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公开(公告)号：BR0313819A
公开(公告)日：2007-09-11
申请号：BR0313819
申请日：2003-08-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY ROD , KETCHUM JOHN W
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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公开(公告)号：DE60310237T2
公开(公告)日：2007-06-28
申请号：DE60310237
申请日：2003-08-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON ROD , KETCHUM W
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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公开(公告)号：BRPI0408497A
公开(公告)日：2006-05-09
申请号：BRPI0408497
申请日：2004-03-19
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , MEDVEDEV IRINA
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.
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公开(公告)号：AU2003213214A1
公开(公告)日：2003-09-09
申请号：AU2003213214
申请日：2003-02-19
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY R , WALLACE MARK
IPC: H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , 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：CA2477536A1
公开(公告)日：2003-09-04
申请号：CA2477536
申请日：2003-02-19
Applicant: QUALCOMM INC
Inventor： WALLACE MARK , WALTON JAY R , MEDVEDEV IRINA
IPC: H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , 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-CS I 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 bes t 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 rang e of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment wou ld then be dependent on the specific operating condition experienced by the system at that moment.
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Patent Agency Ranking
公开(公告)号：CA2473917A1
公开(公告)日：2003-07-31
申请号：CA2473917
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 transmi t 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 transmissio n channels operated below the saturation region. In this way, higher data rate may be achieved for the "poorer" transmission channels without sacrificing t he performance of the "better" transmission channels.
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公开(公告)号：WO03058871A8
公开(公告)日：2003-11-13
申请号：PCT/US0241756
申请日：2002-12-31
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , KETCHUM JOHN W , WALLACE MARK , MEDVEDEV IRINA
CPC classification number: H04L5/0023 , H04L1/06 , H04L5/0042 , H04L5/0044 , H04L5/0058 , H04L5/006
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.
Abstract translation: 在MIMO-OFDM系统中分配用于数据传输的终端的技术。 调度器形成用于多个频带中的每一个的数据传输的称为假设的终端集合。 可以针对每个假设进一步形成一个或多个子假设，其中每个子假设对应于（1）假设中的发射天线到终端的特定分配，或者（2）用于处理 来自终端的上行链路数据传输。 然后评估每个子假设的性能。 然后根据所评估的性能为每个频带选择一个子假设，然后调度每个选择的子假设中的终端集合以在相应的频带上进行数据传输。
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公开(公告)号：HUE041892T2
公开(公告)日：2019-06-28
申请号：HUE14197245
申请日：2006-06-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA
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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
Inventor： WALTON J RODNEY , WALLACE MARK S , MEDVEDEV IRINA , HOWARD STEVEN J
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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公开(公告)号：AT548877T
公开(公告)日：2012-03-15
申请号：AT07019187
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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