID: 9] cell - specific pilots [FEATURE ID: 10] ; and insert data [FEATURE ID: 11] and second pilots [FEATURE ID: 4] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 4] - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 12] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 7] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 13] of the cell - specific pilots is unique [FEATURE ID: 10] to a respective cell [FEATURE ID: 1] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 14] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 3] . 8 . A method [FEATURE ID: 2] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 2] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 3] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 15]		1 . In a multiple [FEATURE ID: 4] - access OFDM [FEATURE ID: 1] - CDMA system [FEATURE ID: 2] , a method [FEATURE ID: 2] for processing data for transmission over a wireless communication channel [FEATURE ID: 2] , comprising [TRANSITIVE ID: 7] : coding a data stream [FEATURE ID: 4] in accordance [FEATURE ID: 14] with a particular coding scheme [FEATURE ID: 6] to provide [TRANSITIVE ID: 9] a stream [FEATURE ID: 13] of data symbols [FEATURE ID: 5] ; spreading the data symbol stream [FEATURE ID: 4] in a frequency domain [FEATURE ID: 3] with one or more spreading codes [FEATURE ID: 3] to provide spread data [FEATURE ID: 3] , wherein the one or more spreading codes are selected [TRANSITIVE ID: 10] from a set of available [FEATURE ID: 10] spreading codes and assigned [TRANSITIVE ID: 8] to the data stream ; transforming the spread data in accordance with a particular transformation [FEATURE ID: 3] to provide a stream of OFDM symbols [FEATURE ID: 3] ; scaling the stream of OFDM symbols in accordance with a particular gain [FEATURE ID: 15] selected for the data stream ; and transmitting the scaled OFDM symbols over the communication channel [FEATURE ID: 1] . 2 . The method of claim [FEATURE ID: 12] 1 , further comprising : appending a cyclic prefix [FEATURE ID: 4] to each OFDM symbol [FEATURE ID: 4] to provide a corresponding transmission symbol [FEATURE ID: 4] , wherein transmission symbols [FEATURE ID: 3] are scaled and transmitted over the communication channel . 3 . The method of claim 1 , further comprising : covering the scaled OFDM symbols with a cover code [FEATURE ID: 3] . 4 . The method of claim 3 , wherein the cover code has a length [FEATURE ID: 4] that is multiple integer times a length of the OFDM symbol . 5 . The method of claim 3 , wherein the cover code has a length that is multiple integer times a length of a transmission symbol formed by appending a cyclic prefix to an OFDM symbol . 6 . The method of claim 1 , wherein the data symbol stream comprises coded bits [FEATURE ID: 3] . 7 . The method of claim 1 , wherein the data symbol stream comprises modulation symbols [FEATURE ID: 3] derived based on a particular modulation scheme [FEATURE ID: 4] . 8 . The method of claim 1 , further comprising : transmitting a pilot [FEATURE ID: 11] along with the scaled OFDM symbols over the communication channel . 9 . The method of claim 1 , wherein the spreading codes are Walsh codes . 10 . The method of claim 1 , wherein the spreading codes are orthogonal codes [FEATURE ID: 5]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20030072255A1 Filed: 2001-10-17 Issued: 2003-04-17 Patent Holder: (Original Assignee) Nortel Networks Ltd     (Current Assignee) Apple Inc Inventor(s): Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong Title: System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design
[FEATURE ID: 1] compatible base station, transmitter, respective cell, compatible mobile station	station, transceiver, receiver, system, capable, device, communication	[FEATURE ID: 1] OFDM transmitter
[FEATURE ID: 2] subcarriers, time slots, antennas, second pilots, beam, frequency, further, channel estimates	signals, slots, data, channels, pilot, tones, transmissions	[FEATURE ID: 2] sub-carriers, header OFDM symbol, antennas, N sub-carriers, header symbols, dedicated pilot channel, common synchronization channel, header OFDM symbols, broadcasting sub-carriers, identical OFDM symbols, pilot channel sub-carriers
[FEATURE ID: 3] frequency domain	symbol, signal, channel, sequence, burst, header, format	[FEATURE ID: 3] MIMO, header symbol format, transmitter, different set, preamble, BTS specific, complex sequence
[FEATURE ID: 4] time domain, cell, antenna	symbol, beam, channel, duration, carrier, user, bandwidth	[FEATURE ID: 4] antenna, header OFDM symbol format
[TRANSITIVE ID: 5] coupled, configured	arranged, connected, used, disposed, related, implemented, provided	[TRANSITIVE ID: 5] adapted, assigned
[TRANSITIVE ID: 6] insert, includes	include, have, provide, incorporate, contains, has, encode	[TRANSITIVE ID: 6] contain
[FEATURE ID: 7] first pilots	symbols, pilots, carriers, tones	[FEATURE ID: 7] common synchronization channel sub-carriers
[TRANSITIVE ID: 8] are, transmit	use, provide, broadcast, output, modulate, have, emit	[TRANSITIVE ID: 8] transmit
[FEATURE ID: 9] specific pilots	dedicated, defined, unique, specific, selected, differing, transmitted	[FEATURE ID: 9] separated, multiplexed, different
[FEATURE ID: 10] data	preamble, payload, common, broadcast channel, pilot, overhead, synchronization	[FEATURE ID: 10] dedicated pilot channel sub-carriers, pilot channel
[FEATURE ID: 11] claim	any, clair, preceding claim, either claim, figure, clam, paragraph	[FEATURE ID: 11] claim
[FEATURE ID: 12] specific pilot	set, subset, group, number, series, plurality, collection	[FEATURE ID: 12] non-contiguous set, respective set
[FEATURE ID: 13] unique	synchronized, associated, common, corresponding	[FEATURE ID: 13] respective
[FEATURE ID: 14] specific information	pilots, identification, synchronization, data	[FEATURE ID: 14] efficient BTS identification
[FEATURE ID: 15] same time	subframe, period, symbol, duration	[FEATURE ID: 15] prefix
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses subcarriers [FEATURE ID: 2] in a frequency domain [FEATURE ID: 3] and time slots [FEATURE ID: 2] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising : a plurality of antennas [FEATURE ID: 2] ; and a transmitter [FEATURE ID: 1] operably coupled [TRANSITIVE ID: 5] to the plurality of antennas ; the transmitter configured [TRANSITIVE ID: 5] to : insert [TRANSITIVE ID: 6] first pilots [FEATURE ID: 7] of a first type onto a first plurality of subcarriers , wherein the first pilots are [TRANSITIVE ID: 8] cell [FEATURE ID: 4] - specific pilots [FEATURE ID: 9] ; and insert data [FEATURE ID: 10] and second pilots [FEATURE ID: 2] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 2] - formed ; and the plurality of antennas configured to transmit [TRANSITIVE ID: 8] the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 11] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 6] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 12] of the cell - specific pilots is unique [FEATURE ID: 13] to a respective cell [FEATURE ID: 1] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 2] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 14] . 8 . A method performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 1] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna [FEATURE ID: 4] ; and a receiver ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further [FEATURE ID: 2] configured to : recover the data using channel estimates [FEATURE ID: 2] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 15]		1 . A MIMO [FEATURE ID: 3] - OFDM transmitter [FEATURE ID: 1] adapted [TRANSITIVE ID: 5] to transmit [TRANSITIVE ID: 8] a header symbol format [FEATURE ID: 3] in which sub-carriers [FEATURE ID: 2] of a header OFDM symbol [FEATURE ID: 2] are divided into a non-contiguous set [FEATURE ID: 12] of sub-carriers for each of a plurality of antennas [FEATURE ID: 2] , with each antenna [FEATURE ID: 4] transmitting the header OFDM symbol only on the respective set [FEATURE ID: 12] of sub-carriers . 2 . A transmitter [FEATURE ID: 3] according to claim [FEATURE ID: 11] 1 wherein there are N antennas and a different set [FEATURE ID: 3] of sub-carriers separated [TRANSITIVE ID: 9] by N sub-carriers [FEATURE ID: 2] is assigned [TRANSITIVE ID: 5] to each of the plurality of antennas . 3 . A transmitter according to claim 1 wherein the header symbols [FEATURE ID: 2] contain [TRANSITIVE ID: 6] a multiplexed [TRANSITIVE ID: 9] dedicated pilot channel [FEATURE ID: 2] on dedicated pilot channel sub-carriers [FEATURE ID: 10] and common synchronization channel [FEATURE ID: 2] on common synchronization channel sub-carriers [FEATURE ID: 7] for each of the plurality of antennas . 