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71. 发明授权

US08428530B1 Increasing the robustness of channel estimates derived through sounding for WLAN 有权
公开(公告)号：US08428530B1
公开(公告)日：2013-04-23
申请号：US13346521
申请日：2012-01-09
申请人： Rohit U. Nabar , Hongyuan Zhang , Arul Durai Murugan Palanivelu
发明人： Rohit U. Nabar , Hongyuan Zhang , Arul Durai Murugan Palanivelu
IPC分类号： H04B1/26
CPC分类号： H04L25/0228 , H04B7/0413 , H04L5/0023 , H04L25/0204 , H04W72/085
摘要： A plurality of training signal sets are transmitted. Each training signal set includes information sufficient to determine a channel estimate corresponding to a communication channel from a first station to a second station. A refined channel estimate is determined based on reception of the plurality of training signal sets.

72. 发明授权

US08379745B1 Forward channel variation detection in a wireless communication system 有权
标题翻译：无线通信系统中的前向信道变化检测
公开(公告)号：US08379745B1
公开(公告)日：2013-02-19
申请号：US12168595
申请日：2008-07-07
申请人： Rohit U. Nabar , Hongyuan Zhang , Jungwon Lee
发明人： Rohit U. Nabar , Hongyuan Zhang , Jungwon Lee
IPC分类号： H04B7/02
CPC分类号： H04B7/0456 , H04B7/0617 , H04B7/0619 , H04L1/0003 , H04L1/0009 , H04L25/0222 , H04L25/0228
摘要： A method and apparatus for detecting variations in the forward wireless channel in a wireless communication system. A plurality of reverse channel estimates in a reverse wireless channel are monitored, and a rate of change is measured between the plurality of reverse channel estimates in the reverse wireless channel. A rate of change in the forward wireless channel is estimated from the rate of change between the plurality of reverse channel estimates in the reverse wireless channel. If the estimated rate of change in the forward wireless channel exceeds a threshold, an update of a steering matrix is initiated.
摘要翻译：一种用于检测无线通信系统中的前向无线信道中的变化的方法和装置。监视反向无线信道中的多个反向信道估计，并且在反向无线信道中的多个反向信道估计之间测量变化率。根据反向无线信道中的多个反向信道估计之间的变化率来估计前向无线信道的变化率。如果前向无线信道的估计速率变化超过阈值，则启动导引矩阵的更新。

73. 发明申请

US20120207181A1 EFFICIENT PHYSICAL LAYER PREAMBLE FORMAT 有权
标题翻译：有效的物理层前置格式
公开(公告)号：US20120207181A1
公开(公告)日：2012-08-16
申请号：US13456941
申请日：2012-04-26
申请人： Hongyuan Zhang , Rohit U. Nabar , Songping Wu , Huk-Ling Lou
发明人： Hongyuan Zhang , Rohit U. Nabar , Songping Wu , Huk-Ling Lou
IPC分类号： H04L29/02
CPC分类号： H04B1/707 , H04J13/0014 , H04J13/10 , H04L27/2613 , H04L27/262
摘要： A method for processing a preamble of a data packet, received via a communication channel, using a pair of complementary sequences, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the pair of complementary sequences is zero, and wherein the preamble includes a first field that provides synchronization information and a second field that provides channel estimation information, includes at least one of (i) correlating a received signal corresponding to the preamble with at least one sequence of the pair of complementary sequences to generate a plurality of respective correlation signals, or (ii) autocorrelating the received signal to generate an autocorrelation signal. The method also includes determining a cover code in the preamble using at least one of (i) the plurality of respective correlation signals, or (ii) the autocorrelation signal. The method also includes using the cover code to decode the preamble.
摘要翻译：一种用于处理经由通信信道，使用一对互补序列接收的数据分组的前导码的方法，其中所述一对互补序列的异相非周期自相关系数的和为零，并且其中所述前同步码包括提供同步信息的第一场和提供信道估计信息的第二场包括以下中的至少一个：（i）将与所述前同步码相对应的接收信号与所述一对互补序列中的至少一个序列相关联以产生多个相应的相关信号，或（ii）自动相关接收的信号以产生自相关信号。该方法还包括使用（i）多个相关相关信号或（ii）自相关信号中的至少一个来确定前导码中的覆盖码。该方法还包括使用覆盖码来解码前导码。

