MIMO system with multiple spatial multiplexing modes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04J-011/00
H04W-004/00
H04L-001/04
H04L-027/08
출원번호
US-0693429
(2003-10-23)
등록번호
US-8208364
(2012-06-26)
발명자
/ 주소
Walton, J. Rodney
Ketchum, John W.
Wallace, Mark S.
Howard, Steven J.
출원인 / 주소
Qualcomm Incorporated
대리인 / 주소
Qualcomm Patent Group
인용정보
피인용 횟수 :
27인용 특허 :
244
초록▼
A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transm
A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas. For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.
대표청구항▼
1. A method of transmitting data in a wireless multiple-input multiple-output (MIMO) communication system, comprising: coding and modulating a first plurality of data streams to obtain a first plurality of data symbol streams;using a steered spatial multiplexing mode, spatially processing the first
1. A method of transmitting data in a wireless multiple-input multiple-output (MIMO) communication system, comprising: coding and modulating a first plurality of data streams to obtain a first plurality of data symbol streams;using a steered spatial multiplexing mode, spatially processing the first plurality of data symbol streams with a first plurality of steering vectors to obtain a first plurality of transmit symbol streams for transmission from a plurality of antennas to a first user terminal in a first transmission interval;coding and modulating a second plurality of data streams to obtain a second plurality of data symbol streams; andusing a non-steered spatial multiplexing mode, providing the second plurality of data symbol streams as a second plurality of transmit symbol streams for transmission from the plurality of antennas to a second user terminal in a second transmission interval. 2. The method of claim 1, further comprising: deriving the first plurality of steering vectors such that the first plurality of data streams are transmitted on a plurality of orthogonal spatial channels of a first MIMO channel for the first user terminal. 3. The method of claim 1, further comprising: coding and modulating a third plurality of data streams to obtain a third plurality of data symbol streams; andspatially processing the third plurality of data symbol streams with a second plurality of steering vectors to obtain a third plurality of transmit symbol streams for transmission from the plurality of antennas to a plurality of user terminals in a third transmission interval. 4. The method of claim 3, further comprising: deriving the second plurality of steering vectors such that the third plurality of data streams are received with suppressed crosstalk at the plurality of user terminals. 5. An apparatus in a wireless multiple-input multiple-output (MIMO) system, comprising: a transmit data processor operative tocode and modulate a first plurality of data streams to obtain a first plurality of data symbol streams, andcode and modulate a second plurality of data streams to obtain a second plurality of data symbol streams; anda transmit spatial processor operative tousing a steered spatial multiplexing mode, spatially process the first plurality of data symbol streams with a first plurality of steering vectors to obtain a first plurality of transmit symbol streams for transmission from a plurality of antennas to a first user terminal in a first transmission interval, andusing a non-steered spatial multiplexing mode, provide the second plurality of data symbol streams as a second plurality of transmit symbol streams for transmission from the plurality of antennas to a second user terminal in a second transmission interval. 6. The apparatus of claim 5, further comprising: a processor operative to derive the first plurality of steering vectors such that the first plurality of data streams are transmitted on a plurality of orthogonal spatial channels of a first MIMO channel for the first user terminal. 7. The apparatus of claim 5, wherein: the transmit data processor is also operative to code and modulate a third plurality of data streams to obtain a third plurality of data symbol streams; andthe transmit spatial processor is also operative to, using the steered spatial multiplexing mode, spatially process the third plurality of data symbol streams with a second plurality of steering vectors to obtain a third plurality of transmit symbol streams for transmission from the plurality of antennas to a plurality of user terminals in a third transmission interval. 8. The apparatus of claim 7, further comprising: a processor operative to derive the second plurality of steering vectors such that the third plurality of data streams are received with suppressed crosstalk at the plurality of user terminals. 9. A method of receiving data in a wireless multiple-input multiple-output (MIMO) communication system, comprising: using a steered spatial multiplexing mode, processing a first plurality of received symbol streams to obtain a first plurality of recovered data symbol streams;demodulating and decoding the first plurality of recovered data symbol streams in accordance with a first plurality of rates to obtain a first plurality of decoded data streams;using a non-steered spatial multiplexing mode, processing a second plurality of received symbol streams to obtain a second plurality of recovered data symbol streams; anddemodulating and decoding the second plurality of recovered data symbol streams in accordance with a second plurality of rates to obtain a second plurality of decoded data streams. 