4 . A transmitter according to claim 3 wherein the header OFDM symbols [FEATURE ID: 2] further contain multiplexed broadcasting sub-carriers [FEATURE ID: 2] for each of the plurality of antennas . 5 . A transmitter according to claim 1 , adapted to transmit a preamble [FEATURE ID: 3] having a prefix [FEATURE ID: 15] , followed by two identical OFDM symbols [FEATURE ID: 2] having said header OFDM symbol format [FEATURE ID: 4] . 6 . A transmitter according to claim 5 wherein the prefix is a cyclic extension of the two identical OFDM symbols . 7 . A transmitter according to claim 3 wherein the pilot channel sub-carriers [FEATURE ID: 2] have a BTS specific [FEATURE ID: 3] mapped complex sequence [FEATURE ID: 3] allowing efficient BTS identification [FEATURE ID: 14] . 8 . A transmitter according to any one of claims 3 wherein the common synchronization channel is designed for fast and accurate initial acquisition . 9 . A transmitter according to claim 3 wherein the common synchronization channel is used for course synchronization and fine synchronization and the pilot channel [FEATURE ID: 10] is used for fine synchronization . 10 . A transmitter according to claim 3 wherein the common synchronization channel is used to transmit a complex sequence which is different [FEATURE ID: 9] for each transmit antenna of one transmitter , but which is common for respective [FEATURE ID: 13]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US6515960B1 Filed: 1997-08-27 Issued: 2003-02-04 Patent Holder: (Original Assignee) Sony Corp     (Current Assignee) Sony Corp Inventor(s): Takashi Usui, Hisaki Hiraiwa, Takehiro Sugita Title: Radio communication system
[FEATURE ID: 1] orthogonal frequency division multiple access	frequency division, of, orthogonal, fm, the, radio, access	[FEATURE ID: 1] orthogonal frequency division multiplexing, OFDM, TDMA time division multiple access
[FEATURE ID: 2] compatible base station, transmitter, respective cell, compatible mobile station	station, device, system, communication, transceiver, terminal, base station	[FEATURE ID: 2] radio communication system, radio communication control terminal
[TRANSITIVE ID: 3] uses	generates, provides, determines, receives, comprises, assigns, has	[TRANSITIVE ID: 3] includes, radio communication control terminal transmits
[FEATURE ID: 4] subcarriers, frequency, channel estimates, same time	time, symbol, antennas, blocks, carrier, cells, slots	[FEATURE ID: 4] data, symbols, frames, timer means, sub-carriers
[FEATURE ID: 5] frequency domain, data, beam	sequence, signal, preamble, channel, frame, symbol, packet	[FEATURE ID: 5] code sequence, code, frame structure, number, transmission timing, sequence code, Gold code
[FEATURE ID: 6] time slots, specific information	timing, data, signals, synchronization, frames, pilots	[FEATURE ID: 6] radio communication
[FEATURE ID: 7] time domain	sequence, period, signal, code, time, length, delay	[FEATURE ID: 7] code generating, timing, length packet
[TRANSITIVE ID: 8] comprising, includes	including, has, of, comprises, with, providing, employing	[TRANSITIVE ID: 8] comprising
[FEATURE ID: 9] antennas, first pilots	users, transmitters, channels, terminals, symbols, devices, ports	[FEATURE ID: 9] radio communication terminals
[TRANSITIVE ID: 10] configured	used, operated, operable, controlled, enabled	[TRANSITIVE ID: 10] set
[FEATURE ID: 11] second pilots	transmissions, control, information, data	[FEATURE ID: 11] data transmission
[FEATURE ID: 12] claim	figure, fig, feature, embodiment, clam, paragraph, item	[FEATURE ID: 12] claim
[FEATURE ID: 13] specific pilot	one, only, subset, number	[FEATURE ID: 13] symbol
1 . An orthogonal frequency division multiple access [FEATURE ID: 1] ( OFDMA ) - compatible base station [FEATURE ID: 2] that uses [TRANSITIVE ID: 3] subcarriers [FEATURE ID: 4] in a frequency domain [FEATURE ID: 5] and time slots [FEATURE ID: 6] in a time domain [FEATURE ID: 7] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 8] : a plurality of antennas [FEATURE ID: 9] ; and a transmitter [FEATURE ID: 2] operably coupled to the plurality of antennas ; the transmitter configured [TRANSITIVE ID: 10] to : insert first pilots [FEATURE ID: 9] of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and insert data [FEATURE ID: 5] and second pilots [FEATURE ID: 11] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 5] - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 12] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 8] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 13] of the cell - specific pilots is unique to a respective cell [FEATURE ID: 2] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 4] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 6] . 8 . A method performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 2] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 4] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 4]		1 . A radio communication system [FEATURE ID: 2] comprising [TRANSITIVE ID: 8] : a plurality of radio communication terminals [FEATURE ID: 9] for data communication ; and a radio communication control terminal [FEATURE ID: 2] for controlling radio communication [FEATURE ID: 6] , wherein said radio communication control terminal includes [TRANSITIVE ID: 3] first transmission means for performing data transmission [FEATURE ID: 11] by orthogonal frequency division multiplexing [FEATURE ID: 1] ( OFDM [FEATURE ID: 1] ) , first receiving means for receiving said data transmission by said OFDM , and synchronization - code generating [FEATURE ID: 7] means for generating a code sequence [FEATURE ID: 5] for synchronization acquisition , and wherein each of said plurality of radio communication terminals includes second transmission means for performing said data transmission by said OFDM , second receiving means for receiving said data transmission by said OFDM , synchronization - code [FEATURE ID: 5] detecting means for detecting said code sequence for said synchronization acquisition , and timer means set [TRANSITIVE ID: 10] by said synchronization - code detecting means , wherein data [FEATURE ID: 4] is modulated by said OFDM and multiplexed by TDMA time division multiple access [FEATURE ID: 1] ( TDMA ) with a frame structure [FEATURE ID: 5] having a specified number [FEATURE ID: 5] of symbols [FEATURE ID: 4] between each of said plurality of radio communication terminals and said radio communication control terminal , said radio communication control terminal transmits [FEATURE ID: 3] said code sequence for said synchronization acquisition to said plurality of radio communication terminals in each of a plurality of frames [FEATURE ID: 4] , and each of said plurality of radio communication terminals receives said code sequence for said synchronization acquisition , compares said code sequence to a predetermined code , sets said timer means [FEATURE ID: 4] according to a receiving timing [FEATURE ID: 7] of said code sequence for said synchronization acquisition , and sets a transmission timing [FEATURE ID: 5] and said receiving timing with said timer means used as a reference . 2 . The radio communication system as set forth in claim [FEATURE ID: 12] 1 , wherein said code sequence for said synchronization acquisition corresponds to one symbol [FEATURE ID: 13] of said specified number of symbols in said OFDM . 3 . The radio communication system as set forth in claim 1 , wherein said code sequence for said synchronization acquisition is a variable - length packet [FEATURE ID: 7] . 4 . The radio communication system as set forth in claim 1 , wherein said code sequence for said synchronization acquisition is an M - sequence code [FEATURE ID: 5] . 5 . The radio communication system as set forth in claim 1 , wherein said code sequence for said synchronization acquisition is a Gold code [FEATURE ID: 5] . 6 . The radio communication system as set forth in claim 1 , wherein each of a plurality of sub-carriers [FEATURE ID: 4]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20020176485A1 Filed: 2001-04-03 Issued: 2002-11-28 Patent Holder: (Original Assignee) Nortel Networks Ltd     (Current Assignee) Nortel Networks Ltd Inventor(s): John Hudson Title: Multi-cast communication system and method of estimating channel impulse responses therein
[FEATURE ID: 1] compatible base station, cell	network, user, transceiver, terminal, system, device, channel	[FEATURE ID: 1] communication device
