公开(公告)号：CA2446930A1

公开(公告)日：2002-11-21

申请号：CA2446930

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 (106) in a wireless communication system. In one method, a number of sets of terminals (100) 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 o n channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the select ed 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 terminal s in each set may be formed, with each terminal ordering corresponding to a su b- hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypotheses is selected.

公开(公告)号：ES2842625T3

公开(公告)日：2021-07-14

申请号：ES10175654

申请日：2002-12-31

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  KETCHUM JOHN W ,  WALLACE MARK ,  MEDVEDEV IRINA

IPC: H04L5/00 ,  H04J99/00 ,  H04L1/06 ,  H04L5/02

Abstract: Un procedimiento para comunicación inalámbrica, que comprende: seleccionar (514) una pluralidad de conjuntos de terminales para una posible transmisión de datos en un recurso, incluyendo cada conjunto más de un terminal, siendo cada conjunto de terminales diferente; donde el procedimiento comprende las etapas de: evaluar (520) una métrica de rendimiento de cada uno de la pluralidad de conjuntos de terminales; seleccionar (528) un conjunto de terminales entre la pluralidad de conjuntos de terminales en base al rendimiento métrico de rendimiento evaluado de cada conjunto de terminales; y planificar (536) cada terminal del conjunto seleccionado de terminales para la transmisión de datos en el recurso.

公开(公告)号：CA2472574C

公开(公告)日：2013-07-23

申请号：CA2472574

申请日：2002-12-31

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  KETCHUM JOHN W ,  WALLACE MARK ,  MEDVEDEV IRINA

IPC: H04L1/06 ,  H04J99/00 ,  H04L5/02

Abstract: Techniques to assign terminals for data transmission in a MIMO-OFDM system. A scheduler forms sets of terminals, called a hypothesis, for data transmission for each of a number of frequency bands. One or more sub-hypotheses may be further formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis, or, (2) a specific order for processing the uplink data transmissions from the terminal(s). The performance of each sub-hypothesis is then evaluated. One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and, the set of terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.

公开(公告)号：ES2292940T3

公开(公告)日：2008-03-16

申请号：ES03707488

申请日：2003-01-22

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY ROD ,  KETCHUM JOHN W

IPC: H04B7/005 ,  H04J99/00 ,  H04W24/00 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34 ,  H04W52/50 ,  H04W72/00

Abstract: Un procedimiento para asignar potencia de transmisión a una pluralidad de canales de transmisión en un sistema comunicación inalámbrica, que comprende: definir (214) un conjunto de uno o más canales de transmisión correspondientes a subcanales espaciales a los que se les va a asignar potencia de transmisión; determinar (218) una potencia de transmisión total disponible para asignar a los canales de transmisión en el conjunto; asignar (220) la potencia de transmisión total a los canales de transmisión en el conjunto basándose en un esquema de asignación particular; identificar (222) canales de transmisión con una potencia en una región de saturación que resulta de la potencia de transmisión asignada; reasignar (226) a cada canal de transmisión en la región de saturación una cantidad revisada de potencia de transmisión; determinar (228) un exceso de potencia de transmisión por encima del umbral de saturación para todos los canales de transmisión a los que se ha asignado cantidades revisadas de potencia de transmisión; y realizar la definición, determinación, asignación, identificación, y reasignación para una o más iteraciones, en donde el conjunto de canales de transmisión para una primera iteración incluye la pluralidad de canales de transmisión y para cada iteración posterior incluye canales de transmisión que no están en la región de saturación, y en el que la potencia de transmisión total disponible para cada iteración posterior incluye el exceso de potencia de transmisión total en una iteración actual.

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：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：NO20050351L

公开(公告)日：2005-03-18

申请号：NO20050351

申请日：2005-01-21

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  KETCHUM JOHN W

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

Abstract: Techniques for processing a data transmission at a transmitter and receiver, which use channel eigen-decomposition, channel inversion, and (optionally) 'water-pouring'. At the transmitter, (1) channel eigen-decomposition is performed to determine eigenmodes of a MIMO channel and to derive a first set of steering vectors, (2) channel inversion is performed to derive weights ( e . g ., one set for each eigenmode) used to minimize ISI distortion, and (3) water-pouring may be performed to derive scaling values indicative of the transmit powers allocated to the eigenmodes. The first set of steering vectors, weights, and scaling values are used to derive a pulse-shaping matrix, which is used to precondition modulation symbols prior to transmission. At the receiver, channel eigen-decomposition is performed to derive a second set of steering vectors, which are used to derive a pulse-shaping matrix used to condition received symbols such that orthogonal symbol streams are recovered.

公开(公告)号：BR0210417A

公开(公告)日：2004-07-20

申请号：BR0210417

申请日：2002-06-13

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON JAY ROD

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：AU2003290821A1

公开(公告)日：2004-06-15

申请号：AU2003290821

申请日：2003-11-12

Applicant: QUALCOMM INC

Inventor： BJERKE BJORN ,  KETCHUM JOHN W ,  SINDHUSHAYANA NAGABHUSHANA ,  WALTON JAY ROD

IPC: H03M13/00 ,  H03M13/11 ,  H04L1/00

Abstract: Method and apparatus for generating codewords with variable length and redundancy from a single Low-Density Parity-Check (LDPC) code with variable length input words. A mother code for encoding data words is generated based on a parity-check matrix, wherein the mother code is adjusted to reflect the size of the data word to be encoded. A generator matrix applies the mother code to data words to produce codewords for transmission. In one embodiment, a reduction criteria is determined and the size of the generator matrix reduced in response. The corresponding parity-check matrix is applied at the receiver for decoding the received codeword.

公开(公告)号：CA2505057A1

公开(公告)日：2004-06-03

申请号：CA2505057

申请日：2003-11-12

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  SINDHUSHAYANA NAGABHUSHANA ,  BJERKE BJORN ,  KETCHUM JOHN W

IPC: H03M13/00 ,  H03M13/11 ,  H04L1/00

Abstract: Method and apparatus for generating codewords with variable length and redundancy from a single Low-Density Parity-Check (LDPC) code with variable length input words. A mother code for encoding data words is generated based on a parity-check matrix, wherein the mother code is adjusted to reflect the size of the data word to be encoded. A generator matrix applies the mother code to data words to produce codewords for transmission. In one embodiment, a reduction criteria is determined and the size of the generator matrix reduce d in response. The corresponding parity-check matrix is applied at the receive r for decoding the received codeword.