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111. 发明授权

US08380148B2 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成形的功率放大器调整
公开(公告)号：US08380148B2
公开(公告)日：2013-02-19
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： H01Q11/12 , H04B1/04
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。

112. 发明授权

US08179315B1 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：US08179315B1
公开(公告)日：2012-05-15
申请号：US12903523
申请日：2010-10-13
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
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。

113. 发明授权

US08095097B1 Increasing the robustness of channel estimates derived through sounding for WLAN 有权
标题翻译：增加通过WLAN的声音导出的信道估计的鲁棒性
公开(公告)号：US08095097B1
公开(公告)日：2012-01-10
申请号：US12186437
申请日：2008-08-05
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： H04B1/18
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.
摘要翻译：发送多个训练信号组。每个训练信号组包括足以确定对应于从第一站到第二站的通信信道的信道估计的信息。基于多个训练信号组的接收来确定精细信道估计。

114. 发明授权

US07978784B2 Antenna selection and training using a spatial spreading matrix for use in a wireless MIMO communication system 有权
标题翻译：使用空间扩展矩阵在无线MIMO通信系统中使用的天线选择和训练
公开(公告)号：US07978784B2
公开(公告)日：2011-07-12
申请号：US12105750
申请日：2008-04-18
申请人： Hongyuan Zhang , Rohit U. Nabar
发明人： Hongyuan Zhang , Rohit U. Nabar
IPC分类号： H04L27/00
CPC分类号： H04B7/0417 , H04B7/0626 , H04B7/0639 , H04B7/0691 , H04B7/0874 , H04L1/0054 , H04L1/0071 , H04L1/06
摘要： A wireless communication system and method uses a spatial spreading matrix to distribute the encoded spatial data streams to a number of transmit chains and further uses the spatial spreading matrix for antenna selection computation in a transmitter. The spatial spreading matrix is designed such that a receiver is able to know and utilize the spatial spreading matrix for computing transmission antenna selection, receiver antenna selection and joint transmission/receiving antenna selection. The use of this spatial spreading matrix for antenna selection computation provides increased accuracy in antenna selection for transmission of spatial data streams, where the number of spatial data streams is less than the number of transmit or receive chains between the transmitter and receiver, and the number of transmit or receive chains is less than the corresponding transmission or receiving antennas.
摘要翻译：无线通信系统和方法使用空间扩展矩阵将编码的空间数据流分配到多个发射链，并且还在发射机中使用空间扩展矩阵进行天线选择计算。设计空间扩展矩阵，使得接收机能够知道和利用空间扩展矩阵来计算发射天线选择，接收机天线选择和联合发射/接收天线选择。用于天线选择计算的这种空间扩展矩阵的使用在空间数据流的传输的天线选择中提供了更高的精度，其中空间数据流的数量小于发射机和接收机之间的发射或接收链的数量，的发射或接收链小于相应的发射或接收天线。

115. 发明申请

US20080219373A1 CODEBOOK SELECTION FOR TRANSMIT BEAMFORMING 有权
标题翻译：传输波束编码选择
公开(公告)号：US20080219373A1
公开(公告)日：2008-09-11
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
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。

116. 发明授权

US08897393B1 Protected codebook selection at receiver for transmit beamforming 有权
标题翻译：用于发送波束成形的受保护码本选择
公开(公告)号：US08897393B1
公开(公告)日：2014-11-25
申请号：US12253078
申请日：2008-10-16
申请人： Hongyuan Zhang , Rohit U. Nabar , Atul Salhotra
发明人： Hongyuan Zhang , Rohit U. Nabar , Atul Salhotra
IPC分类号： H04L1/00 , H04L27/00
CPC分类号： H04L1/00 , H04B7/0456 , H04B7/0478 , H04B7/0663 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/0228 , H04L25/0242
摘要： In one or more embodiments, in a communications terminal an estimated channel matrix is constructed based on a codebook. A modified estimated channel matrix is calculated based on both the estimated channel matrix and a protection matrix, and a channel submatrix is selected from the modified estimated channel matrix. A selection matrix is calculated from the channel submatrix, and fed back to be used in generating a steering matrix.
摘要翻译：在一个或多个实施例中，在通信终端中，基于码本构建估计信道矩阵。基于估计的信道矩阵和保护矩阵来计算修改的估计信道矩阵，并且从修改的估计信道矩阵中选择信道子矩阵。从信道子矩阵计算选择矩阵，并将其反馈以用于产生导引矩阵。

117. 发明授权

US08498362B2 Channel sounding and estimation strategies for antenna selection in MIMO systems 有权
标题翻译： MIMO系统中天线选择的信道探测和估计策略
公开(公告)号：US08498362B2
公开(公告)日：2013-07-30
申请号：US12363269
申请日：2009-01-30
申请人： Hongyuan Zhang , Rohit U. Nabar , Peter Loc
发明人： Hongyuan Zhang , Rohit U. Nabar , Peter Loc
IPC分类号： H04B15/00
CPC分类号： H04B7/0426 , H04B7/0417 , H04B7/0443 , H04B7/0447 , H04B7/0632 , H04B7/0691 , H04B7/0817 , H04B7/0874 , H04L25/0202 , H04L25/0226 , H04L25/0228 , H04L27/2647 , H04W52/42
摘要： Techniques and devices for antenna selection in a multiple-input-multiple-output (MIMO) system, in which communication is between a transmitter having a first plurality of radio-frequency (RF) chains coupled to a first plurality of antennas and a receiver having a second plurality of RF chains coupled to a second plurality of antennas, are provided. Techniques include receiving consecutive sounding packets each have a training symbol and that collectively sound a full-size channel for the MIMO system. A sub-channel estimate for each sounding packet can then be determined based on various factors, such as a known power level rule and gain factor. Scaling factors may be applied to each of these sub-channel estimates to produce a scaled sub-channel estimates.
摘要翻译：在多输入多输出（MIMO）系统中用于天线选择的技术和设备，其中通信在具有耦合到第一多个天线的第一多个射频（RF）链的发射机之间进行通信，以及具有提供耦合到第二多个天线的第二多个RF链。技术包括接收连续的探测分组，每个分组具有训练符号，并且共同发出用于MIMO系统的全尺寸信道。然后可以基于诸如已知功率电平规则和增益因子的各种因素来确定每个探测分组的子信道估计。可以对这些子信道估计中的每一个应用缩放因子以产生缩放的子信道估计。