[FEATURE ID: 2] subcarriers, time slots, data, same time	channels, signals, tones, components, pilots, symbols, beams	[FEATURE ID: 2] signal sequence, training sequence frequency bins, training sequence bursts, training sequences, elements, multiple elements, matrix operations, stations
[FEATURE ID: 3] frequency domain, beam, frequency	signal, channel, sequence, symbol, space, time, spectrum	[FEATURE ID: 3] replica, burst, composite frequency response, channel impulse response, single element transmitter, cyclic prefix, carrier, multiple training bursts
[FEATURE ID: 4] time domain	signal, slot, transmission, carrier, network	[FEATURE ID: 4] channel
[TRANSITIVE ID: 5] comprising, includes	providing, including, of, comprises, defining, having, implementing	[TRANSITIVE ID: 5] comprising, performing, being
[FEATURE ID: 6] antennas, first pilots	users, transmitters, symbols, inputs, receivers, elements, taps	[FEATURE ID: 6] channels
[FEATURE ID: 7] transmitter	controller, memory, device, receiver, transceiver	[FEATURE ID: 7] frequency domain
[TRANSITIVE ID: 8] are	include, identify, have, provide, form, define, represent	[TRANSITIVE ID: 8] generate
[FEATURE ID: 9] second pilots	signals, channels, noise, data	[FEATURE ID: 9] channel impulse response H
[FEATURE ID: 10] claim	item, embodiment, step, preceding claim, claimed, statement, feature	[FEATURE ID: 10] claim
[FEATURE ID: 11] specific pilot	set, corresponding, group, number	[FEATURE ID: 11] multiplicity
[FEATURE ID: 12] respective cell	group, station, device, sector, beam	[FEATURE ID: 12] antenna
[FEATURE ID: 13] specific information	information, measurements, signals, parameters, identities	[FEATURE ID: 13] channel impulse responses
[FEATURE ID: 14] method, compatible mobile station	scheme, device, procedure, processing method, system, technology, first method	[FEATURE ID: 14] method
[FEATURE ID: 15] receiver	demodulator, controller, decoder, transmitter	[FEATURE ID: 15] time domain
[FEATURE ID: 16] channel estimates	information, estimates, components, elements, values	[FEATURE ID: 16] solvable linear equations
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses subcarriers [FEATURE ID: 2] in a frequency domain [FEATURE ID: 3] and time slots [FEATURE ID: 2] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 5] : a plurality of antennas [FEATURE ID: 6] ; and a transmitter [FEATURE ID: 7] operably coupled to the plurality of antennas ; the transmitter configured to : insert first pilots [FEATURE ID: 6] of a first type onto a first plurality of subcarriers , wherein the first pilots are [TRANSITIVE ID: 8] cell [FEATURE ID: 1] - specific pilots ; and insert data [FEATURE ID: 2] and second pilots [FEATURE ID: 9] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 3] - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 10] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 5] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 11] of the cell - specific pilots is unique to a respective cell [FEATURE ID: 12] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 3] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 13] . 8 . A method [FEATURE ID: 14] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 14] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver [FEATURE ID: 15] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 16] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 2]		1 . A method [FEATURE ID: 14] of determining channel impulse responses [FEATURE ID: 13] of a plurality of channels [FEATURE ID: 6] to a communication device [FEATURE ID: 1] , the method comprising [TRANSITIVE ID: 5] : performing [TRANSITIVE ID: 5] transform operations on both a replica [FEATURE ID: 3] of a signal sequence [FEATURE ID: 2] s n and a received training sequence y n received by the communication device in at least one burst [FEATURE ID: 3] , the received training sequence y n being [TRANSITIVE ID: 5] the signal sequence as received through a channel [FEATURE ID: 4] , the transform operations arranged to generate [TRANSITIVE ID: 8] a multiplicity [FEATURE ID: 11] of signal sequence frequency bins and a multiplicity of training sequence frequency bins [FEATURE ID: 2] ; performing point - by - point operations between corresponding signal sequence frequency bins and training sequence frequency bins ; and concatenating the point - by - point operations associated with the channel to provide a composite frequency response [FEATURE ID: 3] for the channel , the composite frequency response allowing , in the time domain [FEATURE ID: 15] , generation of the channel impulse response [FEATURE ID: 3] for the channel . 2 . The method according to claim [FEATURE ID: 10] 1 , further comprising : separating training sequence bursts [FEATURE ID: 2] emanating from a single element transmitter [FEATURE ID: 3] by one of a cyclic prefix [FEATURE ID: 3] and a blank ( zero ) carrier [FEATURE ID: 3] . 3 . The method according to claim 1 , wherein multiple Steiner codes are transmitted as training sequences [FEATURE ID: 2] , the multiple Steiner codes sent from multiple transmit elements [FEATURE ID: 2] in multiple training bursts [FEATURE ID: 3] . 4 . The method according to claim 3 , wherein the multiple Steiner codes are transmitted from multiple elements [FEATURE ID: 2] of a base station transmit antenna [FEATURE ID: 12] . 5 . The method according to claim 1 , further comprising using a set of matrix operations [FEATURE ID: 2] in the frequency domain [FEATURE ID: 7] to resolve channels to the communication device from multiple transmitting stations [FEATURE ID: 2] , the matrix operations providing solvable linear equations [FEATURE ID: 16] for the channel impulse response H [FEATURE ID: 9]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US6480558B1 Filed: 1999-03-17 Issued: 2002-11-12 Patent Holder: (Original Assignee) Ericsson Inc     (Current Assignee) Ericsson Inc ; Optis Wireless Technology LLC ; Cluster LLC Inventor(s): Tony Ottosson, Yi-Pin Eric Wang Title: Synchronization and cell search methods and apparatus for wireless communications
[FEATURE ID: 1] compatible base station, transmitter, cell, frequency, compatible mobile station	transceiver, network, station, device, receiver, system, user	[FEATURE ID: 1] wireless communications system, terminal, traffic channel, communications medium
[FEATURE ID: 2] subcarriers, time slots, antennas, first pilots, second pilots, specific information	signals, channels, data, carriers, codes, resources, symbols	[FEATURE ID: 2] cells, synchronization signals, channel, synchronization code, candidate cells, pilot channel
[FEATURE ID: 3] frequency domain, beam	channel, sequence, symbol, frame, code, waveform, carrier	[FEATURE ID: 3] common synchronization code, signal, synchronization signal, time interval, representation, cell, communications signal, respective synchronization signal, portion, common synchronization signal
[FEATURE ID: 4] time domain, channel estimates, same time	time, power, carrier, duration, transmission, position, source	[FEATURE ID: 4] combination, timing
[TRANSITIVE ID: 5] comprising, includes	of, comprises, having, involving, employing, incorporating, with	[TRANSITIVE ID: 5] including, representing, comprising
[FEATURE ID: 6] specific pilots, formed, unique	associated, configured, directed, transmitted, defined, specific, correlated	[FEATURE ID: 6] encoded
[FEATURE ID: 7] data	common, signal, traffic, information	[FEATURE ID: 7] communications
[FEATURE ID: 8] claim	any, clair, preceding claim, feature, figure, embodiment, paragraph	[FEATURE ID: 8] claim
[FEATURE ID: 9] respective cell	receiver, cell, system, slot	[FEATURE ID: 9] sleep mode
[FEATURE ID: 10] method	process, computerized method, first method, corresponding method, procedure, technique, methodology	[FEATURE ID: 10] method
