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公开(公告)号：ES2339955T3
公开(公告)日：2010-05-27
申请号：ES05794158
申请日：2005-09-02
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , MEDVEDEV IRINA , WALTON JAY RODNEY
Abstract: Un procedimiento para recibir datos en un sistema de comunicación inalámbrica, que comprende: obtener símbolos recibidos para una transmisión de datos que comprende por lo menos un flujo de símbolos de datos enviado con diversidad de transmisión espacio-tiempo (STTD); obtener una matriz de respuesta de canal efectiva para la transmisión de datos, en el que la matriz de respuesta de canal efectiva es el producto de la matriz que comprende los factores matriz de respuesta de canal, una matriz diagonal para la formación de haz continua para usar diferentes haces en las subbandas y una matriz de orientación para la propagación espacial para transmitir un símbolo desde antenas de transmisión múltiples simultáneamente; deducir una matriz de filtro espacial con la matriz de respuesta de canal efectiva; y llevar a cabo un procesamiento espacial en los símbolos recibidos con la matriz de filtro espacial para obtener símbolos detectados.
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公开(公告)号：DE60322840D1
公开(公告)日：2008-09-25
申请号：DE60322840
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.
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公开(公告)号：CA2650431A1
公开(公告)日：2007-11-29
申请号：CA2650431
申请日：2007-05-22
Applicant: QUALCOMM INC
Inventor： WALTON J RODNEY , WALLACE MARK S , HOWARD STEVEN J , MEDVEDEV IRINA
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公开(公告)号：BR0307762A
公开(公告)日：2007-01-02
申请号：BR0307762
申请日：2003-02-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY R , KETCHUM JOHN W
Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMISC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.
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公开(公告)号：HK1083283A1
公开(公告)日：2006-06-30
申请号：HK06103245
申请日：2006-03-14
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY ROD , KETCHUM JOHN W
IPC: H04J99/00 , H04B20090101 , H04B7/005 , H04B7/04 , H04J11/00 , H04L20090101 , 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 then performed independently for each group selected for use for data transmission. 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 channel such that all selected channels for the group achieve similar received signal quality (e.g., received SNR).
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Patent Agency Ranking26.发明专利
公开(公告)号：CA2579208A1
公开(公告)日：2006-03-16
申请号：CA2579208
申请日：2005-09-02
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA , WALLACE MARK S
Abstract: A receiving entity obtains received symbols for a data transmission having at least one data symbol stream sent with space-time transmit diversity (STTD). The receiving entity derives an overall channel response matrix in accordance with the STTD encoding scheme used for the data transmission, derives a spatial filter matrix based on the overall channel response matrix, and performs spatial matched filtering on a vector of received symbols for each 2-symbol interval to obtain a vector of detected symbols for the 2-symbol interval. The receiving entity may perform post-processing (e.g., conjugation) on the detected symbols if needed. Alternatively, the receiving entity derives a spatial filter matrix based on an effective channel response matrix, performs spatial matched filtering on the received symbols for each symbol period to obtain detected symbols for that symbol period, and combines multiple estimates obtained for each data symbol sent with STTD.
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27.发明专利
公开(公告)号：HK1078190A1
公开(公告)日：2006-03-03
申请号：HK05110167
申请日：2005-11-14
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY R , KETCHUM JOHN W
Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMISC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.
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公开(公告)号：BR0307054A
公开(公告)日：2005-09-06
申请号：BR0307054
申请日：2003-01-22
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY ROD , KETCHUM JOHN W
Abstract: Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the "poorer" transmission channels without sacrificing the performance of the "better" transmission channels.
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29.发明专利
公开(公告)号：AU2003213217A1
公开(公告)日：2003-09-09
申请号：AU2003213217
申请日：2003-02-19
Applicant: QUALCOMM INC
Inventor： KETCHUM JOHN W , MEDVEDEV IRINA , WALTON JAY R
Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMISC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.
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30.发明专利
公开(公告)号：CA2475515A1
公开(公告)日：2003-08-28
申请号：CA2475515
申请日：2003-02-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , KETCHUM JOHN W , WALTON JAY R
Abstract: Techniques for controlling the transmit power for a number of data streams i n a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed t o achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit pow er for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.
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