公开(公告)号：ES2284899T3

公开(公告)日：2007-11-16

申请号：ES02753807

申请日：2002-03-22

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  WALTON JAY R ,  HOWARD STEVEN J ,  WALLACE MARK ,  KETCHUM JOHN W

IPC: H04B7/00 ,  H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L27/26

Abstract: Un procedimiento para transmitir datos desde una unidad transmisora a una unidad receptora en un sistema de comunicación de múltiple entrada y múltiple salida (MIMO), que comprende: en la unidad receptora, recibir una pluralidad de señales a través de una pluralidad de antenas de recepción, en la que la señal recibida desde cada antena de recepción comprende una combinación de una o más señales transmitidas desde la unidad transmisora, procesar la señales recibidas para obtener información de estado de canal (CSI) indicativa de características de una pluralidad de canales de transmisión utilizados para la transmisión de datos, y transmitir la CSI de vuelta a la unidad transmisora; y en la unidad transmisora, recibir la CSI desde la unidad receptora, y procesar datos para su transmisión a la unidad receptora basándose en la CSI recibida, caracterizado porque la CSI presentada comprende estimaciones de la relación señal/ruido más interferencia (SNR) para cada uno de la pluralidad de canales de transmisión, y en el que el procesamiento en la unidad transmisora incluye datos de codificación para cada canal de transmisión basándose en la estimación de la SNR para el canal de transmisión.

公开(公告)号：BRPI0417675A

公开(公告)日：2007-03-20

申请号：BRPI0417675

申请日：2004-12-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  ZHENG LIZHONG ,  KETCHUM JOHN W ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04J99/00 ,  H04L1/06

Abstract: Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in NM transmission spans, where ND≥1 and NM>1. The ND blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.

公开(公告)号：HK1091615A1

公开(公告)日：2007-01-19

申请号：HK06107773

申请日：2006-07-11

Applicant: QUALCOMM INC

Inventor： WALTON RODNEY J ,  WALLACE MARK S ,  KETCHUM JOHN W ,  HOWARD STEVEN J

IPC: 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.

公开(公告)号：AR050795A1

公开(公告)日：2006-11-22

申请号：ARP050103715

申请日：2005-09-05

Applicant: QUALCOMM INC

Inventor： WALTON RODNEY J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04J99/00 ,  H04B7/06 ,  H04L1/06

Abstract: Técnicas para transmitir datos utilizando una combinacion de esquemas de diversidad de transmision. Estos esquemas de diversidad de transmision incluyen la distribucion espacial, formacion continua de haces, diversidad de retraso cíclico, diversidad de transmision de espacio-tiempo (STTD), diversidad de transmision de espacio-frecuencia (SFTF), y diversidad de transmision ortogonal (OTD). Una entidad de transmision procesa una o más (ND) corrientes de símbolos de datos basándose en un esquema de diversidad de transmision (es decir, STF, SFTD, o OTD) para generar multiples (NC) corrientes de símbolos codificados. Cada corriente de símbolos de datos puede ser enviada como una unica corriente de símbolos de datos codificados, o como multiples (por ejemplo, dos) corrientes de símbolos de datos codificados utilizando STTD, SFTD, o OTD. La entidad de transmision puede llevar a cabo una distribucion espacial sobre las NC corrientes de símbolos codificados con diferentes matrices, para generar multiples (NT) corrientes de símbolos de transmision para su transmision desde NT antenas. De forma adicional, o como una alternativa, la entidad de transmision puede llevar a cabo una formacion continua de haces sobre las NT corrientes de símbolos de transmision en el dominio de tiempo o el dominio de frecuencia.

公开(公告)号：BR0209641A

公开(公告)日：2006-11-14

申请号：BR0209641

申请日：2002-05-14

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04B1/14 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L12/56 ,  H04W16/00 ,  H04W72/04 ,  H04W72/12 ,  H04B7/02 ,  H04J15/00 ,  H04Q7/38

Abstract: Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypothcses is selected.

公开(公告)号：CA2588179A1

公开(公告)日：2006-05-18

申请号：CA2588179

申请日：2005-11-15

Applicant: QUALCOMM INC

Inventor： HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: G06F17/16 ,  H04J99/00

公开(公告)号：CA2562055A1

公开(公告)日：2005-11-03

申请号：CA2562055

申请日：2005-03-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04B7/06 ,  H04J99/00 ,  H04L25/03 ,  H04L27/26

Abstract: Techniques for generating and using steering matrices for pseudo-random transmit steering (PRTS) are described. For PRTS, a transmitting entity performs spatial processing with steering matrices so that a data transmissi on observes an ensemble of "effective" channels formed by the actual channel us ed for data transmission and the steering matrices used for PRTS. The steering matrices may be generated by selecting a base matrix, which may be a Walsh matrix or a Fourier matrix. Different combinations of scalars are then selected, with each combination including at least one scalar for at least o ne row of the base matrix. Each scalar may be a real or complex value (e.g., +1 , - 1, +j, or -j, where j=.sqroot.1). Different steering matrices are generated by multiplying the base matrix with each of the different combinations of scalars. The steering matrices are different permutations of the base matrix .

公开(公告)号：AU2005222327A1

公开(公告)日：2005-09-22

申请号：AU2005222327

申请日：2005-03-03

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  NANDA SANJIV ,  KETCHUM JOHN W ,  HOWARD STEVEN J ,  WALLACE MARK S

IPC: H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04L27/26

Abstract: A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across a packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission. Other aspects, embodiments, and features are also claimed and disclosed.

公开(公告)号：CA2747273A1

公开(公告)日：2005-09-01

申请号：CA2747273

申请日：2005-02-18

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK S ,  HOWARD STEVEN J ,  NANDA SANJIV

IPC: H04B7/06 ,  H04B7/04 ,  H04J11/00 ,  H04J99/00 ,  H04L1/06 ,  H04L25/02 ,  H04L27/26 ,  H04W24/10

Abstract: A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. The PRTS mode may be used to achieve transmit diversity or spatial spreading. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across an entire packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission.

公开(公告)号：BR0315540A

公开(公告)日：2005-08-23

申请号：BR0315540

申请日：2003-10-27

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50

Abstract: Techniques to use OFDM symbols of different sizes to achieve greater efficiency for OFDM systems. The system traffic may be arranged into different categories (e.g., control data, user data, and pilot data). For each category, one or more OFDM symbols of the proper sizes may be selected for use based on the expected payload size for the traffic in that category. In a further aspect, the channel response matrix for each of a plurality of subbands is decomposed in a manner to avoid arbitrary phase rotations from subband to subband by constraining the first element in each column of the first unitary matrix to be a non-negative value. In another aspect, steering vectors are interpolated between subbands.