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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：HK1084515A1
公开(公告)日：2006-07-28
申请号：HK06102843
申请日：2006-03-04
Applicant: QUALCOMM INC
Inventor： WALTON JAY R , KETCHUM JOHN W
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33.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：BR0209391A
公开(公告)日：2006-02-07
申请号：BR0209391
申请日：2002-05-02
Applicant: QUALCOMM INC
Inventor： WALTON JAY R
Abstract: Techniques to partition and allocate the available system resources among cells in a communication system, and to allocate the resources in each cell to terminals for data transmission on the uplink. In one aspect, adaptive reuse schemes are provided wherein the available system resources may be dynamically and/or adaptively partitioned and allocated to the cells based on a number of factors such as the observed interference levels, loading conditions, system requirements, and so on. A reuse plan is initially defined and may be redefined to reflect changes in the system. In another aspect, the system resources may be partitioned such that each cell is allocated a set of channels having different performance levels.; In yet another aspect, terminals in each cell are scheduled for data transmission (e.g., based on their priority or load requirements) and assigned channels based on their tolerance to interference and the channels' performance.
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公开(公告)号：HK1070761A1
公开(公告)日：2005-06-24
申请号：HK05103225
申请日：2005-04-15
Applicant: QUALCOMM INC
Inventor： KETCHUM JOHN W , WALTON JAY R
IPC: H04B20060101 , H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26
Abstract: Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and modulated based on a particular coding and modulation scheme to provide modulation symbols, and the modulation symbols for each selected channel are weighted based on an assigned weight. The weighting "inverts" the selected channels such that they achieve similar received SNRs. With selective channel inversion, only "good" channels in each group having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power for the group is distributed across the good channels in the group. Improved performance is achieved by using only good channels in each group and matching each selected channel's received SNR to the required SNR.
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Patent Agency Ranking
公开(公告)号：HK1065665A1
公开(公告)日：2005-02-25
申请号：HK04108306
申请日：2004-10-21
Applicant: QUALCOMM INC
Inventor： WALTON JAY R , WALLACE MARK , HOWARD STEVEN J
IPC: H04B7/04 , H04B7/06 , H04J99/00 , H04L20100101 , H04L1/00 , H04L1/06 , H04W16/00 , H04W16/28 , H04W84/14
Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.
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公开(公告)号：BR0210656A
公开(公告)日：2004-10-05
申请号：BR0210656
申请日：2002-06-25
Applicant: QUALCOMM INC
Inventor： WALTON JAY R , KETCHUM JOHN W
IPC: H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26 , H04W52/24 , H04W52/26 , H04W52/34 , H04W52/42 , H04W52/50 , H04Q7/38
Abstract: Techniques to select transmission channels for use for data transmission and to process and transmit data over the selected transmission channels. Transmission channels available for use are segregated into one or more groups, with each group including any number of channels. With selective channel transmission, only "good" channels in each group are selected (e.g., based on the channels' received SNRs and an SNR threshold), "bad" channels are not used, and the total available transmit power for the group is (e.g., uniformly) distributed across only the good channels. Each group may also be associated with a respective coding and modulation scheme, and data for each group may be coded and modulated based on the scheme selected for the group. Improved performance is achieved by using only good channels in each group and matching the data processing for the selected channels to the capacity achievable by the channels.
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公开(公告)号：BR0209636A
公开(公告)日：2004-08-31
申请号：BR0209636
申请日：2002-05-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY R , WALLACE MARK , HOWARD STEVEN J
Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.
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39.发明专利
公开(公告)号：AU2003243679A1
公开(公告)日：2004-01-06
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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40.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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