10. The method of claim 9, wherein the first plurality of received symbol streams are spatially processed with a plurality of eigenvectors for a plurality of spatial channels of a MIMO channel for a user terminal. 11. The method of claim 9, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted by a single user terminal. 12. The method of claim 9, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted simultaneously by a plurality of user terminals. 13. The method of claim 9, wherein the second plurality of received symbol streams are spatially processed based on a channel correlation matrix inversion (CCMI) technique. 14. The method of claim 9, wherein the second plurality of received symbol streams are spatially processed based on a minimum mean square error (MMSE) technique. 15. The method of claim 9, wherein the second plurality of received symbol streams are spatially processed based on a successive interference cancellation (SIC) technique. 16. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising: a receive spatial processor operative tousing a steered spatial multiplexing mode, process a first plurality of received symbol streams to obtain a first plurality of recovered data symbol streams, andusing a non-steered spatial multiplexing mode, process a second plurality of received symbol streams to obtain a second plurality of recovered data symbol streams; anda receive data processor operative todemodulate and decode the first plurality of recovered data symbol streams in accordance with a first plurality of rates to obtain a first plurality of decoded data streams, anddemodulate and decode the second plurality of recovered data symbol streams in accordance with a second plurality of rates to obtain a second plurality of decoded data streams. 17. The apparatus of claim 16, wherein the first plurality of received symbol streams are spatially processed with a plurality of eigenvectors for a plurality of spatial channels of a MIMO channel for a user terminal. 18. The apparatus of claim 16, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted by a single user terminal. 19. The apparatus of claim 16, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted simultaneously by a plurality of user terminals. 20. The apparatus of claim 16, wherein the second plurality of received symbol streams are spatially processed based on a channel correlation matrix inversion (CCMI) technique. 21. The apparatus of claim 16, wherein the second plurality of received symbol streams are spatially processed based on a minimum mean square error (MMSE) technique. 22. The apparatus of claim 16, wherein the second plurality of received symbol streams are spatially processed based on a successive interference cancellation (SIC) technique. 23. An apparatus of transmitting data in a wireless multiple-input multiple-output (MIMO) communication system, comprising: means for coding and modulating a first plurality of data streams to obtain a first plurality of data symbol streams;means for spatially processing, using a steered spatial multiplexing mode, the first plurality of data symbol streams with a first plurality of steering vectors to obtain a first plurality of transmit symbol streams for transmission from a plurality of antennas to a first user terminal in a first transmission interval;means for coding and modulating a second plurality of data streams to obtain a second plurality of data symbol streams; andmeans for providing, using a non-steered spatial multiplexing mode, the second plurality of data symbol streams as a second plurality of transmit symbol streams for transmission from the plurality of antennas to a second user terminal in a second transmission interval. 24. The apparatus of claim 23, further comprising: means for deriving the first plurality of steering vectors such that the first plurality of data streams are transmitted on a plurality of orthogonal spatial channels of a first MIMO channel for the first user terminal. 25. The apparatus of claim 23, further comprising: means for coding and modulating a third plurality of data streams to obtain a third plurality of data symbol streams; andmeans for spatially processing the third plurality of data symbol streams with a second plurality of steering vectors to obtain a third plurality of transmit symbol streams for transmission from the plurality of antennas to a plurality of user terminals in a third transmission interval. 26. The apparatus of claim 25, further comprising: means for deriving the second plurality of steering vectors such that the third plurality of data streams are received with suppressed crosstalk at the plurality of user terminals. 27. A computer-program product for transmitting data in a wireless multiple-input multiple-output (MIMO) communication system comprising a non-transitory computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising: instructions for coding and modulating a first plurality of data streams to obtain a first plurality of data symbol streams;instructions for spatially processing, using a steered spatial multiplexing mode, the first plurality of data symbol streams with a first plurality of steering vectors to obtain a first plurality of transmit symbol streams for transmission from a plurality of antennas to a first user terminal in a first transmission interval;instructions for coding and modulating a second plurality of data streams to obtain a second plurality of data symbol streams; andinstructions for providing, using a non-steered spatial multiplexing mode, the second plurality of data symbol streams as a second plurality of transmit symbol streams for transmission from the plurality of antennas to a second user terminal in a second transmission interval. 