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses subcarriers [FEATURE ID: 2] in a frequency domain [FEATURE ID: 3] and time slots [FEATURE ID: 2] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 5] : a plurality of antennas [FEATURE ID: 2] ; and a transmitter [FEATURE ID: 1] operably coupled to the plurality of antennas ; the transmitter configured to : insert first pilots [FEATURE ID: 2] of a first type onto a first plurality of subcarriers , wherein the first pilots are cell [FEATURE ID: 1] - specific pilots [FEATURE ID: 6] ; and insert data [FEATURE ID: 7] and second pilots [FEATURE ID: 2] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 3] - formed [TRANSITIVE ID: 6] ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 8] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 5] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot of the cell - specific pilots is unique [FEATURE ID: 6] to a respective cell [FEATURE ID: 9] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 1] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 2] . 8 . A method [FEATURE ID: 10] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 1] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 4] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 4]		1 . In a wireless communications system [FEATURE ID: 1] including [TRANSITIVE ID: 5] a plurality of cells [FEATURE ID: 2] in which synchronization signals [FEATURE ID: 2] transmitted in the cells are encoded [TRANSITIVE ID: 6] according to a common synchronization code [FEATURE ID: 3] , a method [FEATURE ID: 10] of processing a received communications [FEATURE ID: 7] signal [TRANSITIVE ID: 3] representing [TRANSITIVE ID: 5] a combination [FEATURE ID: 4] of synchronization signals comprising [TRANSITIVE ID: 5] the steps of : correlating the received communications signal with the common synchronization code to produce a synchronization detection signal ; canceling a component of the synchronization detection signal associated with a known synchronization signal [FEATURE ID: 3] from the synchronization detection signal to produce an interference - canceled synchronization detection signal ; and determining timing [FEATURE ID: 4] of a synchronization signal from the interference - canceled synchronization detection signal . 2 . A method according to claim [FEATURE ID: 8] 1 : wherein said step of canceling comprises the steps of : generating a correlation of an estimated received known synchronization signal with the common synchronization code ; and canceling the correlation of the estimated received known synchronization signal with the common synchronization code from the synchronization detection signal to produce the interference - canceled synchronization detection signal ; and wherein said step of determining timing comprises the steps of : accumulating the interference - canceled synchronization detection signal over a time interval [FEATURE ID: 3] ; detecting a peak in the accumulated interference - canceled synchronization detection signal ; and determining timing of a synchronization signal from the detected peak . 3 . A method according to claim 2 , wherein said step of generating a correlation of an estimated received known synchronization signal with the common synchronization code comprises the steps of : filtering a representation [FEATURE ID: 3] of the known synchronization signal with an estimate of a channel [FEATURE ID: 2] over which the known synchronization signal is transmitted to produce an estimated received known synchronization signal ; and correlating the estimated received known synchronization signal with the synchronization code [FEATURE ID: 2] . 4 . A method according to claim 1 : wherein said step of canceling comprises the steps of : accumulating the synchronization detection signal over a time interval ; and identifying a peak in the accumulated synchronization detection signal not associated with a known synchronization signal ; and wherein said step of determining timing comprises the step of determining timing of a synchronization signal from the identified peak . 5 . A method according to claim 4 , wherein said step of identifying a peak comprises the step of identifying a peak in the accumulated synchronization detection signal not associated with a known synchronization signal and meeting a predetermined criterion . 6 . A method according to claim 4 : wherein said step of identifying a peak comprises the steps of : identifying a plurality of peaks in the accumulated synchronization detection signal not associated with a known synchronization signal ; and selecting a peak of the plurality of peaks according to a selection criterion ; and wherein said step of determining timing comprises the step of determining timing of a synchronization signal from the selected peak . 7 . A method according to claim 1 , wherein the known synchronization signal comprises a synchronization signal associated with a previously identified cell [FEATURE ID: 3] . 8 . A method according to claim 7 , wherein the known synchronization signal comprises a synchronization signal associated with a cell with which the terminal [FEATURE ID: 1] is currently communicating over a traffic channel [FEATURE ID: 1] . 9 . A method according to claim 7 : wherein said step of canceling is preceded by the step of identifying a set of synchronization signals associated with a set of candidate cells [FEATURE ID: 2] ; and wherein said step of canceling comprises the step of canceling a component of the synchronization detection signal corresponding to a synchronization signal associated with a cell of the set of candidate cells from the synchronization detection signal to produce an interference - canceled synchronization detection signal . 10 . A method according to claim 9 , wherein said step of identifying a set of known synchronization signals comprises the steps of : receiving a communications signal [FEATURE ID: 3] from the communications medium [FEATURE ID: 1] ; identifying a synchronization signal in the received communications signal ; identifying a cell with which the identified synchronization signal is associated ; and adding the identified cell to the set of candidate cells if the identified synchronization signal associated with the identified cell meets a predetermined criterion . 11 . A method according to claim 1 , wherein a respective synchronization signal [FEATURE ID: 3] includes a portion [FEATURE ID: 3] encoded according to the common synchronization code . 12 . A method according to claim 1 , wherein a common synchronization signal [FEATURE ID: 3] is transmitted in each of the cells over a pilot channel [FEATURE ID: 2] . 13 . A method according to claim 1 , wherein said steps of correlating , canceling and determining are performed in response to the terminal awakening from a sleep mode [FEATURE ID: 9]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20020159422A1 Filed: 2001-03-09 Issued: 2002-10-31 Patent Holder: (Original Assignee) Broadstorm Telecommunications Inc     (Current Assignee) J & K SERVICES LLC ; SDR HOLDINGS LLC ; Adaptix Inc ; Kaon Systems Inc Inventor(s): Xiaodong Li, Hui Liu, Wenzhong Zhang Title: Communication system using OFDM for one direction and DSSS for another direction
[FEATURE ID: 1] orthogonal frequency division multiple access	of, orthogonal, interferometry, amc, fm, frequency, wireless	[FEATURE ID: 1] orthogonal frequency domain multiplexing, OFDM
[FEATURE ID: 2] compatible base station, cell	network, terminal, transceiver, transmitter, communication, wireless station, receiver	[FEATURE ID: 2] base station, system
[TRANSITIVE ID: 3] uses, includes	provides, has, defines, involves, of, encompasses, indicates	[TRANSITIVE ID: 3] comprises
[FEATURE ID: 4] subcarriers, time slots, first pilots, data, channel estimates	tones, channels, information, symbols, carriers, frames, samples	[FEATURE ID: 4] signals, signals, subscribers, outputs
[FEATURE ID: 5] frequency domain, frequency	spectrum, space, sequence, spectral, bandwidth, symbol, time	[FEATURE ID: 5] sequence spread spectrum
[TRANSITIVE ID: 6] comprising	including, defining, of, containing, with, providing, implementing	[TRANSITIVE ID: 6] comprising, having
[FEATURE ID: 7] antennas	switches, elements, devices, amplifiers, receivers, channels, symbols	[FEATURE ID: 7] modulators
[FEATURE ID: 8] transmitter, antenna, receiver	controller, processor, transceiver, memory, multiplexer, combiner, first	[FEATURE ID: 8] DSSS transmitter, DSSS receiver, second antenna, first switch, second switch, encoder, FEC encoder, modulator
[TRANSITIVE ID: 9] coupled, unique	corresponding, associated, provided, attached, common, mounted, applied	[TRANSITIVE ID: 9] coupled
[TRANSITIVE ID: 10] insert	provide, interleave, encode, transmit, modulate, multiplex, send	[TRANSITIVE ID: 10] output OFDM signals
[FEATURE ID: 11] specific pilots	selected, designated, formed, identified	[FEATURE ID: 11] defined
[FEATURE ID: 12] second pilots	data, signaling, information, signals	[FEATURE ID: 12] DSSS signals
[TRANSITIVE ID: 13] transmit	communicate, signal, receive, provide	[TRANSITIVE ID: 13] couple
[FEATURE ID: 14] claim	item, figure, step, case, preceding claim, claimed, statement	[FEATURE ID: 14] claim
