A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) em
A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.
대표청구항▼
1. A method of performing channel estimation in a wireless multiple-input multiple-output (MIMO) communication system, comprising: receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user termi
1. A method of performing channel estimation in a wireless multiple-input multiple-output (MIMO) communication system, comprising: receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;deriving a matched filter based on the estimated channel response of the at least one eigenmode of the uplink;receiving a data transmission via the at least one eigenmode of the uplink from the user terminal; andusing the matched filter for matched filtering of the data transmission. 2. A method of performing channel estimation in a wireless multiple-input multiple-output (MIMO) communication system, comprising: receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;deriving at least one steering vector based on the estimated channel response of the at least one eigenmode of the downlink; andusing the at least one steering vector for data transmission on the at least one eigenmode of the downlink to the user terminal. 3. The method of claim 2, wherein the steered pilot is received via a plurality of eigenmodes of the uplink, wherein the channel response of a plurality of eigenmode of the downlink for the user terminal is estimated based on the received steered pilot, and wherein a plurality of steering vectors are derived based on the estimated channel response of the plurality of eigenmodes of the downlink. 4. The method of claim 3, wherein the plurality of steering vectors are derived to be orthogonal to one another. 5. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising: a receive spatial processor operative to receive a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal; anda controller operative to estimate a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot, wherein the controller is further operative to derive a matched filter based on the estimated channel response of the at least one eigenmode of the uplink;wherein the receive spatial processor operative to receive a data transmission via the at least one eigenmode of the uplink from the user terminal and use the matched filter for matched filtering of the data transmission. 6. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising: a receive spatial processor operative to receive a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;a controller operative to estimate a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot, to estimate a channel response of at least one eigenmode of a downlink for the user terminal based on the received steered pilot, and to derive at least one steering vector based on the estimated channel response of the at least one eigenmode of the downlink; anda transmit spatial processor operative to use the at least one steering vector for data transmission on the at least one eigenmode of the downlink to the user terminal. 7. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising: means for receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal; andmeans for estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;means for deriving a matched filter based on the estimated channel response of the at least one eigenmode of the uplink;means for receiving a data transmission via the at least one eigenmode of the uplink from the user terminal; andmeans for using the matched filter for matched filtering of the data transmission. 8. The apparatus of claim 7, further comprising: means for estimating a channel response of at least one eigenmode of a downlink for the user terminal based on the received steered pilot. 9. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising: means for receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;means for estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;means for estimating a channel response of at least one eigenmode of a downlink for the user terminal based on the received steered pilot;means for deriving at least one steering vector based on the estimated channel response of the at least one eigenmode of the downlink; andmeans for using the at least one steering vector for data transmission on the at least one eigenmode of the downlink to the user terminal. 10. A memory unit used in a wireless multiple-input multiple-output (MIMO) communication system having software codes stored thereon, the software codes being executable by one or more processors and the software codes comprising: codes for receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;codes for estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;codes for deriving a matched filter based on the estimated channel response of the at least one eigenmode of the uplink;codes for receiving a data transmission via the at least one eigenmode of the uplink from the user terminal; andcodes for using the matched filter for matched filtering of the data transmission. 11. A memory unit used in a wireless multiple-input multiple-output (MIMO) communication system having software codes stored thereon, the software codes being executable by one or more processors and the software codes comprising: codes for receiving a steered pilot via at least one eigenmode of an uplink from a user terminal, the steered pilot being transmitted via a plurality of antennas at the user terminal;codes for estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot;codes for estimating a channel response of at least one eigenmode of a downlink for the user terminal based on the received steered pilot;codes for deriving at least one steering vector based on the estimated channel response of the at least one eigenmode of the downlink: andcodes for using the at least one steering vector for data transmission on the at least one eigenmode of the downlink to the user terminal.
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Olkkonen, Mikko; Nyman, Kai; Bouet, Stephane, Ad hoc network discovery menu.
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.
Cox Lloyd C. ; Gramlich Gary A. ; Baker Robert M. ; Freeman Stephen ; Neary Brian P. ; Krzemien Cynthia R. ; Krim Jordan A. ; Nunez Luis R., Beamforming and interference cancellation system using general purpose filter architecture.
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.
Dogan Mithat Can ; Stearns Stephen Deane, Communication apparatus for transmitting and receiving signals over a fiber-optic waveguide using different frequency bands of light.
Visotsky Yevgeny ; Frank Colin D. ; Madhow Upamanyu ; Singh Rahul, Communication device and method for interference suppression using adaptive equalization in a spread spectrum communication system.
Esteve Asensio, Guillermo; Rubio Andres, Francisco Javier; Murillo Fuentes, Juan Jose; Martinez Olmos, Pablo, Detecting interference in a wireless communication system.
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.
Chen, Tao; Holtzman, Jack M.; Ling, Fuyun; Saints, Keith; Sindhushayana, Nagabhushana; Wheatley, III, Charles E., Method and apparatus for adjusting power control setpoint in a wireless communication system.
Levin,Jeffrey A.; Wilborn,Thomas B.; Butler,Brian K.; Bender,Paul E., Method and apparatus for canceling pilot interference in a wireless communication system.
Girardeau,James; Wallace,Bradley; Aardema,Christopher Alan, Method and apparatus for establishing non-standard data rates in a wireless communication system.
Merchant Zaffer S. (Lantana FL) Saidi Ali (Boynton Beach FL) Orlen Noah P. (Boca Raton FL), Method and apparatus for facsimile communication of first and second type information with selective call communication.
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.
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.
Zhang, Jianzhong; Raghothaman, Balaji; Wang, Yan; Mandyam, Giridhar, Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels.
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.
Walke,Bernhard; Esseling,Norbert, Method for the operation of wireless base stations for packet transfer radio systems having a guaranteed service quality.
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.
Catreux, Severine; Erceg, Vinko; Roux, Pieter; Van Rooyen, Pieter; Winters, Jack, Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining.
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.
Medvedev,Irina; Walton,Jay R.; Ketchum,John W., Power control for partial channel-state information (CSI) multiple-input, multiple-output (MIMO) systems.
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.
Medvedev,Irina; Walton,Jay Rod; Ketchum,John W., Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems.
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.
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.
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.
Novlan, Thomas David; Majmundar, Milap; Ghosh, Arunabha, Initial access and radio resource management for integrated access and backhaul (IAB) wireless networks.
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