28. The computer-program product of claim 27, further comprising: instructions for deriving the first plurality of steering vectors such that the first plurality of data streams are transmitted on a plurality of orthogonal spatial channels of a first MIMO channel for the first user terminal. 29. The computer-program product of claim 27, further comprising: instructions for coding and modulating a third plurality of data streams to obtain a third plurality of data symbol streams; andinstructions for spatially processing the third plurality of data symbol streams with a second plurality of steering vectors to obtain a third plurality of transmit symbol streams for transmission from the plurality of antennas to a plurality of user terminals in a third transmission interval. 30. The computer-program product of claim 29, further comprising: instructions for deriving the second plurality of steering vectors such that the third plurality of data streams are received with suppressed crosstalk at the plurality of user terminals. 31. An apparatus of receiving data in a wireless multiple-input multiple-output (MIMO) communication system, comprising: means for processing, using a steered spatial multiplexing mode, a first plurality of received symbol streams to obtain a first plurality of recovered data symbol streams;means for demodulating and decoding the first plurality of recovered data symbol streams in accordance with a first plurality of rates to obtain a first plurality of decoded data streams;means for processing, using a non-steered spatial multiplexing mode, a second plurality of received symbol streams to obtain a second plurality of recovered data symbol streams; andmeans for demodulating and decoding the second plurality of recovered data symbol streams in accordance with a second plurality of rates to obtain a second plurality of decoded data streams. 32. The apparatus of claim 31, wherein the first plurality of received symbol streams are spatially processed with a plurality of eigenvectors for a plurality of spatial channels of a MIMO channel for a user terminal. 33. The apparatus of claim 31, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted by a single user terminal. 34. The apparatus of claim 31, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted simultaneously by a plurality of user terminals. 35. The apparatus of claim 31, wherein the second plurality of received symbol streams are spatially processed based on a channel correlation matrix inversion (CCMI) technique. 36. The apparatus of claim 31, wherein the second plurality of received symbol streams are spatially processed based on a minimum mean square error (MMSE) technique. 37. The apparatus of claim 31, wherein the second plurality of received symbol streams are spatially processed based on a successive interference cancellation (SIC) technique. 38. A computer-program product for receiving data in a wireless multiple-input multiple-output (MIMO) communication system comprising a non-transitory computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising: instructions for processing, using a steered spatial multiplexing mode, a first plurality of received symbol streams to obtain a first plurality of recovered data symbol streams;instructions for demodulating and decoding the first plurality of recovered data symbol streams in accordance with a first plurality of rates to obtain a first plurality of decoded data streams;instructions for processing, using a non-steered spatial multiplexing mode, a second plurality of received symbol streams to obtain a second plurality of recovered data symbol streams; andinstructions for demodulating and decoding the second plurality of recovered data symbol streams in accordance with a second plurality of rates to obtain a second plurality of decoded data streams. 39. The computer-program product of claim 38, wherein the first plurality of received symbol streams are spatially processed with a plurality of eigenvectors for a plurality of spatial channels of a MIMO channel for a user terminal. 40. The computer-program product of claim 38, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted by a single user terminal. 41. The computer-program product of claim 38, wherein the second plurality of decoded data streams are estimates of a plurality of data streams transmitted simultaneously by a plurality of user terminals. 42. The computer-program product of claim 38, wherein the second plurality of received symbol streams are spatially processed based on a channel correlation matrix inversion (CCMI) technique. 43. The computer-program product of claim 38, wherein the second plurality of received symbol streams are spatially processed based on a minimum mean square error (MMSE) technique. 44. The computer-program product of claim 38, wherein the second plurality of received symbol streams are spatially processed based on a successive interference cancellation (SIC) technique.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (244)
Kim, Younglok; Zeira, Ariela, Adaptive algorithm for a Cholesky approximation.
