公开(公告)号：US08194770B2

公开(公告)日：2012-06-05

申请号：US10229209

申请日：2002-08-27

Applicant: Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

Inventor： Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04W52/346 ,  H04B7/0413 ,  H04B7/0439 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0041 ,  H04L1/0068 ,  H04L1/0071 ,  H04W52/42

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).

Abstract translation: 提出了在MIMO系统中对每个本征模执行选择性信道反演以实现高频谱效率同时降低发射机和接收机两者的复杂度的技术。 可用的传输信道被布置成多个组，其中每个组可以包括用于MIMO信道的相应本征模式的所有传输信道（或频率仓）。 使用特定组功率分配方案将总发射功率分配给组。 然后为选择用于数据传输的每个组独立地执行选择性信道反转。 对于每个这样的组，组中的一个或多个传输信道被选择用于使用，并且为每个所选择的信道确定缩放因子，使得该组的所有选择的信道实现相似的接收信号质量（例如，接收到的SNR）。

公开(公告)号：US08094625B2

公开(公告)日：2012-01-10

申请号：US11248890

申请日：2005-10-11

Applicant: Jay Rod Walton ,  John W. Ketchum ,  Mark Wallace ,  Irina Medvedev

Inventor： Jay Rod Walton ,  John W. Ketchum ,  Mark Wallace ,  Irina Medvedev

IPC: H04Q7/00

CPC classification number: H04L5/0023 ,  H04L1/06 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0058 ,  H04L5/006

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 sub-hypotheses 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 downlink) 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.

Abstract translation: 基于终端的空间和/或频率“签名”，在MIMO-OFDM系统的下行链路和/或上行链路上安排终端进行数据传输的技术。 调度器形成用于多个频带中的每一个的可能（下行链路或上行链路）数据传输的一个或多个终端集合。 每个假设可以进一步形成一个或多个子假设，每个子假设对应于（1）假设（对于下行链路）的发射天线到终端的特定分配，或者（2）特定顺序 用于处理来自终端（用于上行链路）的上行链路数据传输。 然后评估每个子假设的性能（例如，基于一个或多个性能度量）。 然后根据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一个或多个终端用于相应频带上的数据传输。

公开(公告)号：US08078211B2

公开(公告)日：2011-12-13

申请号：US11330733

申请日：2006-01-11

Applicant: Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

Inventor： Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

IPC: H04B7/00

CPC classification number: H04W52/346 ,  H04B7/0443 ,  H04W24/00 ,  H04W52/241 ,  H04W52/267 ,  H04W52/50 ,  H04W72/00

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.

Abstract translation: 在多信道通信系统中将总传输功率分配给传输信道的技术，使得可以实现更高的总体系统频谱效率和/或其他益处。 可以基于特定的功率分配方案（例如，灌水方案）将总发射功率最初分配给传输信道。 初始分配可以导致比实现所需SNR（例如，实现最大允许数据速率所需的SNR）所需的更多功率被分配给一些传输信道，这将导致这些传输信道在饱和区域中操作 。 在这种情况下，这些技术将在饱和区域中运行的传输信道的多余发射功率重新分配到在饱和区域以下运行的其它传输信道。 以这种方式，对于“较差”的传输信道可以实现更高的数据速率，而不牺牲“更好”的传输信道的性能。

公开(公告)号：US20100246704A1

公开(公告)日：2010-09-30

申请号：US12713121

申请日：2010-02-25

Applicant: John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

Inventor： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

IPC: H04B7/02 ,  H04L27/28

CPC classification number: H04W52/346 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/06 ,  H04L25/03343 ,  H04L2001/0096 ,  H04W52/24 ,  H04W52/42

Abstract: Techniques 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. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

公开(公告)号：US20100166100A1

公开(公告)日：2010-07-01

申请号：US12721697

申请日：2010-03-11

Applicant: Irina Medvedev ,  Jay Rod Walton ,  Mark Wallace

Inventor： Irina Medvedev ,  Jay Rod Walton ,  Mark Wallace

IPC: H04B7/02 ,  H04L27/00 ,  H04L25/03

CPC classification number: H04B7/0417 ,  H04B7/043 ,  H04B7/0439 ,  H04B7/0443 ,  H04B7/061 ,  H04B7/0626 ,  H04B7/0689 ,  H04B7/0691 ,  H04B7/0854 ,  H04L1/0002 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0046 ,  H04L5/006 ,  H04W52/42

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.

Abstract translation: 使用需要较少信道状态信息（CSI）的多个传输方案在多信道通信系统中在多个传输信道上传输数据的技术。 这些方案可以包括在被选择使用的每个发射天线上发送单个数据流的部分CSI传输方案以及将所有发射功率分配给具有最佳性能的单个传输信道的“波束形成”传输方案。 每个传输方案可以为特定范围的操作条件（或操作SNR）提供良好或接近最佳的性能。 然后，这些多个传输方案可以以分段方式组合以形成覆盖由MIMO系统支持的全部操作条件的“多模式”传输方案。 在任何给定时刻用于数据传输的具体传输方案将取决于系统在此刻经历的特定操作条件。

公开(公告)号：US07047016B2

公开(公告)日：2006-05-16

申请号：US09859346

申请日：2001-05-16

Applicant: Jay Rod Walton ,  Mark S. Wallace ,  Steven J. Howard

Inventor： Jay Rod Walton ,  Mark S. Wallace ,  Steven J. Howard

IPC: H04Q7/20

CPC classification number: H04W72/121 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0697 ,  H04B7/0891 ,  H04W72/1205

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-hypotheses is selected.