118. 发明授权

US08311137B1 Method for DC offset removal in OFDM systems 有权
标题翻译： OFDM系统中DC偏移去除的方法
公开(公告)号：US08311137B1
公开(公告)日：2012-11-13
申请号：US12354136
申请日：2009-01-15
申请人： Rohit U. Nabar , Hongyuan Zhang
发明人： Rohit U. Nabar , Hongyuan Zhang
IPC分类号： H04K1/10
CPC分类号： H04L25/061 , H04L25/03993 , H04L25/062 , H04L25/067 , H04L27/2657 , H04L27/2689
摘要： Systems and methods for removing a DC offset from an orthogonal frequency division multiplexed (OFDM) signal transmitted over a plurality of subcarrier frequencies. The system includes a receiver. The system further includes a high pass DC component filter configured to reduce a DC component of the orthogonal frequency division multiplexed signal, the high pass DC component filter shaping noise in the orthogonal frequency division multiplexed signal which results in a non-uniform power spectral density of the noise across the plurality of subcarrier frequencies. The system further includes a noise whitener configured to compensate for the noise shaping by the high pass DC component filter by normalizing the non-uniform power spectral density of the noise across the plurality of subcarrier frequencies.
摘要翻译：用于从通过多个子载波频率发送的正交频分复用（OFDM）信号中去除DC偏移的系统和方法。该系统包括一个接收器。该系统还包括高通DC分量滤波器，其被配置为减少正交频分复用信号的DC分量，正交频分复用信号中的高通DC分量滤波器整形噪声，其导致不均匀的功率谱密度跨多个子载波频率的噪声。该系统还包括噪声增益器，其被配置为通过对跨多个子载波频率的噪声的非均匀功率谱密度进行归一化来补偿高通DC分量滤波器的噪声整形。

119. 发明授权

US07978781B2 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：US07978781B2
公开(公告)日：2011-07-12
申请号：US12785234
申请日：2010-05-21
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： H04B7/02 , H04B1/40 , H04L23/02
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 first packet is transmitted via a forward channel corresponding to a signal direction from a first transceiver device to a second transceiver device, wherein the first packet includes a request to initiate calibration. A partial dimensional description of a reverse channel is determined based on the reception of a second packet received from the second transceiver device, wherein the second packet includes training information of spatial dimensions used for the transmission of the second packet but does not include training information for all available spatial dimensions of a reverse channel. A correction matrix is developed from the partial dimensional description of the reverse channel and a description of the forward channel, and the correction matrix and a steering matrix is used to process signals to be transmitted via the forward channel.
摘要翻译：第一分组经由与从第一收发器设备到第二收发器设备的信号方向对应的前向信道发送，其中第一分组包括启动校准的请求。基于从第二收发器设备接收到的第二分组的接收来确定反向信道的部分维度描述，其中第二分组包括用于传输第二分组的空间维度的训练信息，但不包括用于反向通道的所有可用空间维度。从反向信道的部分维度描述和正向信道的描述开发校正矩阵，并且使用校正矩阵和导引矩阵来处理要经由前向信道发送的信号。

120. 发明申请

US20090285269A1 PHY Preamble Format for Wireless Communication System 有权
标题翻译：无线通信系统的PHY前导格式
公开(公告)号：US20090285269A1
公开(公告)日：2009-11-19
申请号：US12419460
申请日：2009-04-07
申请人： Hongyuan Zhang , Rohit U. Nabar , Songping Wu
发明人： Hongyuan Zhang , Rohit U. Nabar , Songping Wu
IPC分类号： H04B1/707
CPC分类号： H04W56/001 , H04B1/7073 , H04B1/70735 , H04B2201/7073 , H04J13/0014 , H04J13/10 , H04L5/0016 , H04L27/2613 , H04L27/262 , H04L27/2656 , H04L27/2662 , H04W56/00
摘要： A system and method of extracting data from data packets transmitted over a wireless network includes receiving a data packet having a preamble portion and a payload portion. The preamble portion is cross correlated with a first known spreading sequence to generate a first timing signal and the preamble portion is cross correlated with a second known spreading signal to generate a frame timing signal. An impulse is detected in the first timing signal and a first timing parameter is set based upon the detected impulse in the first timing signal. An impulse is detected in the frame timing signal and a frame timing parameter is set based upon the detected impulse in the frame timing signal. Data is extracted from the received payload portion according to the first timing parameter and the frame timing parameter.
摘要翻译：从通过无线网络发送的数据分组中提取数据的系统和方法包括：接收具有前同步码部分和有效载荷部分的数据分组。前导码部分与第一已知扩展序列交叉相关，以产生第一定时信号，并且前同步码部分与第二已知扩展信号相互相关，以产生帧定时信号。在第一定时信号中检测到脉冲，并且基于第一定时信号中检测到的脉冲设置第一定时参数。在帧定时信号中检测到脉冲，并且基于帧定时信号中检测到的脉冲设置帧定时参数。根据第一定时参数和帧定时参数从接收到的有效载荷部分提取数据。

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