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。

公开(公告)号：US20100008436A1

公开(公告)日：2010-01-14

申请号：US12489865

申请日：2009-06-23

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H04L27/28

CPC分类号： H04L27/2649 ,  H04L1/0072 ,  H04L1/0079 ,  H04L5/0007 ,  H04L5/0092 ,  H04L25/0204 ,  H04L25/022 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2601 ,  H04L27/2602

摘要： Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal.

摘要翻译： 提供了系统和方法，用于基于接收信号的一部分，以单载波模式或多载波模式处理接收信号的有效载荷部分。 以第一速率接收单载波信令部分，以及信号的有效载荷部分是单载波信号还是从所接收的单载波信令部分检测多载波信号。 如果检测结果确定接收信号的有效载荷部分是单载波信号，则以第一速率接收接收信号的有效载荷部分并以单载波模式进行解调，并且接收信号的有效载荷部分被解调为 多载波模式，如果检测确定接收信号的有效载荷部分是多载波信号。

公开(公告)号：US09924512B1

公开(公告)日：2018-03-20

申请号：US12730651

申请日：2010-03-24

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Hui-Ling Lou

IPC分类号： H04W4/00 ,  H04W72/04 ,  H04L5/00 ,  H04W84/12

CPC分类号： H04W72/0453 ,  H04L5/0007 ,  H04L5/003 ,  H04W84/12

摘要： A plurality of different orthogonal frequency division multiplexing (OFDM) sub-channel blocks are assigned to a plurality of devices including a first device and a second device. The plurality of OFDM sub-channel blocks includes a first OFDM sub-channel block assigned to the first device and a second OFDM sub-channel block assigned to the second device. Data for the first device and data for the second device are received. OFDM data units are generated, wherein data for the first device is modulated on sub-channels in the first OFDM sub-channel block and data for the second device is modulated on sub-channels in the second OFDM sub-channel block. At least one of the OFDM sub-channel blocks is formatted to substantially conform to a physical layer specification of a WLAN communication protocol having a maximum channel bandwidth smaller than a bandwidth of the generated OFDM data units.

公开(公告)号：US08897394B1

公开(公告)日：2014-11-25

申请号：US12400442

申请日：2009-03-09

申请人： Rohit U. Nabar ,  Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Rohit U. Nabar ,  Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H03K9/00

CPC分类号： H04W72/085 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0028 ,  H04L5/0069 ,  H04L5/0085 ,  H04L25/0204 ,  H04L25/0228 ,  H04L27/0008 ,  H04L27/261 ,  H04W24/10 ,  H04W88/06

摘要： Methods and apparatus are provided for adaptively selecting a communications mode in high frequency systems. A first dual-mode device having capabilities of using two or more high frequency communications modes, such as OFDM and SC modulation, may transmit a signal to a second dual-mode device with the same capabilities. The second dual-mode device may compute a channel characteristic associated with a high frequency communications channel and select an optimal high frequency communications mode. The second dual-mode device may transmit information indicative of the channel characteristic or the selected communications mode to the first dual-mode device. The first dual-mode device may select and operate using the optimal high frequency communications mode based on the information received from the second dual-mode device. The first and second dual-mode devices may communicate using the selected high frequency communications mode.

摘要翻译： 提供了用于在高频系统中自适应地选择通信模式的方法和装置。 具有使用诸如OFDM和SC调制之类的两个或多个高频通信模式的能力的第一双模设备可以将信号发送到具有相同能力的第二双模设备。 第二双模设备可以计算与高频通信信道相关联的信道特性，并选择最佳高频通信模式。 第二双模设备可以向第一双模设备发送指示信道特性或所选通信模式的信息。 第一双模设备可以基于从第二双模设备接收的信息，使用最佳高频通信模式来选择和操作。 第一和第二双模式设备可以使用所选择的高频通信模式进行通信。

公开(公告)号：US08634489B1

公开(公告)日：2014-01-21

申请号：US13465571

申请日：2012-05-07

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 ,  H04J3/16

CPC分类号： H04L1/0003 ,  H04L1/0009 ,  H04L1/04 ,  H04L1/06 ,  H04L27/2601

摘要： A computer-readable memory tangibly stores a plurality of instructions that, when executed by one or more processors, cause the one or more processors to determine an indication of modulation constrained capacity of a multiple input multiple output (MIMO) communication channel. The indication of modulation constrained capacity corresponds to one modulation scheme from a plurality of modulation schemes. The instructions also cause the one or more processors to compare the indication of modulation constrained capacity corresponding to the one modulation scheme to a threshold corresponding to the one modulation scheme, and to select a modulation scheme from the plurality of modulation schemes based on the comparison of the indication of modulation constrained capacity to the threshold.

摘要翻译： 计算机可读存储器有形地存储多个指令，当由一个或多个处理器执行时，使得一个或多个处理器确定多输入多输出（MIMO）通信信道的调制约束容量的指示。 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。 所述指令还使所述一个或多个处理器将对应于所述一个调制方案的调制约束容量的指示与对应于所述一个调制方案的阈值进行比较，并且基于所述多个调制方案的比较来选择来自所述多个调制方案的调制方案 调制约束能力的指示达到阈值。

公开(公告)号：US08625701B2

公开(公告)日：2014-01-07

申请号：US13540257

申请日：2012-07-02

申请人： Hongyuan Zhang ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Rohit U. Nabar

IPC分类号： H04L1/02

CPC分类号： H04B7/0417 ,  H04B7/0626 ,  H04B7/0639 ,  H04B7/0691 ,  H04B7/0874 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/06

摘要： Channel sounding information is received by a first communication device during an antenna selection training procedure. Antenna selection computations are performed, and the computations (i) assume that a second communication device uses a first Nss columns of a full-dimensional spatial spreading matrix to transmit the channel sounding information during the antenna selection training procedure, and (ii) accounts for the use, by the second communication device, of the first Nss columns of the full-dimensional spatial spreading matrix when transmitting Nss spatial streams. The full dimensional channel spatial spreading matrix has components i) a number of rows equal to a number, NT, of transmission chains to be used by the second communication device to transmit spatial data streams, and ii) a column dimension having a number of columns equal to NT, and Nss is less than both NT and NR, the number of receiving chains of the first communication device.

