公开(公告)号：MXPA05009957A

公开(公告)日：2005-12-14

申请号：MXPA05009957

申请日：2004-03-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA

IPC: H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Las tecnicas para seleccionar un modo de transmision adecuado para una transmision de datos en un sistema de comunicacion de multicanal con multiples canales de transmision que tienen SNR variados. En un metodo, una estimacion de SNR se obtiene inicialmente para cada uno de los canales de transmision multiples utilizados para transmitir una corriente de datos. Una SNR promedio y una variacion no desviada entonces se calculan para las estimaciones SNR para los canales de transmision multiple. Se determina un factor de supresion, por ejemplo, basado en la variacion de SNR y un factor de escalado. Una SNR operativa para los canales de transmision se calcula despues basandose en la SNR promedio y el factor de supresion. El modo de transmision entonces se selecciona para la corriente de datos basandose en la SNR operativa. El modo de transmision seleccionado se asocia con una SNR requerida mas alta que es menor que o igual a la SNR operativa. El metodo puede utilizarse para cualquier sistema con canales de transmision multiple que tienen SNR variadas.

公开(公告)号：CA2519631A1

公开(公告)日：2004-10-07

申请号：CA2519631

申请日：2004-03-19

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  MEDVEDEV IRINA

IPC: H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to select a suitable transmission mode for a data transmission in a multi-channel communication system with multiple transmission channels havin g varying SNRs. In one method, an SNR estimate is initially obtained for each of multiple transmission channels used to transmit a data stream. An average SN R and an unbiased variance are then computed for the SNR estimates for the multiple transmission channels. A back-off factor is determined, for example , based on the SNR variance and a scaling factor. An operating SNR for the transmission channels is next computed based on the average SNR and the back - off factor. The transmission mode is then selected for the data stream based on the operating SNR. The selected transmission mode is associated with a highest required SNR that is less than or equal to the operating SNR. The method may be used for any system with multiple transmission channels having varying SNRs.

公开(公告)号：AU2004223374A1

公开(公告)日：2004-10-07

申请号：AU2004223374

申请日：2004-03-19

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  MEDVEDEV IRINA

IPC: H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to select a suitable transmission mode for a data transmission in a multi-channel communication system with multiple transmission channels having varying SNRs. In one method, an SNR estimate is initially obtained for each of multiple transmission channels used to transmit a data stream. An average SNR and an unbiased variance are then computed for the SNR estimates for the multiple transmission channels. A back-off factor is determined, for example, based on the SNR variance and a scaling factor. An operating SNR for the transmission channels is next computed based on the average SNR and the back-off factor. The transmission mode is then selected for the data stream based on the operating SNR. The selected transmission mode is associated with a highest required SNR that is less than or equal to the operating SNR. The method may be used for any system with multiple transmission channels having varying SNRs.

公开(公告)号：CA2496619A1

公开(公告)日：2004-03-11

申请号：CA2496619

申请日：2003-08-19

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06

Abstract: Techniques to perform selective channel inversion per eigenmode in a MIMO system to achieve high spectral efficiency while reducing complexity at both the transmitter and receiver are presented. The available transmission channels are arranged into a number of groups, where each group may include all transmission channels (or frequency bins) for a respective eigenmode of a MIMO channel. The total transmit power is allocated to the groups using a particular group power allocation scheme. Selective channel inversion is the n performed independently for each group selected for use for data transmissio n. For each such group, one or more transmission channels in the group are selected for use, and a scaling factor is determined for each selected chann el such that all selected channels for the group achieve similar received signa l quality (e.g., received SNR).

公开(公告)号：EP1880491A4

公开(公告)日：2012-01-04

申请号：EP06759443

申请日：2006-05-09

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY RODNEY

IPC: H04B7/216 ,  H04L1/00 ,  H04L12/26 ,  H04L25/08 ,  H04L25/52 ,  H04Q1/20

CPC classification number: H04L1/0002 ,  H04B7/0413 ,  H04L1/0015 ,  Y02B60/31 ,  Y02D50/10

Abstract: Rate selection with margin sharing in a system with independent data stream rates is presented. Signal-to-Noise Ratio (SNR) estimates are obtained for each stream. Rates are selected for the streams based on the SNR estimates, such that at least one data stream has an SNR margin below a threshold, each remaining data stream has an SNR margin above a respective threshold, and the total SNR margin for all streams is above a total threshold. For rate selection with margin sharing with a vector-quantized rate set, SNR estimates are obtained for usable transmission channels. The total SNR margin is determined for each rate combination based on the estimates. Each rate combination is associated with a specific number of data streams to transmit, a specific rate for each data stream, and a specific overall throughput. The combination with the highest overall throughput and non-negative total SNR margin is selected.