74. 发明申请

US20120202439A1 POWER AMPLIFIER ADJUSTMENT FOR TRANSMIT BEAMFORMING IN MULTI-ANTENNA WIRELESS SYSTEMS 有权
标题翻译：用于多天线无线系统中发射波束的功率放大器调整
公开(公告)号：US20120202439A1
公开(公告)日：2012-08-09
申请号：US13452475
申请日：2012-04-20
申请人： Rohit U. Nabar , Hongyuan Zhang
发明人： Rohit U. Nabar , Hongyuan Zhang
IPC分类号： H04B7/04
CPC分类号： H04B7/0617 , H01Q3/40 , H03F3/245 , H03G3/3042 , H04B7/0408 , H04W16/28
摘要： One or more beamsteering matrices are applied to one or more signals to be transmitted via multiple antennas. After the one or more beamsteering matrices are applied to the one or more signals, the plurality of signals is provided to a plurality of power amplifiers coupled to the multiple antennas. Signal energies are determined for the plurality of signals provided to the plurality of power amplifiers, and relative signal energies are determined based on the determined signal energies. Output power levels of the plurality of power amplifiers are adjusted based on the determined relative signal energies.
摘要翻译：一个或多个波束导向矩阵被施加到要经由多个天线发送的一个或多个信号。在将一个或多个波束引导矩阵应用于一个或多个信号之后，将多个信号提供给耦合到多个天线的多个功率放大器。对于提供给多个功率放大器的多个信号确定信号能量，并且基于所确定的信号能量来确定相对信号能量。基于确定的相对信号能量来调整多个功率放大器的输出功率电平。

75. 发明授权

US08213870B2 Beamforming using predefined spatial mapping matrices 有权
标题翻译：使用预定义的空间映射矩阵进行波束成形
公开(公告)号：US08213870B2
公开(公告)日：2012-07-03
申请号：US12251834
申请日：2008-10-15
申请人： Hongyuan Zhang , Rohit U. Nabar
发明人： Hongyuan Zhang , Rohit U. Nabar
IPC分类号： H04B1/00
CPC分类号： H04B7/0456 , H04B7/0417 , H04B7/0617 , H04B7/0626 , H04B7/0632 , H04L1/0001
摘要： Systems and methods for transmitting packets to a receiver. In an implementation, the method includes storing, in a memory, a plurality of predefined spatial mapping matrices for use in a transmission of one or more packets to a receiver; sequentially transmitting one or more packets to the receiver, in which each of the sequential transmissions of one or more packets comprises using a different one of the plurality of predefined spatial mapping matrices stored in the memory; and selecting one of the plurality of predefined spatial mapping matrices stored in the memory for use in a subsequent transmission of one or more packets to the receiver, in which the selection of the one of the plurality of predefined spatial mapping matrices for use in the subsequent transmission is based on a quality of reception of the one or more data packets transmitted in each of the sequential transmissions.
摘要翻译：用于将数据包发送到接收器的系统和方法。在实现中，该方法包括在存储器中存储多个预定义的空间映射矩阵，用于将一个或多个分组传输到接收机; 顺序地将一个或多个分组发送到接收机，其中一个或多个分组的顺序传输中的每一个包括使用存储在存储器中的多个预定空间映射矩阵中的不同的一个; 以及选择存储在所述存储器中的所述多个预定义的空间映射矩阵中的一个，用于将一个或多个分组的后续传输用于所述接收机，其中所述多个预定空间映射矩阵中的所述一个的选择用于随后的传输基于在每个顺序传输中发送的一个或多个数据分组的接收质量。