[FEATURE ID: 15] respective cell, compatible mobile station	receiver, terminal, station, handset, device, client, customer	[FEATURE ID: 15] subscriber
[FEATURE ID: 16] method	corresponding method, procedure, processing method, channelization method, system method, wireless method, first method	[FEATURE ID: 16] method
1 . An orthogonal frequency division multiple access [FEATURE ID: 1] ( OFDMA ) - compatible base station [FEATURE ID: 2] that uses [TRANSITIVE ID: 3] subcarriers [FEATURE ID: 4] in a frequency domain [FEATURE ID: 5] and time slots [FEATURE ID: 4] in a time domain , the OFDMA - compatible base station comprising [TRANSITIVE ID: 6] : a plurality of antennas [FEATURE ID: 7] ; and a transmitter [FEATURE ID: 8] operably coupled [TRANSITIVE ID: 9] to the plurality of antennas ; the transmitter configured to : insert [TRANSITIVE ID: 10] first pilots [FEATURE ID: 4] of a first type onto a first plurality of subcarriers , wherein the first pilots are cell [FEATURE ID: 2] - specific pilots [FEATURE ID: 11] ; and insert data [FEATURE ID: 4] and second pilots [FEATURE ID: 12] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the plurality of antennas configured to transmit [TRANSITIVE ID: 13] the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 14] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 3] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot of the cell - specific pilots is unique [FEATURE ID: 9] to a respective cell [FEATURE ID: 15] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 5] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information . 8 . A method [FEATURE ID: 16] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 15] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna [FEATURE ID: 8] ; and a receiver [FEATURE ID: 8] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 4]		1 . A method [FEATURE ID: 16] for communicating with at least one subscriber [FEATURE ID: 15] , the method comprising [TRANSITIVE ID: 6] : transmitting orthogonal frequency domain multiplexing [FEATURE ID: 1] ( OFDM [FEATURE ID: 1] ) signals [TRANSITIVE ID: 4] to the at least one subscriber ; and receiving direct - sequence spread spectrum [FEATURE ID: 5] ( DSSS ) signals [FEATURE ID: 4] from the at least one subscriber . 2 . The method defined [TRANSITIVE ID: 11] in claim [FEATURE ID: 14] 1 wherein receiving the DSSS signals [FEATURE ID: 12] comprises [TRANSITIVE ID: 3] receiving multiple code division multiple access ( CDMA ) signals from a plurality of subscribers [FEATURE ID: 4] . 3 . A method for communicating with a base station [FEATURE ID: 2] , the method comprising : receiving orthogonal frequency domain multiplexing ( OFDM ) signals from the base station ; and transmitting direct - sequence spread spectrum ( DSSS ) signals to the base station . 4 . The method defined in claim 3 wherein transmitting the DSSS signals comprises transmitting multiple code division multiple access ( CDMA ) signals from a plurality of subscribers . 5 . A system [FEATURE ID: 2] comprising : a subscriber having [TRANSITIVE ID: 6] a DSSS transmitter [FEATURE ID: 8] , an OFDM receiver , a first antenna coupled [TRANSITIVE ID: 9] to the DSSS transmitter and the OFDM receiver ; a base station communicably coupled with the subscriber , the base station having a DSSS receiver [FEATURE ID: 8] , an OFDM transmitter , a second antenna [FEATURE ID: 8] coupled to the DSSS receiver and the OFDM transmitter . 6 . The system defined in claim 5 further comprising : a first switch [FEATURE ID: 8] to couple [TRANSITIVE ID: 13] to the DSSS transmitter and the OFDM receiver to the first antenna ; and a second switch [FEATURE ID: 8] to couple to the DSSS receiver and the OFDM transmitter to the second antenna . 7 . The system defined in claim 5 further comprising : a first frequency duplexer to couple to the DSSS transmitter and the OFDM receiver to the first antenna ; and a second frequency duplexer to couple to the DSSS receiver and the OFDM transmitter to the second antenna . 8 . The system defined in claim 5 wherein the OFDM transmitter comprises : a plurality of processing paths , wherein each of the processing paths has a forward error correction ( FEC ) encoder [FEATURE ID: 8] , an interleaver coupled to an output of the FEC encoder [FEATURE ID: 8] , and a modulator [FEATURE ID: 8] coupled to an output of the interleaver ; and an inverse Fast Fourier Transform ( IFFT ) coupled to receive outputs [FEATURE ID: 4] from modulators [FEATURE ID: 7] in the plurality of processing paths and to output OFDM signals [FEATURE ID: 10]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20020141483A1 Filed: 1999-07-28 Issued: 2002-10-03 Patent Holder: (Original Assignee) Individual     (Current Assignee) Intel Corp Inventor(s): Markus Doetsch, Tideya Kella, Peter Schmidt, Peter Jung, Jorg Plechinger, Michael Schneider Title: Method for estimating channel impulse responses of a mobile radio channel
[FEATURE ID: 1] compatible base station, receiver	transceiver, transmitter, network, sector, transmission, radio, system	[FEATURE ID: 1] code division multiple access system, mobile radio receiver, further synchronization channel
[TRANSITIVE ID: 2] uses, includes	provides, encompasses, implements, employs, processes, involves, contains	[TRANSITIVE ID: 2] has, comprises
[FEATURE ID: 3] subcarriers, antennas, frequency, same time	symbols, frames, time, codes, bandwidth, channels, data	[FEATURE ID: 3] sequences, mobile radio receivers, time slot, further sequences, information
[FEATURE ID: 4] frequency domain	reception, channel, time, sequence, signal, symbol, frame	[FEATURE ID: 4] common synchronization channel, case, current pilot symbol sequence, last pilot symbol
[FEATURE ID: 5] time slots	sequences, values, timing, periods, indices, channels, addresses	[FEATURE ID: 5] pilot symbols, points, delay times
[FEATURE ID: 6] time domain	symbol, slot, transmission, period, time, preamble, subframe	[FEATURE ID: 6] pilot symbol sequence, position, previous time slot, current time slot, first pilot symbol
[TRANSITIVE ID: 7] comprising, are	including, with, have, include, providing, has, using	[TRANSITIVE ID: 7] having
[FEATURE ID: 8] transmitter, cell, respective cell, compatible mobile station	device, terminal, receiver, user, transceiver, station, system	[FEATURE ID: 8] downlink mobile radio channel
[TRANSITIVE ID: 9] configured, unique	used, adapted, transmitted, common, allocated, applied, arranged	[TRANSITIVE ID: 9] provided
[FEATURE ID: 10] first pilots, specific information, channel estimates	information, data, pilots, measurements, signals, properties, values	[FEATURE ID: 10] mobile radio channel impulse responses, further symbols
[FEATURE ID: 11] specific pilots	specific, common, unique, fixed, related, defined, dedicated	[FEATURE ID: 11] known
[FEATURE ID: 12] data	control, symbols, pilots, traffic, information	[FEATURE ID: 12] data
[FEATURE ID: 13] second pilots	signals, power, channels, symbols	[FEATURE ID: 13] complex amplitudes
[FEATURE ID: 14] claim	preceding claim, statement, figure, embodiment, paragraph, item, clair	[FEATURE ID: 14] claim
[FEATURE ID: 15] method	methods, process, procedure, methodology, first method, signaling method, radio method	[FEATURE ID: 15] method, steps
[FEATURE ID: 16] further	not, additionally, also, simultaneously, only, jointly, successively	[FEATURE ID: 16] transmitted, buffer
