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公开(公告)号:ES2373662T3
公开(公告)日:2012-02-07
申请号:ES04814424
申请日:2004-12-15
Applicant: QUALCOMM INC
Inventor: WALTON JAY RODNEY , ZHENG LIZHONG , KETCHUM JOHN W , WALLACE MARK S , HOWARD STEVEN J
Abstract: Un procedimiento de provisión de datos para su transmisión en un sistema de comunicación inalámbrica de múltiple entrada y múltiple salida MIMO, comprendiendo el procedimiento: procesar datos (112, 114) para obtener al menos un bloque de símbolos de datos; dividir (114) el al menos un bloque de símbolos de datos en una pluralidad de sub-bloques de símbolos de datos; seleccionar (118) una matriz de orientación para cada sub-bloque de símbolos de datos; procesar espacialmente (118, 120) el al menos un bloque de símbolos de datos con una pluralidad de matrices de orientación para obtener una pluralidad de secuencias de símbolos de transmisión, correspondiendo cada secuencia a un sub-bloque diferente del al menos un bloque de símbolos de datos, en el que procesar espacialmente el al menos un bloque de símbolos de datos comprende procesar espacialmente cada sub-bloque de símbolos de datos con la matriz de orientación seleccionada para ese sub-bloque; proporcionar (122) la pluralidad de secuencias de símbolos de transmisión a una pluralidad de antenas de transmisión para su transmisión, en el que la pluralidad de matrices de orientación aleatorizan un canal MIMO efectivo observado por una entidad de recepción para el al menos un bloque de símbolos de datos realizando el procesamiento espacial con la pluralidad de matrices de orientación.
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公开(公告)号:DK1556985T3
公开(公告)日:2012-01-16
申请号:DK03781530
申请日:2003-10-24
Applicant: QUALCOMM INC
Inventor: KETCHUM JOHN W , WALLACE MARK , HOWARD STEVEN J , WALTON RODNEY J
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公开(公告)号:CA2556710C
公开(公告)日:2011-12-20
申请号:CA2556710
申请日:2005-02-18
Applicant: QUALCOMM INC
Inventor: WALLACE MARK S , KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J
Abstract: The downlink and uplink are calibrated to account for differences in the responses of transmit and receive chains at an access point and a user terminal. For initial calibration, the access point and user terminal transmit MIMO pilots on the downlink and uplink, which are used to derive channel estimates including the responses of the applicable transmit/receive chains. Correction matrices (a) and (b) are derived based on these channel estimates and thereafter used by the access point and user terminal, respectively. For follow-on calibration, one entity transmits a MIMO pilot and a steered reference. The other entity derives a first transmit matrix based on the steered reference and a second transmit matrix based on the MIMO pilot and calibration error matrices (c) and (d), which contain estimates of the errors in (a) and (b), respectively. (c) and (d) may be iteratively adjusted based on an adaptive procedure to minimize the errors between the two transmit matrices.
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公开(公告)号:AU2009200283B2
公开(公告)日:2011-03-03
申请号:AU2009200283
申请日:2009-01-27
Applicant: QUALCOMM INC
Inventor: KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J , WALLACE MARK S
Abstract: For data transmission with spatial spreading, a transmitting entity (1) encodes and modulates each data packet to obtain a corresponding data symbol block, (2) multiplexes data symbol blocks onto N S data symbol streams for transmission on N S transmission channels of a MIMO channel, (3) spatially spreads the N S data symbol streams with steering matrices, and (4) spatially processes N S spread symbol streams for full-CSI transmission on N S eigenmodes or partial-CSI transmission on N S spatial channels of the MIMO channel. A receiving entity (1) obtains N R received symbol streams via N R receive antennas, (2) performs receiver spatial processing for full-CSI or partial-CSI transmission to obtain N S detected symbol streams, (3) spatially despreads the N S detected symbol streams with the same steering matrices used by the transmitting entity to obtain N S recovered symbol streams, and (4) demodulates and decodes each recovered symbol block to obtain a corresponding decoded data packet.
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公开(公告)号:ES2347028T3
公开(公告)日:2010-10-22
申请号:ES99953000
申请日:1999-10-01
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , KETCHUM JOHN W , HOWARD STEVEN J , WALLACE MARK S
Abstract: Un procedimiento para indicar si una estación móvil (1300) que está intentando acceder a un canal de acceso múltiple (1503) ha ganado acceso al canal de acceso múltiple, que incluye las etapas de: a) recibir en una estación de base (1400) una petición de acceso al canal de acceso múltiple (1503), petición que incluye un preámbulo (1510, 1513) y un valor hash que indica la identidad de la estación móvil (1300); b) transmitir desde la estación de base (1400) sobre un canal de control un bit de control de potencia, cuya presencia indica que el canal de acceso múltiple (1503) está ocupado, si el canal de acceso múltiple está ocupado; c) asignar el canal de acceso múltiple (1503) al valor hash sólo si el canal de acceso múltiple no está ocupado; d) radiodifundir un mensaje desde la estación de base (1400) sobre dicho canal de control, mensaje que incluye el valor hash recibido con la petición; en el que dicha radiodifusión comprende transmitir una palabra de ajuste de potencia inicial utilizando bits preasignados de una sub-mini-ventana en respuesta a un nivel de potencia del preámbulo (1510), en el que al menos uno de los bits preasignados de la palabra de ajuste de potencia inicial está preasignado para devolver por eco el valor hash recibido de la estación móvil (1300) una vez que el valor hash ha sido recibido.