76. 发明授权

US08175181B1 Method and apparatus for selecting a modulation coding scheme 有权
标题翻译：用于选择调制编码方案的方法和装置
公开(公告)号：US08175181B1
公开(公告)日：2012-05-08
申请号：US12131768
申请日：2008-06-02
申请人： Rohit U. Nabar , Hongyuan Zhang , Arul Durai Murugan Palanivelu
发明人： Rohit U. Nabar , Hongyuan Zhang , Arul Durai Murugan Palanivelu
IPC分类号： H04L1/02 , H04B7/212
CPC分类号： H04L1/0003 , H04L1/0009 , H04L1/04 , H04L1/06 , H04L27/2601
摘要： An indication of modulation constrained capacity of a multiple input multiple output (MIMO) communication channel is determined. The indication of modulation constrained capacity corresponds to one modulation scheme from a plurality of modulation schemes. The indication of modulation constrained capacity corresponding to the one modulation scheme is compared to a threshold corresponding to the one modulation scheme. A modulation scheme is selected from the plurality of modulation schemes based on the comparison of the indication of modulation constrained capacity to the threshold.
摘要翻译：确定多输入多输出（MIMO）通信信道的调制限制容量的指示。调制约束容量的指示对应于来自多个调制方案的一个调制方案。将与一个调制方案相对应的调制约束容量的指示与对应于一个调制方案的阈值进行比较。基于调制约束容量的指示与阈值的比较，从多个调制方案中选择调制方案。

77. 发明申请

US20110261895A1 Calibration Correction for Implicit Beamforming In a Wireless MIMO Communication System 有权
标题翻译：无线MIMO通信系统中隐式波束成形的校准校正
公开(公告)号：US20110261895A1
公开(公告)日：2011-10-27
申请号：US13178387
申请日：2011-07-07
申请人： Hongyuan Zhang , Rohit U. Nabar , Kedar Shirali , Peter Loc
发明人： Hongyuan Zhang , Rohit U. Nabar , Kedar Shirali , Peter Loc
IPC分类号： H04W4/00
CPC分类号： H04B7/0413 , H04B7/0617 , H04B17/21 , H04L25/0204 , H04L25/0228 , H04L25/03343 , H04L2025/03414 , H04L2025/03426 , H04L2025/03802
摘要： A transmitter beamforming technique for use in a MIMO wireless communication system determines a partial description of a reverse channel without determining a full dimensional description of the reverse channel. A correction matrix is developed from the partial description of the reverse channel and a description of the forward channel. The correction matrix is used to process signals to be transmitted via the forward channel, and a steering matrix is used to perform beamforming in the forward channel.
摘要翻译：用于MIMO无线通信系统的发射机波束成形技术确定反向信道的部分描述，而不确定反向信道的全维度描述。从反向信道的部分描述和正向信道的描述开发校正矩阵。校正矩阵用于处理要经由正向信道发送的信号，并且使用导引矩阵来在前向信道中执行波束成形。

78. 发明授权

US09209881B2 Alternate feedback types for downlink multiple user MIMO configurations 有权
标题翻译：用于下行链路多用户MIMO配置的备用反馈类型
公开(公告)号：US09209881B2
公开(公告)日：2015-12-08
申请号：US13161209
申请日：2011-06-15
申请人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar , Hyukjoon Kwon
发明人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar , Hyukjoon Kwon
IPC分类号： H04W16/12 , H04B7/06 , H04B7/04 , H04L25/02 , H04W72/04 , H04W48/16
CPC分类号： H04W72/0406 , H04B7/0434 , H04B7/0452 , H04B7/0617 , H04B7/0634 , H04L25/0204 , H04L25/0228 , H04L25/0242 , H04W48/16 , H04W72/046 , H04W72/082
摘要： A method in a communication network includes obtaining descriptions of a plurality of communication channels each communication channel associated with a different one of a plurality of receivers; and generating a plurality of steering vectors, one for each of the plurality of receivers, using the descriptions of the plurality of communication channels; wherein each steering vector is used to transmit data to a corresponding one of the plurality receivers via a plurality of antennas and over a corresponding one of the communication channels simultaneously and wherein each steering vector is used to communicate data on a different one of the plurality of communication channels, and wherein each steering vector is generated to reduce interference on a corresponding communication channel caused by simultaneous transmission of data on other communication channels.
摘要翻译：通信网络中的方法包括：获得与多个接收机中的不同的一个相关联的每个通信信道的多个通信信道的描述; 以及使用所述多个通信信道的描述来生成多个所述多个接收机中的每一个的导向向量; 其中每个导向矢量用于经由多个天线以及通过相应的一个通信信道同时向多个接收机中的相应一个发送数据，并且其中每个导向向量用于在多个接收机中的不同的一个上传送数据通信信道，并且其中生成每个导向矢量以减少由在其他通信信道上的数据的同时发送而引起的相应通信信道上的干扰。