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station [FEATURE ID: 1] that uses [TRANSITIVE ID: 2] subcarriers [FEATURE ID: 3] in a frequency domain [FEATURE ID: 4] and time slots [FEATURE ID: 5] in a time domain [FEATURE ID: 6] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 7] : a plurality of antennas [FEATURE ID: 3] ; and a transmitter [FEATURE ID: 8] operably coupled to the plurality of antennas ; the transmitter configured [TRANSITIVE ID: 9] to : insert first pilots [FEATURE ID: 10] of a first type onto a first plurality of subcarriers , wherein the first pilots are [TRANSITIVE ID: 7] cell [FEATURE ID: 8] - specific pilots [FEATURE ID: 11] ; and insert data [FEATURE ID: 12] and second pilots [FEATURE ID: 13] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 14] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 2] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot of the cell - specific pilots is unique [FEATURE ID: 9] to a respective cell [FEATURE ID: 8] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 3] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 10] . 8 . A method [FEATURE ID: 15] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 8] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver [FEATURE ID: 1] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further [FEATURE ID: 16] configured to : recover the data using channel estimates [FEATURE ID: 10] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 3]		1 . A method [FEATURE ID: 15] for estimating mobile radio channel impulse responses [FEATURE ID: 10] in a downlink mobile radio channel [FEATURE ID: 8] in a code division multiple access system [FEATURE ID: 1] that has [TRANSITIVE ID: 2] a common synchronization channel [FEATURE ID: 4] provided [TRANSITIVE ID: 9] for synchronization of each mobile radio receiver [FEATURE ID: 1] , which comprises [TRANSITIVE ID: 2] the steps [FEATURE ID: 15] of : transmitting , via the common synchronization channel , sequences [FEATURE ID: 3] continuously to a plurality of mobile radio receivers [FEATURE ID: 3] , the sequences being known [TRANSITIVE ID: 11] to each of the mobile radio receivers , the sequences transmitted [TRANSITIVE ID: 16] having [TRANSITIVE ID: 7] pilot symbols [FEATURE ID: 5] for identifying the common synchronization channel , and the pilot symbols being transmitted at points [FEATURE ID: 5] which are known to the mobile radio receivers within a time slot [FEATURE ID: 3] ; and evaluating the pilot symbols in the sequences , known to the mobile radio receivers , to jointly estimate delay times [FEATURE ID: 5] and complex amplitudes [FEATURE ID: 13] of the mobile radio channel impulse responses when searching for and identifying the common synchronization channel . 2 . The method according to claim [FEATURE ID: 14] 1 , which comprises evaluating the pilot symbols while searching for and identifying the common synchronization channel during slot synchronization . 3 . The method according to claim 1 , which comprises : transmitting further sequences [FEATURE ID: 3] , via a further synchronization channel [FEATURE ID: 1] ; and using the further sequences for estimating the delay times and the complex amplitudes of the mobile radio channel impulse responses . 4 . The method according to claim 1 , which comprises estimating the mobile radio channel impulse responses in each case [FEATURE ID: 4] on receiving one of a pilot symbol and a pilot symbol sequence [FEATURE ID: 6] at one of a start of the time slot , an end of the time slot , and any position [FEATURE ID: 6] in the time slot . 5 . The method according to claim 1 , which comprises estimating the mobile radio channel impulse responses by one of prediction and interpolation of one of a previous pilot symbol and a previous pilot symbol sequence received in a previous time slot [FEATURE ID: 6] , and one of a current pilot symbol and a current pilot symbol sequence [FEATURE ID: 4] in a current time slot [FEATURE ID: 6] . 6 . The method according to claim 5 , which comprises using further symbols [FEATURE ID: 10] , which are known in the mobile radio receiver for the prediction or the interpolation . 7 . The method according to claim 5 , which comprises buffer [FEATURE ID: 16] storing data [FEATURE ID: 12] and monitoring information [FEATURE ID: 3] transmitted between a last pilot symbol [FEATURE ID: 4] in the previous time slot and a first pilot symbol [FEATURE ID: 6]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US6434364B1 Filed: 1998-12-24 Issued: 2002-08-13 Patent Holder: (Original Assignee) Telefonaktiebolaget LM Ericsson AB     (Current Assignee) Optis Wireless Technology LLC ; Cluster LLC Inventor(s): Fergal O'Riordain Title: Wireless communication system that supports mobile test software agents
[TRANSITIVE ID: 1] uses, includes	provides, defines, comprises, receives, has, establishes, monitors	[TRANSITIVE ID: 1] originates, identifies
[FEATURE ID: 2] subcarriers	codes, data, cells, slots	[FEATURE ID: 2] capability identifier fields
[FEATURE ID: 3] frequency domain, same time	time, wavelength, cell, bandwidth, carrier, position, symbol	[FEATURE ID: 3] test location
[FEATURE ID: 4] time slots, channel estimates	resources, samples, observations, signals, values, pilots, transmissions	[FEATURE ID: 4] measurements
[TRANSITIVE ID: 5] comprising	including, providing, implementing, of, using, with, incorporating	[TRANSITIVE ID: 5] comprising
[FEATURE ID: 6] transmitter, cell, respective cell	device, processor, server, terminal, receiver, network, scheduler	[FEATURE ID: 6] radio network performance manager, network controller, mobile station, mobile resident application software, location register
[TRANSITIVE ID: 7] coupled, specific pilot	corresponding, associated, unique, particular, set, specific, related	[TRANSITIVE ID: 7] relating
[FEATURE ID: 8] specific pilots, unique	associated, designated, specific, selected, corresponding, relevant, particular	[FEATURE ID: 8] specified, identified
[FEATURE ID: 9] second pilots	information, data, instructions, indicators, commands, preferences, identifier	[FEATURE ID: 9] choice identifier fields, location identifiers, choice identifiers
[TRANSITIVE ID: 10] transmit	utilize, access, use, receive, process	[TRANSITIVE ID: 10] execute
[FEATURE ID: 11] claim	figure, item, par claim, feature, embodiment, clam, paragraph	[FEATURE ID: 11] claim
[FEATURE ID: 12] specific information	reports, signals, parameters, measurements, coverage, messages, instructions	[FEATURE ID: 12] executable mobile test software agents, test system performance information
[FEATURE ID: 13] method	methods, procedure, process, operation, wireless method, corresponding method, system method	[FEATURE ID: 13] method, steps
[FEATURE ID: 14] compatible mobile station	mobile, system, radio network, user, network, server, terminal	[FEATURE ID: 14] communication system, mobile test software agent
1 . An orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses [TRANSITIVE ID: 1] subcarriers [FEATURE ID: 2] in a frequency domain [FEATURE ID: 3] and time slots [FEATURE ID: 4] in a time domain , the OFDMA - compatible base station comprising [TRANSITIVE ID: 5] : a plurality of antennas ; and a transmitter [FEATURE ID: 6] operably coupled [TRANSITIVE ID: 7] to the plurality of antennas ; the transmitter configured to : insert first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell [FEATURE ID: 6] - specific pilots [FEATURE ID: 8] ; and insert data and second pilots [FEATURE ID: 9] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the plurality of antennas configured to transmit [TRANSITIVE ID: 10] the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 11] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 1] an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot [FEATURE ID: 7] of the cell - specific pilots is unique [FEATURE ID: 8] to a respective cell [FEATURE ID: 6] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information [FEATURE ID: 12] . 8 . A method [FEATURE ID: 13] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 14] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further configured to : recover the data using channel estimates [FEATURE ID: 4] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 3]		1 . A communication system [FEATURE ID: 14] , comprising [TRANSITIVE ID: 5] : a radio network performance manager [FEATURE ID: 6] that originates [TRANSITIVE ID: 1] one or more executable mobile test software agents [FEATURE ID: 12] ; mobile stations that can execute [TRANSITIVE ID: 10] the one or more mobile test software agents , for switching their normal operating mode to a test mode ; a network controller [FEATURE ID: 6] that based on location information identifies [TRANSITIVE ID: 1] one or more mobile stations that can execute mobile test software agents at specified [TRANSITIVE ID: 8] test locations and downloads the one or more executable mobile test software agents to the one or more identified [TRANSITIVE ID: 8] mobile stations . 2 . The communication system of claim [FEATURE ID: 11] 1 , wherein the mobile test software agent [FEATURE ID: 14] passes a parameter relating [TRANSITIVE ID: 7] to a specified test to the mobile station [FEATURE ID: 6] . 3 . The communication system of claim 2 , wherein the mobile station is configured to operate in the test mode using the parameter passed by the mobile test software agent . 4 . The communication system of claim 1 , wherein the mobile test software agent is executed at the mobile station by a mobile resident application software [FEATURE ID: 6] . 5 . The communication system of claim 1 , wherein in the test mode , the mobile station takes specified measurements [FEATURE ID: 4] . 