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21. 发明授权

US08873484B1 Hybrid beamforming architecture 有权
标题翻译：混合波束成形架构
公开(公告)号：US08873484B1
公开(公告)日：2014-10-28
申请号：US13285188
申请日：2011-10-31
申请人： Ying-Cheng Lee , Timothy J. Donovan , Dharmesh C. Bhagatwala , Ken Kinwah Ho , Hongyuan Zhang , Rohit U. Nabar , Tsunglun Yu
发明人： Ying-Cheng Lee , Timothy J. Donovan , Dharmesh C. Bhagatwala , Ken Kinwah Ho , Hongyuan Zhang , Rohit U. Nabar , Tsunglun Yu
IPC分类号： H04W4/00
CPC分类号： H04B7/0617 , H04B7/046 , H04B7/0626 , H04B7/0634 , H04B7/0689 , H04B7/0871
摘要： Systems, methods, and other embodiments associated with a hybrid beamforming architecture are described. According to one embodiment, an apparatus includes a beamforming mode detection logic configured to select a beamforming mode based, at least in part, on a packet received from a wireless device. The apparatus also includes a beamformee unit and a beamformer unit. The beamformee unit is configured to derive steering information from channel related information in the packet. The beamformer unit is configured to provide weights from a steering matrix to a transmitter performing transmit beamforming on a subsequent packet being transmitted to the wireless device. The beamforming mode detection logic routes at least part of the packet to one or both of the beamformee unit and the beamformer unit based, at least in part, on the selected beamforming mode.
摘要翻译：描述了与混合波束形成架构相关联的系统，方法和其他实施例。根据一个实施例，一种装置包括波束形成模式检测逻辑，其被配置为至少部分地基于从无线设备接收的分组来选择波束成形模式。该装置还包括波束形成单元和波束形成单元。波束形成单元被配置为从分组中的信道相关信息中导出转向信息。波束形成器单元被配置为从发送到无线设备的后续分组提供从导向矩阵到发射机执行发射波束成形的权重。至少部分地基于所选择的波束形成模式，波束形成模式检测逻辑将分组的至少一部分路由到波束形成单元和波束形成单元中的一个或两个。

22. 发明授权

US08724720B2 Methods and apparatus for WLAN transmission 有权
标题翻译： WLAN传输的方法和装置
公开(公告)号：US08724720B2
公开(公告)日：2014-05-13
申请号：US12846681
申请日：2010-07-29
申请人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar
发明人： Sudhir Srinivasa , Hongyuan Zhang , Rohit U. Nabar
IPC分类号： H04L27/28
CPC分类号： H04L1/0005 , H04L1/0016 , H04L27/2607 , H04L27/2608 , H04L27/34 , H04W84/12
摘要： In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, a first set of modulation coding schemes (MCSs) and a second set of MCSs that correspond to a number of spatial streams and a number of encoders are provided. The first set of MCSs correspond to a first channel bandwidth and the second set of MCSs correspond to a second channel bandwidth, and the first set of MCSs is different than the second set of MCSs. An MCS is selected from the first set of MCSs when the PHY data unit is to be transmitted using a channel having the first channel bandwidth, and the MCS is selected from the second set of MCSs when the PHY data unit is to be transmitted using a channel having the second channel bandwidth. Information bits are encoded using the number of encoders and according to the selected MCS, and the encoded information bits are parsed into the number of spatial streams. The encoded information bits are modulated according to the MCS, and a plurality of OFDM symbols are formed based on the modulated encoded information bits.
摘要翻译：在用于生成经由通信信道进行传输的物理层（PHY）数据单元的方法中，与多个空间流和多个编码器相对应的第一组调制编码方案（MCS）和第二组MCS相对应，提供。第一组MCS对应于第一信道带宽，并且第二组MCS对应于第二信道带宽，并且第一组MCS不同于第二组MCS。当要使用具有第一信道带宽的信道来发送PHY数据单元时，从第一组MCS中选择MCS，并且当使用第一组MCS发送PHY数据单元时，从第二组MCS中选择MCS 信道具有第二信道带宽。使用编码器的数量并根据所选择的MCS对信息比特进行编码，并将编码的信息比特解析为空间流的数量。编码信息比特根据MCS进行调制，并且基于调制编码信息比特形成多个OFDM符号。

