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180 条记录 (耗时 0.037 秒)

    Precoder design for physical layer multicasting
    41.
    发明授权
    Precoder design for physical layer multicasting 有权
    物理层组播的预编码器设计

    公开(公告)号：US08917648B2

    公开(公告)日：2014-12-23

    申请号：US13621293

    申请日：2012-09-17

    申请人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

    发明人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

    IPC分类号： H04W4/06

    CPC分类号： H04W4/06

    摘要： A method for a transmit precoder for multicast communication over a downlink in a wireless network, including: initializing a transmit precoder, a channel estimate for each user in the wireless network; updating for each user a receive filter and a slack matrix; updating the transmit precoder by solving a second order cone routine solvable in closed form; determining if a predetermined convergence is met; and outputting the updated transmit precoder responsive to the convergence criteria.

    摘要翻译： 一种用于无线网络中的下行链路上的组播通信的发送预编码器的方法，包括：初始化发送预编码器，针对无线网络中的每个用户的信道估计; 为每个用户更新接收过滤器和松弛矩阵; 通过解决封闭形式可解的二阶锥体程序来更新传输预编码器; 确定是否满足预定的会聚; 以及响应于所述收敛标准输出所述更新的发送预编码器。

    Efficient square-root free 2 symbol max-log receiver
    42.
    发明授权
    Efficient square-root free 2 symbol max-log receiver 有权
    高效的平方根自由2符号最大对数接收器

    公开(公告)号：US08767888B2

    公开(公告)日：2014-07-01

    申请号：US13433873

    申请日：2012-03-29

    申请人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    发明人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

    IPC分类号： H04L27/06 ,  H04L25/02 ,  H04L25/06 ,  H04L25/03

    CPC分类号： H04L25/0246 ,  H04L25/03171 ,  H04L25/067

    摘要： The present invention employs a look up table based implementation for the metric computations which eliminate redundancy and substantially reduce the number of multiplications. Moreover, inventive method exploits the fact that the un-normalized constellation symbols are complex integers so that the product of a real-number and an un-normalized constellation symbol can be implemented by only additions. The inventive method also enables a greater efficiency for whitening colored noise prior to demodulation, one of which involves no square-root operation. The invention results in less complexity, faster operation, lower power consumption, without sacrificing performance.

    摘要翻译： 本发明使用用于度量计算的查找表实现，其消除冗余并且显着减少乘法次数。 此外，本发明的方法利用了未归一化的星座符号是复数整数的事实，使得实数和未归一化的星座符号的乘积可以仅通过添加来实现。 本发明的方法还使得能够在解调之前增加有色噪声的效率，其中之一不涉及平方根操作。 本发明导致更少的复杂性，更快的操作，更低的功耗，而不会牺牲性能。

    MU-MIMO-OFDMA systems and methods for multi-rank CQI computation and precoder selection
    44.
    发明授权
    MU-MIMO-OFDMA systems and methods for multi-rank CQI computation and precoder selection 有权
    MU-MIMO-OFDMA系统和用于多级CQI计算和预编码器选择的方法

    公开(公告)号：US08654663B2

    公开(公告)日：2014-02-18

    申请号：US13080374

    申请日：2011-04-05

    申请人： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

    发明人： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

    IPC分类号： H04L12/28 ,  H04W4/00 ,  H04L12/56

    CPC分类号： H04W24/08 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0486 ,  H04W52/346 ,  H04W72/0406 ,  H04W72/085

    摘要： Methods and systems for determining attributes of communication channels of MU-MIMO users in an OFDMA system are disclosed. One method comprises receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band. In addition, the method further comprises determining one or more signal quality measures for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band. Moreover, an indication of the one or more signal quality measures is transmitted to the base station.

    摘要翻译： 公开了一种用于确定OFDMA系统中MU-MIMO用户的通信信道属性的方法和系统。 一种方法包括从基站接收对于连续子载波的至少一个子带，在基站上共同调度的流的总数的估计或上限的指示 至少一个子带。 另外，该方法还包括基于至少一个子带上基站的调度的流的总数的估计或上限确定至少一个子带的一个或多个信号质量度量 一个子带。 此外，向基站发送一个或多个信号质量测量的指示。

    Feed-forward control signaling and decoding schemes
    45.
    发明授权
    Feed-forward control signaling and decoding schemes 有权
    前馈控制信令和解码方案

    公开(公告)号：US08625695B2

    公开(公告)日：2014-01-07

    申请号：US13115162

    申请日：2011-05-25

    申请人： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

    发明人： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

    IPC分类号： H04B7/02 ,  H04L1/02

    CPC分类号： H04B7/0452 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/0665 ,  H04L5/0023 ,  H04L5/0094

    摘要： Systems and methods for conveying wireless transmission allocation information are disclosed. In accordance with one method, an index indicating selected data stream parameters is received. In addition, an indication of a number of transmit antennas at a transmitter from which the data stream is transmitted is also received. Further, the selected parameters are determined from the index based on the number of transmit antennas at the transmitter. Moreover, data signals are received and processed with a processor in accordance with the selected data stream parameters.