公开(公告)号：EP1891765A4

公开(公告)日：2011-08-24

申请号：EP06785006

申请日：2006-06-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  MEDVEDEV IRINA

IPC: H04J11/00

CPC classification number: H04L1/0009 ,  H04L1/0003 ,  H04L1/06 ,  Y02D50/10

Abstract: Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.

公开(公告)号：ES2715398T3

公开(公告)日：2019-06-04

申请号：ES14197245

申请日：2006-06-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  MEDVEDEV IRINA

IPC: H04J11/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06

Abstract: Un aparato, que comprende: un procesador operativo para determinar estimaciones de canal para una pluralidad de flujos de datos que se enviarán a un único receptor; y un controlador operativo para seleccionar una única velocidad de código para la pluralidad de flujos de datos y una pluralidad de esquemas de modulación para la pluralidad de flujos de datos basándose en las estimaciones de canal, en el que el controlador está operativo para seleccionar una velocidad de código entre una pluralidad de velocidades de código admitidas por el sistema y para proporcionar la velocidad de código como la velocidad de código única para codificar la pluralidad de flujos de datos y en el que cada una de la pluralidad de velocidades de código está asociada con un conjunto respectivo de esquemas de modulación, y en el que el controlador está operativo para seleccionar un esquema de modulación para cada uno de la pluralidad de flujos de datos entre el conjunto de esquemas de modulación asociados con la velocidad de código única.

公开(公告)号：CA2628742C

公开(公告)日：2013-02-05

申请号：CA2628742

申请日：2006-11-20

Applicant: QUALCOMM INC

Inventor： BJERKE BJORN ,  MEDVEDEV IRINA ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: H04B7/08 ,  H04B7/04 ,  H04L1/06 ,  H04L25/03

Abstract: Techniques for performing detection and decoding at a receiver are described. In one scheme, the receiver obtains R received symbol streams for M data streams transmitted by a transmitter, performs receiver spatial processing on the received symbols to obtain detected symbols, performs log-likelihood ratio (LLR) computation independently for each of D best data streams, and performs LLR computation jointly for the M-D remaining data streams, where M >= D >= 1 and M > 1. The D best data streams may be selected based on SNR and/or other criteria. In another scheme, the receiver performs LLR computation independently for each of the D best data streams, performs LLR computation jointly for the M-D remaining data streams, and reduces the number of hypotheses to consider for the joint LLR computation by performing a search for candidate hypotheses using list sphere detection, Markov chain Monte Carlo, or some other search technique.

公开(公告)号：CA2477536C

公开(公告)日：2012-11-13

申请号：CA2477536

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY R ,  WALLACE MARK

IPC: H04B7/06 ,  H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a "beam-forming" transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a "multi-mode" transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

公开(公告)号：RU2384957C2

公开(公告)日：2010-03-20

申请号：RU2008101647

申请日：2006-06-15

Applicant: QUALCOMM INC

Inventor： UOLTON DZHEJ RODNI ,  MEDVEDEV IRINA

IPC: H04J99/00 ,  H04L1/02

Abstract: Изобретениеотноситсяк техникесвязии можетбытьиспользованодляпередачимножествапотоковданныхв системахсвязи. Дляпередачинесколькихпотоковданныхв одинприемникиспользуютединуюскоростькодированияи различныесхемымодуляции, приэтомдлянесколькихпотоковданныхопределяютоценкиканала, которыеиспользуютдлявыбораединойскоростикодированияи несколькихсхеммодуляциидлянесколькихпотоковданных. Системаможетподдерживатьнаборскоростейкодирования, икаждуюскоростькодированияможноассоциироватьс соответствующимнаборомсхеммодуляции, которыеможноиспользоватьс этойскоростьюкодирования. Изнабораподдерживаемыхскоростейкодированиявыбираютединуюскоростькодированиядлявсехпотоковданныхи длякаждогопотокаданныхвыбираютсхемумодуляцииизнаборасхеммодуляции, ассоциированногос этойединойскоростьюкодирования. Несколькопотоковданныхкодируютсогласноединойскоростикодирования. Далеекаждыйпотокданныхмодулируютсогласносхемемодуляции, выбраннойдляэтогопотока. Техническийрезультат - упрощениевыбораскоростии/илисокращениеколичествапередаваемойинформациио скоростии улучшениехарактеристикпередачиданных. 7 н. и 36 з.п. ф-лы, 5 ил., 4 табл.