23. 发明授权

US08638875B1 Transmit beamforming systems and methods 有权
标题翻译：发射波束成形系统和方法
公开(公告)号：US08638875B1
公开(公告)日：2014-01-28
申请号：US12407345
申请日：2009-03-19
申请人： Hongyuan Zhang , Rohit U. Nabar
发明人： Hongyuan Zhang , Rohit U. Nabar
IPC分类号： H04L27/00 , H04L1/02 , H04K1/10 , H04B7/02
CPC分类号： H04B7/0689 , H04B7/0413 , H04B7/0617 , H04K1/10 , H04K3/224 , H04K2203/32 , H04L1/0003 , H04L5/0023 , H04L5/0044 , H04L5/0091 , H04L27/2626
摘要： A system includes a transmitting module, a mapping module, and an updating module. The transmitting module transmits a first set of data streams using N subcarriers when a wireless device operates in a first mode. The transmitting module transmits a second set of data streams using M subcarriers when the device operates in a second mode. N and M are integers greater than or equal to 1. The mapping module maps the first set of data streams to a first set of antennas of the device based on a first set of mapping values and maps the second set of data streams to a second set of antennas of the device based on a second set of mapping values. The updating module generates the second set of mapping values based on the first set of mapping values when the device transitions from the first mode to the second mode.
摘要翻译：系统包括发送模块，映射模块和更新模块。当无线设备以第一模式操作时，发送模块使用N个子载波发送第一组数据流。当设备以第二模式操作时，发射模块使用M个子载波发送第二组数据流。 N和M是大于或等于1的整数。映射模块基于第一组映射值将第一组数据流映射到设备的第一组天线，并将第二组数据流映射到第二组基于第二组映射值的设备的天线集合。当设备从第一模式转换到第二模式时，更新模块基于第一组映射值生成第二组映射值。

24. 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.

25. 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。

26. 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。

27. 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。

28. 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。

29. 发明授权

US08195112B1 Time-reversal-based communication 有权
标题翻译：基于时间反转的沟通
公开(公告)号：US08195112B1
公开(公告)日：2012-06-05
申请号：US12481884
申请日：2009-06-10
申请人： Hongyuan Zhang , Arul Durai Murugan Palanivelu , Rohit U. Nabar , Songping Wu , Hui-Ling Lou
发明人： Hongyuan Zhang , Arul Durai Murugan Palanivelu , Rohit U. Nabar , Songping Wu , Hui-Ling Lou
IPC分类号： H01Q11/12 , H04B1/04
CPC分类号： H04W52/225 , H04W52/226
摘要： Time-reversal filtering may be used to temporally focus a signal to be transmitted. Power can be reduced at the transmitter so that the temporally focused signal is within spectral mask requirements. In one embodiment, the effect of the time-reversal filter on the power spectral density for a particular transmitted signal can be calculated and the predicted power spectral density can be compared to the permitted spectral mask to identify violations, if any, of the spectral mask. The transmitter power can then be reduced by the amount of the violation. In another embodiment, a set of different time-reversal filters that meet the spectral mask requirements can be provided in advance, and the most appropriate filter—e.g., the one with the best signal-to-noise ratio for the particular signal—can be chosen from the set of filters.
摘要翻译：可以使用时间反转滤波来暂时聚焦待传输的信号。在发射机处可以降低功率，使得时间聚焦的信号在频谱掩模要求之内。在一个实施例中，可以计算时间反转滤波器对于特定发射信号的功率谱密度的影响，并且可以将预测的功率谱密度与允许的光谱掩模进行比较以识别光谱掩模（如果有的话）。然后可以将发射机功率减少违规量。在另一个实施例中，可以预先提供满足频谱掩模要求的一组不同的时间反转滤波器，并且最合适的滤波器（例如，对于特定信号具有最佳信噪比的滤波器）可以是从一组过滤器中选择。

30. 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。

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