6 . The communication system of claim 1 , wherein in the test mode , the mobile station operates in a manner that measurements may be taken by an external resource . 7 . The communication system of claim 1 , wherein the network controller identifies mobile stations for executing mobile test software agents at the test locations based on information stored in a location register [FEATURE ID: 6] . 8 . The communication system of claim 1 , wherein capability identifier fields [FEATURE ID: 2] in a register identify those mobile stations with the capability to execute the mobile test software agents . 9 . The communication system of claim 1 , wherein choice identifier fields [FEATURE ID: 9] in a register indicate whether corresponding mobile stations that execute mobile test software agents should be placed in test mode or not . 10 . The communication system of claim 1 , wherein the mobile test software agent represents an addressable computer program that can be transported across data networks . 11 . The communication system of claim 1 , wherein said mobile stations may choose not to download the mobile test software agents . 12 . The communication system of claim 1 , wherein the downloading of the one or more executable mobile test software agents is postponed until the one or more mobile stations that execute the mobile test software agents are available at the specified test locations . 13 . A method [FEATURE ID: 13] for operating a communication system , comprising the steps [FEATURE ID: 13] of : determining test locations for performing one or more specified tests within the communication system ; originating executable mobile test software agents that configure mobile stations within the communication system to operate in a test mode , for collecting test system performance information [FEATURE ID: 12] ; identifying one or more mobile stations that can execute the one or more mobile test software agents at the test locations ; downloading the originated executable mobile test software agents to the identified one or more mobile stations ; executing the mobile test software agent at the identified one or more mobile stations ; and operating the mobile station in a normal operating mode after the test mode . 14 . The method of claim 13 , wherein the mobile test software agent passes a parameter relating to the specified test to a mobile station . 15 . The method of claim 14 , wherein the mobile station is configured to operate in the test mode using the parameter passed by the mobile test software agent . 16 . The method of claim 13 , wherein the mobile test software agent is executed at the mobile station by a mobile resident application software . 17 . The method of claim 13 , wherein in the test mode , the mobile station takes specified measurements . 18 . The method of claim 13 , wherein in the test mode , the mobile station operates in a manner that measurements may be taken by an external resource . 19 . The method of claim 13 , the mobile stations that execute mobile test software agents at a test location [FEATURE ID: 3] are identified based on information stored in a location register . 20 . The method of claim 13 , wherein mobile test software agent represents an addressable computer program that can be transported across data networks . 21 . The method of claim 13 , wherein capability identifier fields in a register identify those mobile stations with the capability to execute the mobile test software agents . 22 . The method of claim 13 , wherein choice identifier fields in a register indicate whether corresponding mobile stations that execute mobile test software agents should be placed in test mode or not . 23 . The system of method of communication system of claim 13 , wherein the downloading of the one or more executable mobile test software agents is postponed until the one or more mobile stations that execute the mobile test software agents are available at the specified test locations . 24 . The method of communication system of claim 13 , wherein said mobile stations may choose not to download the mobile test software agents . 25 . A method for operating a communication system , comprising the steps of : listing mobile stations capable of executing executable mobile test software agents that configure the mobile stations to operate in a test mode , for collecting test system performance information ; identifying one or more mobile stations that can execute the one or more mobile test software agents at selected test locations based on capability and location identifiers [FEATURE ID: 9] associated with each one of the listed mobile stations ; and downloading the originated executable mobile test software agents to the identified one or more mobile stations based on choice identifiers [FEATURE ID: 9]

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Targeted Patent: Patent: US10965512B2 Filed: 2004-01-29 Issued: 2021-03-30 Patent Holder: (Original Assignee) Neo Wireless LLC     (Current Assignee) Neo Wireless LLC Inventor(s): Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang Title: Method and apparatus using cell-specific and common pilot subcarriers in multi-carrier, multi cell wireless communication networks	Cross Reference / Shared Meaning between the Lines	Charted Against: Patent: US20010021182A1 Filed: 2000-02-29 Issued: 2001-09-13 Patent Holder: (Original Assignee) Toshiba Corp     (Current Assignee) Toshiba Corp Inventor(s): Takashi Wakutsu Title: Transmitter apparatus and receiver apparatus and base station making use of orthogonal frequency division multiplexing and spectrum spreading
[FEATURE ID: 1] orthogonal frequency division multiple access	orthogonal, frequency division, asynchronous, frequency, antenna	[FEATURE ID: 1] orthogonal frequency division
[TRANSITIVE ID: 2] uses	processes, provides, generates, produces, carries, creates, controls	[TRANSITIVE ID: 2] modulates, performs
[FEATURE ID: 3] subcarriers, first pilots, subcarrier, channel estimates	data, carriers, channels, information, frequency, codes, tones	[FEATURE ID: 3] spectrum, information signals, orthogonal frequency division multiplexing, signals, symbols, frequency domain, patterns
[FEATURE ID: 4] frequency domain, time domain, cell, beam, respective cell, compatible mobile station, receiver	channel, symbol, signal, radio, carrier, transmitter, terminal	[FEATURE ID: 4] transmitter apparatus, receiver apparatus, transmission signal, serial data sequence, data
[FEATURE ID: 5] time slots	symbol, data, signals, samples	[FEATURE ID: 5] output data sequence
[TRANSITIVE ID: 6] comprising, includes	including, of, having, involving, featuring, incorporating, with	[TRANSITIVE ID: 6] making, comprising
[FEATURE ID: 7] transmitter	controller, generator, means, processor, switch, device, memory	[FEATURE ID: 7] transmission signal processing circuit, modulator, pattern generation circuit
[FEATURE ID: 8] data	signal, channel, information, synchronization	[FEATURE ID: 8] communication
[FEATURE ID: 9] second pilots	information, power, noise, data	[FEATURE ID: 9] signal level
[FEATURE ID: 10] claim	fig, claimed, clair, item, paragraph, preceding claim, figure	[FEATURE ID: 10] claim
[FEATURE ID: 11] frequency	sequence, series, order, parallel, transmission	[FEATURE ID: 11] combination
[FEATURE ID: 12] method	operation, scheme, communication, technique, process, function, transmission	[FEATURE ID: 12] modulation
[FEATURE ID: 13] further	not, thus, is, being, selectively	[FEATURE ID: 13] been
[FEATURE ID: 14] same time	phase, location, distance, speed	[FEATURE ID: 14] direction