摘要翻译： 在天线选择训练过程期间，第一通信设备接收信道探测信息。 执行天线选择计算，并且计算（i）假设第二通信设备使用全维空间扩展矩阵的第一Nss列在天线选择训练过程期间发送信道探测信息，并且（ii）考虑 当发送Nss个空间流时，由第二通信设备使用全维空间扩展矩阵的第一Nss个列。 全维度信道空间扩展矩阵具有分量i）等于由第二通信设备用于传输空间数据流的传输链的数量NT，以及ii）具有多个列的列维数 等于NT，Nss小于NT和NR，第一通信设备的接收链的数量。

公开(公告)号：US20130235908A1

公开(公告)日：2013-09-12

申请号：US13771596

申请日：2013-02-20

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H04B1/707

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers.

摘要翻译： 用于互补Golay序列发生器或互补Golay序列相关器的电路包括被配置为接收输入信号的输入，一组延迟元件，包括对应于1,2,4,8,16的各个延迟的延迟元件 ，32和64，以及与输入和该组延迟元件互连的一组乘法器。 乘数组被配置为应用权重因子，权重因子定义了序列1,1,1,1,1,1,1。 电路还包括一对输出，其被配置为响应于输入信号输出（i）一对互补格雷序列中的一个或（ii）一对相关输出信号，使用（a）该组延迟元件 和（b）一组权重乘数。

公开(公告)号：US08442138B2

公开(公告)日：2013-05-14

申请号：US12044117

申请日：2008-03-07

申请人： Hongyuan Zhang ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Rohit U. Nabar

IPC分类号： H04L5/12 ,  H04B3/36 ,  H03M7/40

CPC分类号： H04B7/0417 ,  H04B7/0634 ,  H04B7/0639

摘要： A method select a codebook for transmit beamforming. The method constructs an estimated channel matrix based on a codebook, selects a channel submatrix from the estimated channel matrix, calculates a selection matrix from the channel submatrix; and assigns a steering matrix based on the selection matrix. There may be multiple codebooks and the method may construct an estimated channel matrix, select a channel submatrix, and calculate a selection matrix for each of the codebooks, then select an optimal codebook. The steering matrix is assigned based on the optimal codebook. The steering matrix may be used in steering a transmitted packet. The method may also calculate a post-MIMO equalizer signal-to-noise ratio for a data stream, based on the estimated channel matrix and the selected codebook. A related system is also disclosed. Other embodiments are provided, and each of the embodiments described herein can be used alone or in combination with one another.

摘要翻译： 一种方法选择用于发送波束成形的码本。 该方法构建了基于码本的估计信道矩阵，从估计的信道矩阵中选择一个信道子矩阵，从该信道子矩阵中计算一个选择矩阵; 并根据选择矩阵分配导引矩阵。 可以存在多个码本，并且该方法可以构建估计的信道矩阵，选择信道子矩阵，并且计算每个码本的选择矩阵，然后选择最佳码本。 基于最佳码本分配指导矩阵。 导向矩阵可以用于控制传输的分组。 该方法还可以基于估计的信道矩阵和选择的码本计算数据流的后MIMO均衡器信噪比。 还公开了相关系统。 提供了其它实施例，并且本文所述的每个实施例可以单独使用或彼此组合使用。

公开(公告)号：US08428168B1

公开(公告)日：2013-04-23

申请号：US12371367

申请日：2009-02-13

申请人： Hongyuan Zhang ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Rohit U. Nabar

IPC分类号： H04B7/02

CPC分类号： H04B7/061 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0691

摘要： A plurality of consecutive sounding data units are received via a reverse link. Each consecutive sounding data unit is received via a different subset of antennas. Channel state information (CSI) is generated based on the received plurality of consecutive sounding data units. A subset of antennas to use in a forward link is determined based on the generated CSI.

摘要翻译： 经由反向链路接收多个连续的探测数据单元。 经由不同的天线子集接收每个连续的探测数据单元。 基于所接收的多个连续的探测数据单元生成信道状态信息（CSI）。 基于生成的CSI来确定在前向链路中使用的天线的子集。

公开(公告)号：US08358668B2

公开(公告)日：2013-01-22

申请号：US12410883

申请日：2009-03-25

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H04J3/16

CPC分类号： H04L27/14 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0092 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2602

摘要： Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory.

摘要翻译： 提供了系统和方法，用于基于接收信号的一部分，使用无线信道接收机以单载波模式或多载波模式处理接收信号的有效载荷部分，其中接收信号的信令部分是单载波 信号。 接收单载波信令部分，以及信号的有效载荷部分是单载波信号还是从所接收的单载波信令部分检测多载波信号。 如果检测确定接收信号的有效载荷部分是单载波信号，则以单载波模式解调接收信号的有效载荷部分，并且如果检测到接收信号的有效载荷部分以多载波模式被解调 确定接收信号的有效载荷部分是多载波信号。 来自接收信号的解调有效载荷部分的数据被存储在计算机可读存储器中。