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121.
公开(公告)号:UA89609C2
公开(公告)日:2010-02-25
申请号:UA2005000570
申请日:2003-06-20
Applicant: QUALCOMM INC
Inventor: KETCHUM JOHN W , WALTON JAY R
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公开(公告)号:AU2003284943C1
公开(公告)日:2009-07-23
申请号:AU2003284943
申请日:2003-10-27
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , HOWARD STEVEN J , KETCHUM JOHN W , WALLACE MARK
IPC: H04L1/00 , H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , 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.
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公开(公告)号:AU2003243681C1
公开(公告)日:2009-07-02
申请号:AU2003243681
申请日:2003-06-20
Applicant: QUALCOMM INC
Inventor: KETCHUM JOHN W , WALTON JAY R
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公开(公告)号:AU2003287297B2
公开(公告)日:2009-05-07
申请号:AU2003287297
申请日:2003-10-24
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , KETCHUM JOHN W , WALLACE MARK , HOWARD STEVEN J
IPC: H04L1/06 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , 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.
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125.
公开(公告)号:AU2003243679B2
公开(公告)日:2009-02-26
申请号:AU2003243679
申请日:2003-06-20
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , KETCHUM JOHN W
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.
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公开(公告)号:ES2309303T3
公开(公告)日:2008-12-16
申请号:ES03709263
申请日:2003-02-19
Applicant: QUALCOMM INC
Inventor: MEDVEDEV IRINA , WALTON JAY R , KETCHUM JOHN W
Abstract: Un procedimiento para controlar la energía de transmisión con respecto a una serie de secuencias de datos en un sistema de comunicación MIMO (100) (múltiple entrada, múltiple salida), que comprende: procesamiento de múltiples secuencias de símbolos recibidos, de acuerdo con una técnica de procesamiento espacial en el receptor con el fin de proveer múltiples secuencias de datos detectadas, caracterizado porque el procedimiento, además, comprende la estimación de las relaciones señal-ruido e interferencias (SNR) correspondientes a las múltiples secuencias de datos detectadas, donde las SNR se calculan a partir de la técnica de procesamiento espacial en el receptor (608, 732); identificación de cada una de las relaciones SNR que supera un punto de referencia (314, 614, 714); y determinación de una energía de transmisión ajustada para cada una de las secuencias de datos detectadas en asociación con una relación SNR que supere el punto de referencia (316, 616, 716).
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127.
公开(公告)号:ES2284899T3
公开(公告)日:2007-11-16
申请号:ES02753807
申请日:2002-03-22
Applicant: QUALCOMM INC
Inventor: LING FUNYUN , WALTON JAY R , HOWARD STEVEN J , WALLACE MARK , KETCHUM JOHN W
Abstract: Un procedimiento para transmitir datos desde una unidad transmisora a una unidad receptora en un sistema de comunicación de múltiple entrada y múltiple salida (MIMO), que comprende: en la unidad receptora, recibir una pluralidad de señales a través de una pluralidad de antenas de recepción, en la que la señal recibida desde cada antena de recepción comprende una combinación de una o más señales transmitidas desde la unidad transmisora, procesar la señales recibidas para obtener información de estado de canal (CSI) indicativa de características de una pluralidad de canales de transmisión utilizados para la transmisión de datos, y transmitir la CSI de vuelta a la unidad transmisora; y en la unidad transmisora, recibir la CSI desde la unidad receptora, y procesar datos para su transmisión a la unidad receptora basándose en la CSI recibida, caracterizado porque la CSI presentada comprende estimaciones de la relación señal/ruido más interferencia (SNR) para cada uno de la pluralidad de canales de transmisión, y en el que el procesamiento en la unidad transmisora incluye datos de codificación para cada canal de transmisión basándose en la estimación de la SNR para el canal de transmisión.
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公开(公告)号:AU2001249379B2
公开(公告)日:2007-02-01
申请号:AU4937901
申请日:2001-03-20
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , HOLTZMAN JACK , WALLACE MARK , ANTONIO FRANKLIN P
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公开(公告)号:HK1078389A1
公开(公告)日:2006-03-10
申请号:HK05110280
申请日:2005-11-17
Applicant: QUALCOMM INC
Inventor: MEDVEDEV IRINA , WALTON JAY R , WALLACE MARK
IPC: H04J99/00 , H04B20090101 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04J11/00 , H04L20090101 , 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.
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公开(公告)号:BRPI0406645A
公开(公告)日:2005-12-06
申请号:BRPI0406645
申请日:2004-01-07
Applicant: QUALCOMM INC
Inventor: SMEE JOHN E , MALLADI DURGA P , WALTON JAY R , WILLENEGGER SERGE
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