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公开(公告)号:SG162800A1
公开(公告)日:2010-07-29
申请号:SG2010042638
申请日:2006-06-07
Applicant: QUALCOMM INC
Inventor: HOWARD STEVEN J , KETCHUM JOHN W , WALLACE MARK S , MONSEN PETER , WALTON JAY RODNEY
IPC: H04J99/00
Abstract: Techniques to efficiently derive a spatial filter matrix are described. In a first scheme, a Hermitian matrix is iteratively derived based on a channel response matrix, and a matrix inversion is indirectly calculated by deriving the Hermitian matrix iteratively. The spatial filter matrix is derived based on the Hermitian matrix and the channel response matrix. In a second scheme, multiple rotations are performed to iteratively obtain first and second matrices for a pseudo-inverse matrix of the channel response matrix. The spatial filter matrix is derived based on the first and second matrices. In a third scheme, a matrix is formed based on the channel response matrix and decomposed to obtain a unitary matrix and a diagonal matrix. The spatial filter matrix is derived based on the unitary matrix, the diagonal matrix, and the channel response matrix.
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公开(公告)号:AU2009200382B2
公开(公告)日:2010-07-22
申请号:AU2009200382
申请日:2009-02-03
Applicant: QUALCOMM INC
Inventor: WALLACE MARK S , KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J
IPC: H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L12/28 , H04L12/56 , H04L25/02 , H04L25/03 , H04L27/26
Abstract: 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.
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公开(公告)号:AU2003287291C1
公开(公告)日:2010-06-03
申请号:AU2003287291
申请日:2003-10-24
Applicant: QUALCOMM INC
Inventor: WALLACE MARK S , KETCHUM JOHN W , WALTON J RODNEY , HOWARD STEVEN J
IPC: H04L12/28 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L1/18 , H04L12/56 , H04L25/02 , H04L25/03 , H04L27/00 , H04L27/26 , H04W28/06 , H04W28/20 , H04W28/22 , H04W52/00 , H04W52/42 , H04W52/50 , H04W72/04 , H04W72/12 , H04W74/00 , H04W74/08 , H04W84/12
Abstract: 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 acknowledgement, 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.
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公开(公告)号:ES2339242T3
公开(公告)日:2010-05-18
申请号:ES03781524
申请日:2003-10-24
Applicant: QUALCOMM INC
Inventor: WALTON J RODNEY , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC: H04W16/28 , H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L1/18 , H04L12/28 , H04L12/56 , H04L25/02 , H04L25/03 , H04L27/00 , H04L27/26 , H04W28/06 , H04W28/20 , H04W28/22 , H04W52/00 , H04W52/42 , H04W52/50 , H04W72/04 , H04W72/12 , H04W74/00 , H04W74/08 , H04W84/12
Abstract: Un procedimiento de transmitir pilotos en un sistema de comunicación inalámbrica de múltiples entradas y múltiples salidas (MIMO), caracterizado por: transmitir un piloto de MIMO desde una pluralidad de antenas (724, 752) de una primera entidad (110, 120) de comunicación y por un primer enlace de comunicación, en donde el piloto de MIMO comprende una pluralidad de transmisiones piloto enviadas desde la pluralidad de antenas (724, 752), y donde la transmisión piloto desde cada antena (724, 752) es identificable por una segunda entidad (110, 120) de comunicación que recibe el piloto de MIMO; y recibir en la primera entidad (110, 120) de comunicación un piloto guiado mediante al menos una automodalidad de un segundo enlace de comunicación, desde la segunda entidad (110, 120) de comunicación, en donde el piloto guiado se genera sobre la base del piloto de MIMO.
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公开(公告)号:AT449470T
公开(公告)日:2009-12-15
申请号:AT05019630
申请日:2003-10-24
Applicant: QUALCOMM INC
Inventor: WALTON RODNEY J , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC: H04B7/02 , H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L1/18 , H04L12/28 , H04L12/56 , H04L25/02 , H04L25/03 , H04L27/00 , H04L27/26 , H04W28/06 , H04W28/20 , H04W28/22 , H04W52/00 , H04W52/42 , H04W52/50 , H04W72/04 , H04W72/12 , H04W74/00 , H04W74/08 , H04W84/12
Abstract: 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 acknowledgement, 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.
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