公开(公告)号：CA2566330A1

公开(公告)日：2005-12-01

申请号：CA2566330

申请日：2005-04-29

Applicant: QUALCOMM INC

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

IPC: H04B7/06 ,  H04J99/00 ,  H04B7/04 ,  H04L5/02 ,  H04L27/26

公开(公告)号：BR0315520A

公开(公告)日：2005-09-27

申请号：BR0315520

申请日：2003-10-27

Applicant: QUALCOMM INC

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

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

Abstract: For transmit diversity in a multi-antenna OFDM system, a transmitter encodes, interleaves, and symbol maps traffic data to obtain data symbols. The transmitter processes each pair of data symbols to obtain two pairs of transmit symbols for transmission from a pair of antennas either (1) in two OFDM symbol periods for space-time transmit diversity or (2) on two subbands for space-frequency transmit diversity. NT·(NT−1)/2 different antenna pairs are used for data transmission, with different antenna pairs being used for adjacent subbands, where NT is the number of antennas. The system may support multiple OFDM symbol sizes. The same coding, interleaving, and modulation schemes are used for different OFDM symbol sizes to simplify the transmitter and receiver processing. The transmitter performs OFDM modulation on the transmit symbol stream for each antenna in accordance with the selected OFDM symbol size. The receiver performs the complementary processing.

公开(公告)号：CA2556710A1

公开(公告)日：2005-09-01

申请号：CA2556710

申请日：2005-02-18

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04L25/03 ,  H04B7/04 ,  H04B7/06 ,  H04B17/00

公开(公告)号：CA2553322A1

公开(公告)日：2005-08-04

申请号：CA2553322

申请日：2005-01-11

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04L1/06 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L1/02

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 Ns data symbol streams for transmission on Ns transmission channels of a MIMO channel, (3) spatially spreads the Ns data symbol streams with steering matrices, and (4) spatially processes Ns spread symbol streams for full-CSI transmission on Ns eigenmode s or partial-CSI transmission on Ns spatial channels of the MIMO channel. A receiving entity (1) obtains NR received symbol streams via NR receive antennas, (2) performs receiver spatial processing for full-CSI or partial-C SI transmission to obtain Ns detected symbol streams, (3) spatially despreads t he Ns detected symbol streams with the same steering matrices used by the transmitting entity to obtain Ns recovered symbol streams, and (4) demodulat es and decodes each recovered symbol block to obtain a corresponding decoded da ta packet.

公开(公告)号：BR0313817A

公开(公告)日：2005-08-02

申请号：BR0313817

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： MENON MURALI PARAVATH ,  KETCHUM JOHN W ,  WALLACE MARK ,  WALTON JAY ROD ,  HOWARD STEVEN J

IPC: H04J99/00 ,  H01Q3/26 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L27/26

Abstract: Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scaling value is then obtained for each subband based on its allocated transmit power. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steering vector. A stream of preconditioned symbols is then formed for each transmit antenna.

公开(公告)号：CA2549100A1

公开(公告)日：2005-06-30

申请号：CA2549100

申请日：2004-12-13

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04L25/03 ,  H04B7/005 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04B7/12 ,  H04L1/02

Abstract: An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an "effective" channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain ND data symbol blocks to be broadcast in NM transmission spans, where ND >=1 and NM > 1. The ND data symbol 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 matrice s) 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 broadcast via NT transmit antennas and in one transmission span to user terminals within a broadcast coverage area.

公开(公告)号：CA2546749A1

公开(公告)日：2005-06-09

申请号：CA2546749

申请日：2004-11-12

Applicant: QUALCOMM INC

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

IPC: H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36

公开(公告)号：HK1065665A1

公开(公告)日：2005-02-25

申请号：HK04108306

申请日：2004-10-21

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04B7/04 ,  H04B7/06 ,  H04J99/00 ,  H04L20100101 ,  H04L1/00 ,  H04L1/06 ,  H04W16/00 ,  H04W16/28 ,  H04W84/14

Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.

公开(公告)号：BR0209636A

公开(公告)日：2004-08-31

申请号：BR0209636

申请日：2002-05-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04B7/04 ,  H04B7/06 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04W16/00 ,  H04W16/28 ,  H04W84/14

Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.

公开(公告)号：AU2003287326A1

公开(公告)日：2004-05-13

申请号：AU2003287326

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/28 ,  H04W52/50

Abstract: A user terminal supports multiple spatial multiplexing (SM) modes such as a steered mode and a non-steered mode. For data transmission, multiple data streams are coded and modulated in accordance with their selected rates to obtain multiple data symbol streams. These streams are then spatially processed in accordance with a selected SM mode (e.g., with a matrix of steering vectors for the steered mode and with the identity matrix for the non-steered mode) to obtain multiple transmit symbol streams for transmission from multiple antennas. For data reception, multiple received symbol streams are spatially processed in accordance with the selected SM mode ( e.g ., with a matrix of eigenvectors for the steered mode and with a spatial filter matrix for the non-steered mode) to obtain multiple recovered data symbol streams. These streams are demodulated and decoded in accordance with their selected rates to obtain multiple decoded data streams.