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31.发明专利
公开(公告)号：CA2736610A1
公开(公告)日：2002-11-21
申请号：CA2736610
申请日：2002-05-14
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , WALLACE MARK S , HOWARD STEVEN J
IPC: H04B1/14 , H04W72/12 , H04B7/06 , H04B7/08 , H04J99/00 , H04L12/56 , H04W16/00 , H04W24/00 , H04W72/04
Abstract: Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypothcses is selected.
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公开(公告)号：NO334254B1
公开(公告)日：2014-01-20
申请号：NO20024634
申请日：2002-09-27
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , WALTON JAY ROD , JALALI AHMAD
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公开(公告)号：AU2002360839C1
公开(公告)日：2009-01-22
申请号：AU2002360839
申请日：2002-12-31
Applicant: QUALCOMM INC
Inventor： WALLACE MARK , MEDVEDEV IRINA , WALTON JAY ROD , KETCHUM JOHN W
Abstract: Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency "signatures" of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more subhypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlinks) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics).; One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.
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公开(公告)号：DE60316663D1
公开(公告)日：2007-11-15
申请号：DE60316663
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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公开(公告)号：HK1078187A1
公开(公告)日：2006-03-03
申请号：HK05110089
申请日：2005-11-11
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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Patent Agency Ranking
公开(公告)号：NO20050351A
公开(公告)日：2005-03-18
申请号：NO20050351
申请日：2005-01-21
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , KETCHUM JOHN W
CPC classification number: H04B7/0417 , H04B7/0439 , H04B7/0443 , H04B7/0626 , H04L1/0618 , H04L25/0202 , H04L25/03343 , H04L25/03834
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公开(公告)号：BR0209640A
公开(公告)日：2004-08-31
申请号：BR0209640
申请日：2002-05-17
Applicant: QUALCOMM INC
Inventor： KETCHUM JOHN W , HOWARD STEVEN J , WALTON JAY ROD , WALLACE MARK S , LING FUNYUN
IPC: H04J99/00 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/26 , H04J11/00 , H04L1/00 , H04L1/06 , H04L5/06 , H04L25/03 , H04L27/26 , H04B7/00
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.
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公开(公告)号：AU2003265601A1
公开(公告)日：2004-03-19
申请号：AU2003265601
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：NO20035071D0
公开(公告)日：2003-11-14
申请号：NO20035071
申请日：2003-11-14
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , WALLACE MARK S , HOWARD STEVEN J
IPC: H04B7/06 , H04B1/14 , H04B7/08 , H04J99/00 , H04L12/56 , H04W16/00 , H04W72/04 , H04W72/12 , H04B
Abstract: Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypothcses is selected.
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公开(公告)号：AU2002360839A1
公开(公告)日：2003-07-24
申请号：AU2002360839
申请日：2002-12-31
Applicant: QUALCOMM INC
Inventor： KETCHUM JOHN W , WALLACE MARK , MEDVEDEV IRINA , WALTON JAY ROD
Abstract: Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency "signatures" of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more subhypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlinks) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics).; One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.
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