Method and apparatus for processing data in a multiple-input multiple-output (mimo) communication system utilizing channel state information

    公开(公告)号:AU2002309674B8

    公开(公告)日:2002-11-25

    申请号:AU2002309674

    申请日:2002-05-07

    Applicant: QUALCOMM INC

    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.

    Transmission in multi-channel communication system using selective channel power control

    公开(公告)号:AU2002259221A1

    公开(公告)日:2002-11-25

    申请号:AU2002259221

    申请日:2002-05-17

    Applicant: QUALCOMM INC

    Abstract: Techniques are provided to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by "inverting" the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power is distributed across only "good" channels. Inproved performance is achieved due to the combined benefits of using only the best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

    183.
    发明专利
    未知

    公开(公告)号:BR9914245A

    公开(公告)日:2002-02-05

    申请号:BR9914245

    申请日:1999-10-01

    Applicant: QUALCOMM INC

    Abstract: A method and apparatus for controlling the transmission of signals from one or more of a plurality of mobile stations (1300) to a base station (1400) on a plurality of M multiple access channels. A power control information packet formed from a plurality of power control bits is transmitted from the base station (1400) to the one or more mobile stations (1300). Each of the power control bits in the power control information packet has a position that is mapped to a selected access channel and to a time offset within the selected access channel. The power control information packet is received at a first mobile station (1300). A message is then transmitted from the first mobile station (1300) to the base station (1400) on a first access channel and at a first time offset associated with the first access channel. The message is transmitted from the first mobile station (1300) at a power level determined in response to a first power control bit in the power control information packet. The first power control bit is located in a first position in the power control information packet, the first position being mapped to the first access channel and the first time offset.

    Procedimiento y transmisor para transmisión de emisión con ensanchamiento espacial en un sistema de comunicación de múltiples antenas

    公开(公告)号:ES2633309T3

    公开(公告)日:2017-09-20

    申请号:ES10177176

    申请日:2004-12-13

    Applicant: QUALCOMM INC

    Abstract: Un procedimiento de emisión de datos desde un transmisor de múltiples antenas inalámbrico, que comprende: seleccionar al menos dos matrices de dirección para la transmisión de al menos un bloque de símbolos de datos obtenido a partir de al menos un bloque de datos, en el que se proporcionan las al menos dos matrices de dirección para aleatorizar un canal efectivo observado por cada una de una pluralidad de entidades de recepción para el al menos un bloque de símbolos de datos; realizar un procesamiento espacial en el al menos un bloque de símbolos de datos con cada una de las al menos dos matrices de dirección para obtener una pluralidad de secuencias de símbolos de transmisión, en el que el procesamiento espacial comprende obtener símbolos de transmisión para ser enviados desde una pluralidad de antenas de punto de acceso en un tramo de transmisión mediante el procesamiento de símbolos de datos para ser enviados en el tramo de transmisión con una matriz de dirección seleccionada para el tramo de transmisión; y emitir una o más señales que comprenden la pluralidad de secuencias de símbolos de transmisión desde una pluralidad de antenas de transmisión.

    Calibración de respuestas de canal de enlace descendente y de enlace ascendente en un sistema de comunicación inalámbrica MIMO

    公开(公告)号:ES2561466T3

    公开(公告)日:2016-02-26

    申请号:ES05723308

    申请日:2005-02-18

    Applicant: QUALCOMM INC

    Abstract: Un procedimiento de calibración de canales de enlace descendente y de enlace ascendente en un sistema de comunicación inalámbrica de entradas múltiples y salidas múltiples, MIMO, que comprende: obtener una primera matriz de transmisión en base a una primera señal piloto recibida mediante un canal MIMO entre una entidad transmisora y una entidad receptora; estando dicho procedimiento caracterizado por obtener una segunda matriz de transmisión en base a una estimación de respuesta de canal MIMO y a matrices de errores de calibración, primera y segunda, siendo la estimación de respuesta de canal MIMO una estimación de una respuesta del canal MIMO y obtenida en base a una segunda señal piloto recibida mediante el canal MIMO, conteniendo la primera matriz de errores de calibración estimaciones de errores en una primera matriz de corrección usada para dar cuenta de las respuestas de cadenas de transmisión y recepción en la entidad transmisora, y conteniendo la segunda matriz de errores de calibración estimaciones de errores en una segunda matriz de corrección usada para dar cuenta de las respuestas de cadenas de transmisión y recepción en la entidad receptora; y revisar las matrices de errores de calibración, primera y segunda, en base a las matrices de transmisión primera y segunda.

    PHASE CORRECTION FOR OFDM AND MIMO TRANSMISSIONS

    公开(公告)号:CA2844937C

    公开(公告)日:2015-02-10

    申请号:CA2844937

    申请日:2007-05-22

    Applicant: QUALCOMM INC

    Abstract: Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

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