公开(公告)号：AU2003243681B2

公开(公告)日：2009-01-22

申请号：AU2003243681

申请日：2003-06-20

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON JAY R

IPC: H04J11/00 ,  H04B1/00 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

公开(公告)号：DE60220783D1

公开(公告)日：2007-08-02

申请号：DE60220783

申请日：2002-05-15

Applicant: QUALCOMM INC

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

IPC: H04L1/06 ,  H04B7/04 ,  H04B7/06 ,  H04J99/00 ,  H04L1/00 ,  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：DE60219605D1

公开(公告)日：2007-05-31

申请号：DE60219605

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: 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：BR0312090A

公开(公告)日：2007-05-29

申请号：BR0312090

申请日：2003-06-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  KETCHUM JOHN W

IPC: H04B7/04 ,  H04J11/00 ,  H04B1/00 ,  H04B7/02 ,  H04B7/06 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

公开(公告)号：AU2002309674B2

公开(公告)日：2007-02-15

申请号：AU2002309674

申请日：2002-05-07

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04L1/00

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：AU2001245921B2

公开(公告)日：2006-11-23

申请号：AU2001245921

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： JALALI AHMAD ,  WALTON JAY R ,  WALLACE MARK

IPC: H04B17/00 ,  H04J11/00 ,  H04B1/707 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04W52/08 ,  H04W52/42

Abstract: The invention relates to a method for transmitting pilot signals used for measuring and reporting channel state information, CSI, in a multiple input/multiple output, MIMO, system, comprising: generating a pilot sequence by using a maximal-length shift register sequence, m-sequence; assigning a different shift to multiple transmit antennas, wherein the value of the shift is dependent on at least one characteristic of the communication channel; generating a pilot signal at each transmit antenna by shifting the pilot sequence by the value specified by the shift; and transmitting the pilot signal via the transmit antenna.

公开(公告)号：AT344553T

公开(公告)日：2006-11-15

申请号：AT02737509

申请日：2002-06-13

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON JAY R

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L5/06 ,  H04L25/03 ,  H04L27/26

Abstract: Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and modulated based on a particular coding and modulation scheme to provide modulation symbols, and the modulation symbols for each selected channel are weighted based on an assigned weight. The weighting "inverts" the selected channels such that they achieve similar received SNRs. With selective channel inversion, only "good" channels in each group having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power for the group is distributed across the good channels in the group. Improved performance is achieved by using only good channels in each group and matching each selected channel's received SNR to the required SNR.

公开(公告)号：HK1084266A1

公开(公告)日：2006-07-21

申请号：HK06104309

申请日：2006-04-10

Applicant: QUALCOMM INC

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

IPC: H04L20060101 ,  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：AT327599T

公开(公告)日：2006-06-15

申请号：AT02749680

申请日：2002-06-25

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  KETCHUM JOHN W

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L5/06 ,  H04L25/03 ,  H04L27/26 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34 ,  H04W52/42 ,  H04W52/50 ,  H04Q7/38

Abstract: Techniques to select transmission channels for use for data transmission and to process and transmit data over the selected transmission channels. Transmission channels available for use are segregated into one or more groups, with each group including any number of channels. With selective channel transmission, only "good" channels in each group are selected (e.g., based on the channels' received SNRs and an SNR threshold), "bad" channels are not used, and the total available transmit power for the group is (e.g., uniformly) distributed across only the good channels. Each group may also be associated with a respective coding and modulation scheme, and data for each group may be coded and modulated based on the scheme selected for the group. Improved performance is achieved by using only good channels in each group and matching the data processing for the selected channels to the capacity achievable by the channels.

公开(公告)号：BR0208312A

公开(公告)日：2006-02-21

申请号：BR0208312

申请日：2002-03-22

Applicant: QUALCOMM INC

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

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

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.