Lee,Yong Suk; Kim,Sung Jin; Lee,Jong Hyeuk; Park,Sang Hwan; Kim,Hun Kee, Apparatus and method for transmitting and receiving data using an antenna array in a mobile communication system.
Eberlein Ernst,DEX ; Breiling Marco,DEX ; Stoessel Jan,DEX ; Gerhauser Heinz,DEX, Apparatus and method for transmitting information and apparatus and method for receiving information.
Choi,Sung Ho; Lee,Ju Ho; Kim,Sung Hoon; Chang,Jin Weon, Apparatus and method for transmitting/receiving serving HS-SCCH set information in an HSDPA communication system.
Heide Carolyn (Lincolnshire IL), Apparatus for exchanging data between a central station and a plurality of wireless remote stations on a time divided co.
Menon, Murali Paravath; Ketchum, John W.; Wallace, Mark; Walton, Jay Rod; Howard, Steven J., Beam-steering and beam-forming for wideband MIMO/MISO systems.
Wallace,Mark S.; Ketchum,John W.; Walton,J. Rodney; Howard,Steven J., Calibration of downlink and uplink channel responses in a wireless MIMO communication system.
Onggosanusi,Eko Nugroho; Van Veen,Barry Dean; Sayeed,Akbar Muhammad, Channel aware optimal space-time signaling for wireless communication over wideband multipath channels.
Maeng, Seung-Joo; Yeom, Jae-Heung; Ahn, Jae-Min; Kim, Young Ky, Device and method of continuous outer-loop power control in DTX mode for CDMA mobile communication system.
Rogard,Roger; Youssefmir,Michael; Ottersten,Bjorn Erik, Downlink transmission in a wireless data communication system having a base station with a smart antenna system.
Mahesh, Harihara; Leano, Chrisanto de Jesus; Jafar, Syed S.; Azarakhsh, Nozar, Dynamic modulation of modulation profiles for communication channels in an access network.
Wallace,Mark S.; Walton,Jay Rodney; Howard,Steven J., Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system.
Lindskog, Erik D.; Trott, Mitchell D.; Trigui, Hafedh; de la Barbosa, Serge, Estimation of downlink transmission parameters in a radio communications system with an adaptive antenna array.
Chang, Li Fung; Chawla, Kapil K.; Chuang, Justin C.; Qiu, Xiaoxin; Sollenberger, Nelson R., Medium access control layer for packetized wireless systems.
Myles, Andrew Frederick; Skellern, David James; Deane, John Fraser; Percival, Terence Michael Paul; Zhou, Sihui; Lam, Alex Chun Kit, Medium access control protocol for data communications.
Sindhushayana, Nagabhushana T.; Esteves, Eduardo A. S.; Attar, Rashid A.; Wu, Qiang, Method and apparatus for adaptive rate selection in a communication system.
Chow Peter S. (Redwood City CA) Cioffi John M. (Cupertino CA), Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digita.
Levin,Jeffrey A.; Wilborn,Thomas B.; Butler,Brian K.; Bender,Paul E., Method and apparatus for canceling pilot interference in a wireless communication system.
Boros, Tibor; Barratt, Craig H.; Uhlik, Christopher R.; Trott, Mitchell D., Method and apparatus for determining signatures for calibrating a communication station having an antenna array.
