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    Resource allocation for MIMO-OFDM communication systems
    11.
    发明授权
    Resource allocation for MIMO-OFDM communication systems 有权

    公开(公告)号：US07020110B2

    公开(公告)日：2006-03-28

    申请号：US10042529

    申请日：2002-01-08

    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.

    Time-domain transmit and receive processing with channel EIGEN-mode decomposition for MIMO systems
    14.
    发明授权
    Time-domain transmit and receive processing with channel EIGEN-mode decomposition for MIMO systems 有权
    用于MIMO系统的信道EIGEN模式分解的时域发射和接收处理

    公开(公告)号：US08199842B2

    公开(公告)日：2012-06-12

    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。

    Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
    15.
    发明授权
    Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion 有权
    用于在使用选择性信道反演的多信道通信系统中处理用于传输的数据的方法和装置

    公开(公告)号：US07688899B2

    公开(公告)日：2010-03-30

    申请号：US09860274

    申请日：2001-05-17

    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: H04K1/10

    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最佳信道并且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相匹配的综合益处，实现了改进的性能。

    Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems
    17.
    发明授权
    Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems 有权

    公开(公告)号：US07020482B2

    公开(公告)日：2006-03-28

    申请号：US10056275

    申请日：2002-01-23

    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.

    Pilot transmission schemes for wireless multi-carrier communication systems
    18.
    发明授权
    Pilot transmission schemes for wireless multi-carrier communication systems 有权
    无线多载波通信系统的导频传输方案

    公开(公告)号：US07280467B2

    公开(公告)日：2007-10-09

    申请号：US10359811

    申请日：2003-02-07

    Applicant: John Smee ,  Jay Rod Walton ,  Durga Prasad Malladi

    Inventor： John Smee ,  Jay Rod Walton ,  Durga Prasad Malladi

    IPC: H04J11/00 ,  H04B7/216 ,  H04B1/06

    CPC classification number: H04L5/0039 ,  H04B7/0669 ,  H04B7/0854 ,  H04L1/0017 ,  H04L1/0071 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0226 ,  H04L25/03343 ,  H04L25/03866 ,  H04L27/2602 ,  H04L27/261

    Abstract: Pilot transmission schemes suitable for use in wireless multi-carrier (e.g., OFDM) communication systems. These pilot transmission schemes may utilize frequency, time, or both frequency and time orthogonality to achieve orthogonality among the pilots transmitted by multiple base stations on the downlink. Frequency orthogonality is achieved by transmitting pilots on disjoint sets of subbands. Time orthogonality is achieved by transmitting pilots using different orthogonal codes (e.g., Walsh codes). The pilots may also be scrambled with different scrambling codes, which are used to randomize pilot interference and to enable identification of the transmitters of these pilots. Pilot interference cancellation may be performed to improve performance since subbands used for data transmission by one transmitter may also be used for pilot transmission by another transmitter. Pilot interference is estimated and then subtracted from received symbols to obtain pilot-canceled symbols having improved quality.

    Abstract translation: 适用于无线多载波（例如，OFDM）通信系统的导频传输方案。 这些导频传输方案可以利用频率，时间或频率和时间两个正交性来实现在下行链路上由多个基站发送的导频之间的正交性。 通过在不相交的子带集合上发送导频来实现频率正交性。 通过使用不同的正交码（例如沃尔什码）发射导频来实现时间正交性。 导频还可以用不同的扰码进行加扰，这些扰码用于随机化导频干扰并且能够识别这些飞行员​​的发射机。 可以执行导频干扰消除以改善性能，因为用于一个发射机的数据传输的子带也可以用于另一发射机的导频传输。 导频干扰被估计，然后从接收到的符号中减去以获得具有改进质量的导频消除符号。

    Beam-steering and beam-forming for wideband MIMO/MISO systems
    19.
    发明授权
    Beam-steering and beam-forming for wideband MIMO/MISO systems 有权
    用于宽带MIMO / MISO系统的波束转向和波束形成

    公开(公告)号：US07194040B2

    公开(公告)日：2007-03-20

    申请号：US11184601

    申请日：2005-07-18

    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: H04K1/10 ,  H04L27/28

    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。

    Method and apparatus for allocating uplink resources in a multiple-input multiple-output (MIMO) communication system
    20.
    发明授权
    Method and apparatus for allocating uplink resources in a multiple-input multiple-output (MIMO) communication system 有权
    用于在多输入多输出（MIMO）通信系统中分配上行链路资源的方法和装置

    公开(公告)号：US07184743B2

    公开(公告)日：2007-02-27

    申请号：US11301790

    申请日：2005-12-12

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

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

    IPC: H04B1/16

    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.

    Abstract translation: 在无线通信系统中为多个终端安排上行链路数据传输的技术。 在一种方法中，为了可能的数据传输而形成多个终端组，每组包括终端的唯一组合，并对应于待评估的假设。 评估每个假设的性能（例如，基于每个终端的信道响应估计），并且基于性能选择一个评估假设。 所选假设中的终端被调度用于数据传输。 可以使用连续的取消接收器处理方案来处理由调度的终端发送的信号。 在这种情况下，可以形成每组中的终端的一个或多个排序，其中每个终端排序对应于待评估的子假设。 然后评估每个子假设的性能，并选择一个子假设。

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