公开(公告)号：AU2005207380A1

公开(公告)日：2005-08-04

申请号：AU2005207380

申请日：2005-01-11

Applicant: QUALCOMM INC

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

IPC: H04B7/06 ,  H04J99/00 ,  H04B7/04 ,  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 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.

公开(公告)号：CA2787797A1

公开(公告)日：2005-06-09

申请号：CA2787797

申请日：2004-11-12

Applicant: QUALCOMM INC

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

IPC: H04W74/04 ,  H04B7/02 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36 ,  H04W24/00

Abstract: An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An "effective" uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

公开(公告)号：HK1068465A1

公开(公告)日：2005-04-29

申请号：HK05100463

申请日：2005-01-18

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L20100101 ,  H04L1/00 ,  H04L27/26

Abstract: Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input mutiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals are received via a number of receive antennas, with the received signal from the transmitter unit. The received signals are processed to derive channel state information (CSI) indicative of characteristics of a number of transmission channels used for data transmission. The CSI is transmitted back to the transmitter unit. At the transmitter unit, the CSI from the receiver unit is received and data for transmission to the receiver units is processed based on the received CSI.

公开(公告)号：HK1066655A1

公开(公告)日：2005-03-24

申请号：HK04109559

申请日：2004-12-02

Applicant: QUALCOMM INC

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

IPC: H04B1/14 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L20060101 ,  H04L12/56 ,  H04W16/00 ,  H04W72/04 ,  H04W72/12

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：AU2003287297A1

公开(公告)日：2004-05-13

申请号：AU2003287297

申请日：2003-10-24

Applicant: QUALCOMM INC

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

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 ,  H04L27/00 ,  H04L27/26 ,  H04W16/28 ,  H04W28/20 ,  H04W52/50

Abstract: Pilots suitable for use in MIMO systems and capable of supporting various functions are described. The various types of pilot include-a beacon pilot, a MIMO pilot, a steered reference or steered pilot, and a carrier pilot. The beacon pilot is transmitted from all transmit antennas and may be used for timing and frequency acquisition. The MIMO pilot is transmitted from all transmit antennas but is covered with different orthogonal codes assigned to the transmit antennas. The MIMO pilot may be used for channel estimation. The steered reference is transmitted on specific eigenmodes of a MIMO channel and is user terminal specific. The steered reference may be used for channel estimation. The carrier pilot may be transmitted on designated subbands/antennas and may be used for phase tracking of a carrier signal. Various pilot transmission schemes may be devised based on different combinations of these various types of pilot.

公开(公告)号：CA2756741A1

公开(公告)日：2004-05-06

申请号：CA2756741

申请日：2003-10-27

Applicant: QUALCOMM INC

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

IPC: H04J11/00 ,  H04B7/005 ,  H04B7/02 ,  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: 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. For example, control data may be transmitted using OFDM symbols of a first size, user data may be transmitted using OFDM symbols of the first size and a second size, and pilot data may be transmitted using OFDM symbols of a third size or the first size. In one exemplary design, a small OFDM symbol is utilized for pilot and for transport channels used to send control data, and a large OFDM symbol and the small OFDM symbol are utilized for transport channels used to send user data.

公开(公告)号：CA2502801A1

公开(公告)日：2004-05-06

申请号：CA2502801

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L5/14 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: In one embodiment, pilots are transmitted on the downlink and uplink channel s and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on th e estimates of the downlink and uplink channel responses. A calibrated downlin k channel is formed by using a first set of correction factors for the downlin k channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be perform ed in real-time based on over-the-air transmission.

公开(公告)号：NO20100306A

公开(公告)日：2004-01-06

申请号：NO20100306

申请日：2010-03-04

Applicant: QUALCOMM INC

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

IPC: H04B7/08 ,  H04J99/00 ,  H04B7/06 ,  H04B7/10 ,  H04B7/12 ,  H04L1/00 ,  H04L27/06

CPC classification number: H04B7/0417 ,  H04B7/0626 ,  H04B7/0689 ,  H04B7/0697 ,  H04B7/0854 ,  H04B7/10 ,  H04B7/12 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0071

Abstract: Techniques to 'successively' process received signals at a receiver unit in a MIMO system to recover transmitted data, and to 'adaptively' process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.

公开(公告)号：NO20034981D0

公开(公告)日：2003-11-10

申请号：NO20034981

申请日：2003-11-10

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04L1/00 ,  H04B

Abstract: Techniques to 'successively' process received signals at a receiver unit in a MIMO system to recover transmitted data, and to 'adaptively' process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.

公开(公告)号：AU2002357783A1

公开(公告)日：2003-06-23

申请号：AU2002357783

申请日：2002-12-03

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/04 ,  H04L1/00 ,  H04L25/03 ,  H04L27/26 ,  H04B7/00

Abstract: Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to “precondition” modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.