1 . An orthogonal frequency division multiple access [FEATURE ID: 1] ( OFDMA ) - compatible base station that uses [TRANSITIVE ID: 2] subcarriers [FEATURE ID: 3] in a frequency domain [FEATURE ID: 4] and time slots [FEATURE ID: 5] in a time domain [FEATURE ID: 4] , the OFDMA - compatible base station comprising [TRANSITIVE ID: 6] : a plurality of antennas ; and a transmitter [FEATURE ID: 7] operably coupled to the plurality of antennas ; the transmitter configured to : insert first pilots [FEATURE ID: 3] of a first type onto a first plurality of subcarriers , wherein the first pilots are cell [FEATURE ID: 4] - specific pilots ; and insert data [FEATURE ID: 8] and second pilots [FEATURE ID: 9] of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam [FEATURE ID: 4] - formed ; and the plurality of antennas configured to transmit the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 2 . The OFDMA - compatible base station of claim [FEATURE ID: 10] 1 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 3 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers includes [TRANSITIVE ID: 6] an n th subcarrier [FEATURE ID: 3] and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 4 . The OFDMA - compatible base station of claim 1 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell [FEATURE ID: 4] . 5 . The OFDMA - compatible base station of claim 1 wherein the first plurality of subcarriers are not aligned in frequency [FEATURE ID: 11] with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 6 . The OFDMA - compatible base station of claim 1 wherein the second plurality of subcarriers are beam - formed . 7 . The OFDMA - compatible base station of claim 1 wherein the cell - specific pilots are used to convey cell - specific information . 8 . A method [FEATURE ID: 12] performed by an orthogonal frequency division multiple access ( OFDMA ) - compatible base station that uses subcarriers in a frequency domain and time slots in a time domain , the method comprising : inserting , by the OFDMA - compatible base station , first pilots of a first type onto a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; inserting , by the OFDMA - compatible base station , data and second pilots of a second type onto a second plurality of subcarriers ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and transmitting , by the OFDMA - compatible base station , the first plurality of subcarriers and the second plurality of subcarriers in at least one of the time slots using a plurality of antennas ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 9 . The method of claim 8 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 10 . The method of claim 8 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 11 . The method of claim 8 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 12 . The method of claim 8 wherein the first plurality of subcarriers are not aligned in frequency with subcarriers of at least another cell onto which respective cell - specific pilots are inserted . 13 . The method of claim 8 wherein the second plurality of subcarriers are beam - formed . 14 . The method of claim 8 wherein the cell - specific pilots are used to convey cell - specific information . 15 . An orthogonal frequency division multiple access ( OFDMA ) - compatible mobile station [FEATURE ID: 4] that uses subcarriers in a frequency domain and time slots in a time domain , the OFDMA - compatible mobile station comprising : at least one antenna ; and a receiver [FEATURE ID: 4] ; and the at least one antenna and the receiver are configured to : receive first pilots of a first type on a first plurality of subcarriers , wherein the first pilots are cell - specific pilots ; and receive second pilots of a second type and data on a second plurality of subcarriers , wherein the first plurality of subcarriers and the second plurality of subcarriers are received in at least one of the time slots ; wherein at least some subcarriers of the first plurality of subcarriers or the second plurality of subcarriers are beam - formed ; and the receiver is further [FEATURE ID: 13] configured to : recover the data using channel estimates [FEATURE ID: 3] from at least the second pilots ; and recover cell - specific information using the cell - specific pilots ; wherein the second type is different than the first type and wherein the first pilots do not interfere with the second pilots . 16 . The OFDMA - compatible mobile station of claim 15 wherein all subcarriers of the first plurality of subcarriers are different than all subcarriers of the second plurality of subcarriers . 17 . The OFDMA - compatible mobile station of claim 15 wherein the second plurality of subcarriers includes an n th subcarrier and an n +18 subcarrier spaced apart from the n th subcarrier by 17 subcarriers and the first plurality of subcarriers includes an m th subcarrier and an m +20 subcarrier spaced apart from the m th subcarrier by 19 subcarriers . 18 . The OFDMA - compatible mobile station of claim 15 wherein each cell - specific pilot of the cell - specific pilots is unique to a respective cell . 19 . The OFDMA - compatible mobile station of claim 15 wherein the first plurality of subcarriers are transmitted at a same time [FEATURE ID: 14]		1 . A transmitter apparatus [FEATURE ID: 4] making [TRANSITIVE ID: 6] use of an orthogonal frequency division [FEATURE ID: 1] multiplexing modulation [FEATURE ID: 12] and a spectrum [FEATURE ID: 3] spreading modulation in combination [FEATURE ID: 11] comprising [TRANSITIVE ID: 6] : an orthogonal frequency division multiplexing circuit which selectively modulates [TRANSITIVE ID: 2] information signals [FEATURE ID: 3] to be transmitted by orthogonal frequency division multiplexing [FEATURE ID: 3] ; a spectrum spreading circuit which selectively performs [TRANSITIVE ID: 2] a spectrum spreading modulation of said information signals to be transmitted ; and a transmission signal processing circuit [FEATURE ID: 7] which transfers said information signals which have been [TRANSITIVE ID: 13] modulated by either said orthogonal frequency division multiplexing modulation or said spectrum spreading modulation to a receiver apparatus [FEATURE ID: 4] as a transmission signal [FEATURE ID: 4] , wherein , when said receiver apparatus and said transmitter apparatus are located so close to each other that the received signal level [FEATURE ID: 9] of said receiver apparatus is sufficient to maintain the communication [FEATURE ID: 8] between said receiver apparatus and said transmitter apparatus with signals [FEATURE ID: 3] which are modulated on the basis of said orthogonal frequency division multiplexing modulation but not modulated on the basis of said spectrum spreading modulation , said orthogonal frequency division multiplexing circuit performs the modulation of said information signals to be transmitted while said spectrum spreading circuit does not perform said spectrum spreading modulation of said information signals to be transmitted , and wherein , when said receiver apparatus and said transmitter apparatus are located so remote from each other that the received signal level of said receiver apparatus is not sufficient to maintain the communication between said receiver apparatus and said transmitter apparatus with signals which are modulated on the basis of said orthogonal frequency division multiplexing modulation but not modulated on the basis of said spectrum spreading modulation , said orthogonal frequency division multiplexing circuit does not perform said orthogonal frequency division multiplexing modulation of said information signals to be transmitted while said spectrum spreading circuit performs said spectrum spreading modulation of said information signals to be transmitted . 2 . The transmitter apparatus as claimed in claim [FEATURE ID: 10] 1 wherein said orthogonal frequency division multiplexing circuit is provided with a serial - to - parallel converter which converts said information signals to be transmitted from a serial data sequence [FEATURE ID: 4] to a parallel data sequence , a modulator [FEATURE ID: 7] which serves to map said parallel data [FEATURE ID: 4] as converted by said serial - to - parallel converter onto symbols [FEATURE ID: 3] in the frequency domain [FEATURE ID: 3] , an inverse fast Fourier transform unit which performs the inverse fast Fourier transformation of said information signals as mapped and a parallel - to - serial converter which converts the output data sequence [FEATURE ID: 5] of the IFFT unit 16 from a parallel data sequence to a serial data sequence . 3 . The transmitter apparatus as claimed in claim 1 wherein said spectrum spreading circuit is provided with a spectrum spreading pattern generation circuit [FEATURE ID: 7] which generates a plurality of spectrum spreading patterns [FEATURE ID: 3] for use in said spectrum spreading modulation . 4 . The transmitter apparatus as claimed in claim 1 wherein said transmission signal processing circuit is provided with an adaptive array antenna and wherein , when said receiver apparatus and said transmitter apparatus are located so remote from each other that the received signal level of said receiver apparatus is not sufficient to maintain the communication between said receiver apparatus and said transmitter apparatus with signals which are modulated on the basis of said orthogonal frequency division multiplexing modulation but not modulated on the basis of said spectrum spreading modulation , the direction [FEATURE ID: 14]

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