公开(公告)号：US06940917B2

公开(公告)日：2005-09-06

申请号：US10228393

申请日：2002-08-27

Applicant: Murali Paravath Menon ,  John W. Ketchum ,  Mark Wallace ,  Jay Rod Walton ,  Steven J. Howard

Inventor： Murali Paravath Menon ,  John W. Ketchum ,  Mark Wallace ,  Jay Rod Walton ,  Steven J. Howard

IPC: H04J99/00 ,  H01Q3/26 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L27/26 ,  H04B7/02

CPC classification number: H04B7/0417 ,  H01Q3/26 ,  H04B7/043 ,  H04B7/0617 ,  H04B7/0634 ,  H04L5/0025 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/0096 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802 ,  H04W52/42

Abstract: Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scaling value is then obtained for each subband based on its allocated transmit power. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steering vector. A stream of preconditioned symbols is then formed for each transmit antenna.

Abstract translation: 执行波束转向和波束成形以在宽带多输入通道中的单个本征模上传输数据的技术。 在一种方法中，为多个子带中的每一个获得导向矢量。 取决于如何定义导向矢量，可以为每个子带实现波束转向或波束形成。 基于特定功率分配方案（例如，全信道反转，选择性信道反转，充水或均匀）将总发射功率分配给子带。 然后根据其分配的发射功率，为每个子带获得缩放值。 要发送的数据被编码和调制以提供调制符号。 要在每个子带上发送的调制符号用子带的缩放值进行缩放，并进一步用子带的导向矢量进行预处理。 然后为每个发射天线形成预处理符号流。

公开(公告)号：US07885228B2

公开(公告)日：2011-02-08

申请号：US10394529

申请日：2003-03-20

Applicant: Jay Rod Walton ,  Irina Medvedev

Inventor： Jay Rod Walton ,  Irina Medvedev

IPC: H04W4/00 ,  H04B17/00 ,  H04B7/185 ,  H04M1/00 ,  H04K1/10

CPC classification number: H04L1/0016 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0021 ,  H04L1/0025 ,  H04L1/0618 ,  H04L27/2602

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.

Abstract translation: 在具有变化的SNR的多个传输信道的多信道通信系统中为数据传输选择合适的传输模式的技术。 在一种方法中，对于用于发送数据流的多个传输信道中的每一个，最初获得SNR估计。 然后针对多个传输信道的SNR估计计算平均SNR和无偏差方差。 例如，基于SNR方差和缩放因子来确定回退因子。 接下来基于平均SNR和退避因子来计算传输信道的操作SNR。 然后基于操作SNR为数据流选择传输模式。 选择的传输模式与小于或等于操作SNR的最高要求SNR相关联。 该方法可以用于具有变化的SNR的具有多个传输信道的任何系统。

公开(公告)号：US20100104039A1

公开(公告)日：2010-04-29

申请号：US12559318

申请日：2009-09-14

Applicant: John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

Inventor： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

IPC: H04B7/02 ,  H04B15/00

CPC classification number: H04W52/346 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/06 ,  H04L25/03343 ,  H04L2001/0096 ,  H04W52/24 ,  H04W52/42

Abstract: Techniques 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. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

Abstract translation: 用于处理数据以在从所有可用传输信道中选择的一组传输信道上进行传输的技术。 在一方面，数据处理包括基于公共编码和调制方案的编码数据，以提供调制符号并且基于该信道的特征对每个所选择的信道预先加权调制符号。 预加权可以通过“反转”所选择的信道来实现，使得接收的SNR对于所有选择的信道大致相似。 通过选择性信道反转，仅选择具有等于或高于特定阈值的SNR的信道，不使用“坏”信道，并且总可用发射功率仅在“良好”信道上分布。 由于仅使用NS最佳通道并将每个所选信道的接收SNR与所选择的编码和调制方案所需的SNR相匹配的优点，可以实现改进的性能。

公开(公告)号：US20080317158A1

公开(公告)日：2008-12-25

申请号：US12193628

申请日：2008-08-18

Applicant: John W. Ketchum ,  Mark Wallace ,  Steven J. Howard ,  Jay Rod Walton

Inventor： John W. Ketchum ,  Mark Wallace ,  Steven J. Howard ,  Jay Rod Walton

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04B7/0417 ,  H04B7/0443 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0029 ,  H04L25/03343 ,  H04L25/03834 ,  H04L27/2601 ,  H04L27/2647 ,  H04L2025/0349 ,  H04L2025/03605

Abstract: Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to “precondition” modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.

Abstract translation: 用于在发射机和接收机处理数据传输的技术。 在一方面，提供了时域实现，其使用频域奇异值分解和“注水”结果以在发射机和接收机处导出时域脉冲整形和波束导向解决方案。 在发射机处执行奇异值分解以确定MIMO信道的本征模式（即，空间子信道），并导出用于“调制前缀”调制符号的第一组导引向量。 奇异值分解也在接收机处执行，以导出用于预处理接收信号的第二组导引向量，使得在接收机处恢复正交符号流，这可以简化接收机处理。 使用浇注分析来更好地将总可用发射功率分配给本征模式，该本征模式确定了要用于每个本征模式的数据速率和编码和调制方案。