Girardeau,James; Wallace,Bradley; Aardema,Christopher Alan, Method and apparatus for establishing non-standard data rates in a wireless communication system.
Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
D\Amico Thomas V. (Boca Raton FL) Dorenbosch Jheroen (Waxahachie TX), Method and apparatus for implementing a received signal quality measurement in a radio communication system.
Ayerst Douglas I. (Delray Beach FL) Cannon Gregory (Keller TX) Khan Malik J. (Lake Worth FL) Hill Richard A. (Boca Raton FL), Method and apparatus for inbound channel selection in a communication system.
Kapoor, Samir; Marchok, Daniel J., Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems.
Mark Wallace ; Jay R. Walton ; Ahmad Jalali, Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system.
Walton,Jay R.; Ketchum,John W., Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion.
Walton, Jay R.; Ketchum, John W., Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission.
Walton, Jay R.; Wallace, Mark; Ketchum, John W.; Howard, Steven J., Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information.
Ling, Fuyun; Walton, Jay R.; Howard, Steven J.; Wallace, Mark; Ketchum, John W., Method and apparatus for utilizing channel state information in a wireless communication system.
Ling,Fuyun; Walton,Jay R.; Howard,Steven J.; Wallace,Mark; Ketchum,John W., Method and apparatus for utilizing channel state information in a wireless communication system.
Gunzelmann, Bertram; Molev-Shteiman, Arkadi, Method and arrangement for minimizing the autocorrelation error in the demodulation of a spread-spectrum signal subject to multipath propagation.
Demers, Stephanie; Parr, Michael; Noerpel, Anthony; Roos, Dave, Method and system for position determination using geostationary earth orbit satellite.
Pautler, Joseph J.; Rohani, Kamyar; Harrison, Robert M., Method and system in a transceiver for controlling a multiple-input, multiple-output communications channel.
Arogyaswami J. Paulraj ; Peroor K. Sebastian ; David J. Gesbert ; Jose Tellado, Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter.
Peeters Johan,BEX ; Spruyt Paul Marie Pierre,BEX ; Kerckhove Jean-Francois Van,BEX, Method for allocating data elements to a set of carriers, mapping unit and modulator to perform this method.
Petrus Paul ; Chiodini Alain M. ; Trott Mitchell D. ; Parish David M. ; Youssefmir Michael ; Rosenfeld Dov, Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing.
Olofsson H.ang.kan Gunnar,SEX ; Thielecke Jorn,DEX, Method for selecting a combination of modulation and channel coding schemes in a digital communication system.
Kogiantis, Achilles George; Rudrapatna, Ashok N.; Sunay, Mehmet Oguz, Method for simultaneously conveying information to multiple mobiles with multiple antennas.
Berthet,Antoine; Visoz,Rapha챘l, Method of coding/decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception in the presence of intersymbol interference and corresponding system.
Liu,Jung Tao; Liu,Youjian; Rudrapatna,Ashok, Method of determining transmit power for transmit eigenbeams in a multiple-input multiple-output communications system.
Louis A. Stilp ; Joseph W. Sheehan ; Alan E. E. Rogers ; Robert J. Anderson ; Vineet Sachdev, Mobile-assisted network based techniques for improving accuracy of wireless location system.
Gesbert,David J.; Catreux,Severine E.; Heath, Jr.,Robert W., Mode lookup tables for data transmission in wireless communication channels based on statistical parameters.
Gesbert, David J.; Catreux, Severine E.; Heath, Jr., Robert W.; Sebastian, Peroor K.; Paulraj, Arogyaswami J., Mode selection for data transmission in wireless communication channels based on statistical parameters.
Nissani (Nissensohn),Daniel Nathan, Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels.
Bruno Ronald ; Schuchman Leonard, Multi-access CS-P/CD-E system and protocols on satellite channels applicable to a group of mobile users in close proximity.