    摘要翻译： 公开了传送无线传输分配信息的系统和方法。 根据一种方法，接收指示所选数据流参数的索引。 此外，还接收在发送数据流的发送器处的多个发送天线的指示。 此外，基于发射机处的发射天线的数量，从索引确定所选择的参数。 此外，根据所选择的数据流参数，处理器接收并处理数据信号。

    User Pairing and Resource Allocation for Downlink Multiuser Multi-Input-Multi-Output In Long Term Evolution Advanced Systems
    46.
    发明申请
    User Pairing and Resource Allocation for Downlink Multiuser Multi-Input-Multi-Output In Long Term Evolution Advanced Systems 有权
    用户配对和资源分配下行多用户多输入多输出长期演进高级系统

    公开(公告)号：US20130250868A1

    公开(公告)日：2013-09-26

    申请号：US13622012

    申请日：2012-09-18

    申请人： Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan

    发明人： Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan

    IPC分类号： H04W72/06

    CPC分类号： H04W72/06 ,  H04L5/0037 ,  H04L27/2601

    摘要： A method for user pairing and resource allocation, includes performing a multiuser multi-input-multi-output (MU-MIMO) user pairing process to maximize an objective metric without common rank restriction; performing a rank balancing process to determine a uniform transmission user rank along all allocated resource blocks for each user; and with the uniform transmission user rank fixed for all the users, determining optimal user pairing and allocation for each of the resource blocks for each user.

    摘要翻译： 一种用于用户配对和资源分配的方法，包括执行多用户多输入多输出（MU-MIMO）用户配对过程以最大化不具有共同秩限制的客观量度; 执行秩平衡处理以确定针对每个用户的所有分配的资源块的均匀传输用户等级; 并且针对所有用户固定均匀传输用户等级，为每个用户确定每个资源块的最佳用户配对和分配。

    Signaling of mixture combination sets
    47.
    发明授权
    Signaling of mixture combination sets 有权
    混合组合组合信号

    公开(公告)号：US08472554B2

    公开(公告)日：2013-06-25

    申请号：US13088928

    申请日：2011-04-18

    申请人： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

    发明人： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

    IPC分类号： H04L27/00

    CPC分类号： H04B7/0452 ,  H04J11/0046 ,  H04L5/0023 ,  H04L25/03331 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/34 ,  H04W72/042 ,  H04W72/12

    摘要： Systems and methods for conveying and determining modulations schemes employed by co-scheduled users are disclosed. In addition, methods and systems for designing signaling schemes that convey such information are also disclosed. In accordance with one method, an index is received and a table of indices in which the received index denotes a plurality of different sets of modulation schemes is referenced. Further, one or more modulation schemes of at least one co-scheduled user is determined based on the referencing. In addition, data signals are received and are processed by utilizing the one or more modulation schemes.

    摘要翻译： 公开了用于传送和确定共同调度用户采用的调制方案的系统和方法。 此外，还公开了用于设计传达这种信息的信令方案的方法和系统。 根据一种方法，接收索引，并且参考其中接收到的索引表示多个不同的调制方案组的索引表。 此外，基于参考来确定至少一个共同调度用户的一个或多个调制方案。 此外，接收数据信号并通过利用一个或多个调制方案来处理数据信号。

    Max-log stack decoder
    48.
    发明授权
    Max-log stack decoder 有权
    Max-log堆栈解码器

    公开(公告)号：US08432989B2

    公开(公告)日：2013-04-30

    申请号：US12549574

    申请日：2009-08-28

    申请人： Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

    发明人： Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

    IPC分类号： H04B7/02 ,  H04L1/02

    CPC分类号： H04L25/03318 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/03203 ,  H04L2025/0342 ,  H04L2025/03426

    摘要： A method for demodulating signals in a multi-input multi-output (MIMO) receiver includes obtaining a transformed vector by a coordinate transformation of a received observation vector using a unitary matrix determined through QR decomposition of an estimated channel matrix; maintaining a list containing nodes along with a cost metric for each node; using the list to generate soft-outputs in the form of log-likelihood ratios (LLRs) for selected symbols of interest, based on the transformed vector and a lower triangular matrix determined through QR decomposition of the estimated channel matrix and the constellations to which the input symbols belong.

    摘要翻译： 一种用于在多输入多输出（MIMO）接收机中解调信号的方法，包括：使用通过估计的信道矩阵的QR分解确定的酉矩阵，通过接收到的观测向量的坐标变换来获得变换矢量; 维护包含节点的列表以及每个节点的成本度量; 使用该列表基于经变换的矢量以及通过估计的信道矩阵的QR分解确定的下一个三角矩阵和所选择的星座的星座，以所选择的感兴趣的符号的对数似然比（LLR）的形式产生软输出 输入符号属于。