79. 发明授权

US09021341B1 LDPC coding in a communication system 有权
标题翻译：通信系统中的LDPC编码
公开(公告)号：US09021341B1
公开(公告)日：2015-04-28
申请号：US13159143
申请日：2011-06-13
申请人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar
发明人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar
IPC分类号： H03M13/00 , H04L1/00 , H03M13/09
CPC分类号： H04L1/0061 , H03M13/09 , H03M13/1102 , H03M13/23 , H03M13/618 , H03M13/6362 , H03M13/6513 , H03M13/6516 , H03M13/6527 , H04L1/0033 , H04L1/0057 , H04L1/0066 , H04L1/0075 , H04L1/0091 , H04L1/0625
摘要： In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, a plurality of information bits to be included in the PHY data unit are received, and a number of orthogonal frequency division multiplexing (OFDM) symbols that are needed to include the plurality of information bits after encoding with a low density parity check (LDPC) encoder is determined. One or more of a, b, c, and d are performed according to a set of rules so that a receiving device can determine a number of information bits in the PHY data unit based on i) an indication of the number of OFDM symbols, and ii) the set rules: a) adding padding bits and/or shortening bits prior to encoding with the LDPC encoder, b) removing shortening bits after encoding with the LDPC encoder, c) removing parity bits after encoding with the LDPC encoder, d) repeating information and/or parity bits after encoding with the LDPC encoder. The plurality of information bits are encoded using the LDPC encoder. The PHY data unit is generated i) to include the LDPC encoded information bits in OFDM symbols and ii) to include an indication of the number of OFDM symbols in the PHY data unit.
摘要翻译：在用于生成经由通信信道传输的物理层（PHY）数据单元的方法中，接收要包括在PHY数据单元中的多个信息比特，以及多个正交频分复用（OFDM）符号，需要在用低密度奇偶校验（LDPC）编码器编码之后包括多个信息比特。根据一组规则执行a，b，c和d中的一个或多个，使得接收设备可以基于i）OFDM符号的数量的指示来确定PHY数据单元中的多个信息比特，和ii）设置规则：a）在用LDPC编码器进行编码之前，添加填充比特和/或缩短比特，b）在用LDPC编码器进行编码之后，去除缩短比特，c）在用LDPC编码器编码之后去除奇偶校验位，d ）在用LDPC编码器编码之后重复信息和/或奇偶校验位。使用LDPC编码器对多个信息比特进行编码。生成PHY数据单元i）在OFDM符号中包含LDPC编码信息比特，以及ii）包括PHY数据单元中的OFDM符号数量的指示。

80. 发明授权

US08941538B1 Iterative technique for fast computation of TxBF steering weights 有权
标题翻译：用于快速计算TxBF转向重量的迭代技术
公开(公告)号：US08941538B1
公开(公告)日：2015-01-27
申请号：US13463859
申请日：2012-05-04
申请人： Rohit U. Nabar , Hongyuan Zhang , Sudhir Srinivasa
发明人： Rohit U. Nabar , Hongyuan Zhang , Sudhir Srinivasa
IPC分类号： H01Q3/00 , H04B7/06
CPC分类号： H01Q3/00 , H04B7/0617 , H04B7/0626 , H04B7/0634
摘要： Systems and methods are provided for directing radiated energy from a transmitting device towards a receiving device using multiple antennas. Channel weights, representing signal attenuation and a phase rotation induced by a transmission medium, are determined at a transmitting device. A set of steering weights are determined based on applying an iterative linear transform to an initial value of the steering weights, where the linear transform depends on the determined channel weights. A final value of the steering weights is applied to an input signal to produce a transmit signal, and the transmit signal is transmitted using multiple antennas.
摘要翻译：提供了系统和方法，用于使用多个天线将辐射能量从发射设备引导到接收设备。在发送设备处确定表示信号衰减和由传输介质引起的相位旋转的信道权重。基于将迭代线性变换应用于转向权重的初始值来确定一组转向权重，其中线性变换取决于确定的信道权重。将转向权重的最终值应用于输入信号以产生发送信号，并且使用多个天线发送发送信号。

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