Saito Masafumi,JPX ; Ikeda Tetsuomi,JPX, Orthogonal frequency division multiplexing transmission system and transmitter and receiver adapted to the same.
Habbab Isam M. I. (Aberdeen NJ) Kavehrad Mohsen (Holmdel NJ) Sundberg Carl-Erik (Hazlet NJ), Packet switched interconnection protocols for a star configured optical lan.
Nelson, Jr.,George Rodney; Proctor, Jr.,James A.; Hoffmann,John E.; Rouphael,Antoine J., Qualifying available reverse link coding rates from access channel power setting.
Fukuda, Kunio, Radio communication system, radio base-station apparatus, mobile radio-station apparatus, radio zone assignment method, and radio communication method.
du Crest, Gilles; Cayla, Stéphane, Radio telecommunications system and method of operating the same with reduced delays for data transmission over a radio interface.
Servais Frederic Henri ; Johnson Phillip Marc, Received signal quality determination method and systems for convolutionally encoded communication channels.
Chou, Philip A.; Wang, Albert S.; Mehrotra, Sanjeev; Mohr, Alexander E., Receiver-driven layered error correction multicast over heterogeneous packet networks.
Kerr,Adam B.; Lindskog,Erik D.; Brunner,Christopher; Trott,Mitchell D., Selection of user-specific transmission parameters for optimization of transmit performance in wireless communications using a common pilot channel.
Christopher S. Looney ; Justin Wolfe ; Kirk W. Charles ; Jeffrey T. Stout ; Saro Nalbandian ; Stephen J. Zwoniter, Surgical retractor and tissue stabilization device.
Ma,Jianglei; Tong,Wen; Wu,Shiquan, Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications.
Ma, Jianglei; Jia, Ming; Zhu, Peiying; Tong, Wen, System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design.
Qiang Wu ; Peter J. Black ; Nagabhushana T. Sindhushayna, System and method for accurately predicting signal to interference and noise ratio to improve communications system performance.
Noerpel, Anthony; Ravishankar, Channasandra; He, Xiaoping; Saha, Abheek, System and method for providing contention channel organization for broadband satellite access in a communications network.
Maltsev,Alexander A.; Sadri,Ali S.; Rubtsov,Alexey E.; Davydov,Alexei V., System and method for selecting data rates to provide uniform bit loading of subcarriers of a multicarrier communication channel.
Catreux, Severine; Gesbert, David; Airy, Manish, System and method of dynamically optimizing a transmission mode of wirelessly transmitted information.
Bottomley Gregory E. ; Chen Jyun-Cheng ; Koilpillai R. David, System and methods for selecting an appropriate detection technique in a radiocommunication system.
Snijders Wilfred A. M. (Eindhoven NLX) Van Grinsven Petrus A. M. (Eindhoven NLX), TDM data communications network wherein each data frame is divided into respective lower rate sub-frames for respective.
Ketchum, John W.; Wallace, Mark; Howard, Steven J.; Walton, Jay Rod, Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems.
Bohnke, Ralf; Izumi, Seiichi, Transmission method and transmission apparatus for transmitting signals on the basis of a OFDM/TDMA-system with pilot symbols.
Yun, Yu-Suk; Yoon, Soon-Young; Maeng, Seung-Joo, Transmitting and receiving device and method for continuous outer-loop power control while in DTX mode in a CDMA mobile communication system.
Crilly, Jr., William J.; Biba, Ken; Conley, Robert J., Wireless packet switched communication systems and networks using adaptively steered antenna arrays.
Dabak, Anand G.; Hosur, Srinath, Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities.
Hou, Jilei; Smee, John E.; Malladi, Durga Prasad; Hassanpour Ghady, Navid; Mallik, Siddhartha, Method and apparatus for supporting multi-user and single-user MIMO in a wireless communication system.
Walton, Jay Rodney; Ketchum, John Wendell; Wallace, Mark S.; Howard, Steven J.; Nanda, Sanjiv, Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.