公开(公告)号：US07847732B1

公开(公告)日：2010-12-07

申请号：US12535349

申请日：2009-08-04

Applicant: Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

Inventor： Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

IPC: H01Q3/00

CPC classification number: H04B7/0417 ,  H01Q3/267 ,  H04B7/0617 ,  H04B7/0621 ,  H04B7/0626 ,  H04B7/0634

Abstract: A first network device includes a calibration module configured to receive a training signal from a second network device. The training signal indicates the second network device is capable of adjusting beamforming weights associated with the second network device based on a steering matrix received from the first network device. A steering module is configured to determine a first steering matrix for the second network device based on the training signal. The steering module is configured to transmit the first steering matrix to the second network device for adjustment of the beamforming weights associated with the second network device.

Abstract translation: 第一网络设备包括被配置为从第二网络设备接收训练信号的校准模块。 训练信号指示第二网络设备能够基于从第一网络设备接收到的导向矩阵来调整与第二网络设备相关联的波束成形权重。 转向模块被配置为基于训练信号确定第二网络设备的第一导引矩阵。 转向模块被配置为将第一导向矩阵发送到第二网络设备，用于调整与第二网络设备相关联的波束成形权重。

公开(公告)号：US08331502B1

公开(公告)日：2012-12-11

申请号：US13236036

申请日：2011-09-19

Applicant: Rohit Nabar ,  Kedar Shirali

Inventor： Rohit Nabar ,  Kedar Shirali

IPC: H04L27/06 ,  H04L27/28 ,  H04J11/00

CPC classification number: H04L25/0206 ,  H04L25/022 ,  H04L25/0224

Abstract: A method and apparatus for estimating a frequency response of a channel. The method includes adjusting phase components of estimates of the frequency response to provide phase-adjusted estimates; performing a smoothing operation on the phase-adjusted estimates to provide smoothed phase-adjusted estimates; and generating an output of a reverse phase adjustment, wherein the reverse phase adjustment is performed on the smoothed phase-adjusted estimates.

Abstract translation: 一种用于估计频道的频率响应的方法和装置。 该方法包括调整频率响应的估计的相位分量以提供相位调整的估计; 对经过调整后的估计进行平滑运算，以提供平滑的相位调整估计; 并产生反向相位调整的输出，其中对平滑的相位调整的估计执行反向相位调整。

公开(公告)号：US08040982B1

公开(公告)日：2011-10-18

申请号：US11483057

申请日：2006-07-06

Applicant: Rohit Nabar ,  Kedar Shirali

Inventor： Rohit Nabar ,  Kedar Shirali

IPC: H04L27/06 ,  H04L27/28 ,  H04J11/00

CPC classification number: H04L25/0206 ,  H04L25/022 ,  H04L25/0224

Abstract: The disclosed technology relates to estimating the frequency response of a frequency division multiplexed (FDM) channel. In accordance with one aspect of the invention, a channel estimation circuit of a receiver can compute initial estimates of the frequency response of sub-channels in the FDM channel. A phase adjustment circuit can adjust the phase components of the initial estimates to provide phase-adjusted estimates. A smoothing circuit can apply a smoothing operation to the phase-adjusted estimates to provide smoothed phase-adjusted estimates. When necessary, a reverse phase adjustment circuit can reverse the phase adjustment by adjusting the phase components of the smoothed phase-adjusted estimates to provide final channel estimates.

Abstract translation: 所公开的技术涉及估计频分复用（FDM）信道的频率响应。 根据本发明的一个方面，接收机的信道估计电路可以计算FDM信道中子信道的频率响应的初始估计。 相位调整电路可以调整初始估计的相位分量，以提供相位调整的估计。 平滑电路可以对经阶段调整的估计值进行平滑处理，以提供平滑的相位调整估计。 必要时，反向相位调整电路可以通过调整平滑的相位调整估计的相位分量来反转相位调整，以提供最终的信道估计。

公开(公告)号：US07570210B1

公开(公告)日：2009-08-04

申请号：US11481142

申请日：2006-07-05

Applicant: Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

Inventor： Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

IPC: H01Q3/00

CPC classification number: H04B7/0417 ,  H01Q3/267 ,  H04B7/0617 ,  H04B7/0621 ,  H04B7/0626 ,  H04B7/0634

Abstract: A network device includes a calibration module that receives a first channel state information (CSI) matrix from a link partner, that determines CSI based on radio frequency (RF) signals transmitted from the link partner, and that generates a second CSI matrix that includes the CSI for the RF signals. The network device includes a first steering module that determines a first steering matrix based on the first CSI matrix, a control module that adjusts beamforming weights based on the first steering matrix, and a second steering module that determines a second steering matrix based on the second CSI matrix and that transmits the second steering matrix to the link partner.

Abstract translation: 网络设备包括校准模块，该校准模块从链路伙伴接收基于从链路伙伴发送的射频（RF）信号的CSI的第一信道状态信息（CSI）矩阵，并且生成包括 CSI用于RF信号。 所述网络设备包括：第一转向模块，其基于所述第一CSI矩阵来确定第一导向矩阵;控制模块，其基于所述第一导向矩阵来调整波束成形权重;以及第二转向模块，所述第二转向模块基于所述第二控制矩阵确定第二导引矩阵 CSI矩阵，并将第二导引矩阵发送给链路伙伴。

公开(公告)号：US20080089396A1

公开(公告)日：2008-04-17

申请号：US11857297

申请日：2007-09-18

Applicant: Hongyuan Zhang ,  Rohit Nabar ,  Kedar Shirali ,  Peter Loc

Inventor： Hongyuan Zhang ,  Rohit Nabar ,  Kedar Shirali ,  Peter Loc

IPC: H04J3/16

CPC classification number: H04B7/0413 ,  H04B7/0617 ,  H04B17/21 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

Abstract: 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.

Abstract translation: 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：US08494084B1

公开(公告)日：2013-07-23

申请号：US11598563

申请日：2006-11-13

Applicant: Rohit Nabar ,  Kedar Shirali ,  Hui-Ling Lou

Inventor： Rohit Nabar ,  Kedar Shirali ,  Hui-Ling Lou

IPC: H04L25/49

CPC classification number: H04B7/043 ,  H04B7/0413 ,  H04B7/0617 ,  H04B7/0669 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/06 ,  H04L25/03961

Abstract: A beamforming technique used in a MIMO wireless transmission system determines a transmitter beamforming steering matrix using a matrix equalizer of a transmitter or a receiver within the MIMO communication system, to thereby increase the speed and/or to decrease the processing needed to implement effective beamforming within the transmitter of the communication system. While this beamforming technique may not provide the best possible set of steering coefficients that obtain the best possible transmission and reception in the communication system, this technique can provide increased performance over no beamforming without significantly increasing the processing overhead of the transmission system. This beamforming technique can used when a transmitter, with multiple transmitter antennas, is used to communicate with one or with multiple receivers within the communication system.

Abstract translation: 在MIMO无线传输系统中使用的波束成形技术使用MIMO通信系统内的发射机或接收机的矩阵均衡器确定发射机波束成形导引矩阵，从而提高速度和/或减少实现有效波束成形所需的处理 通信系统的发射机。 虽然该波束形成技术可能不提供在通信系统中获得最佳可能传输和接收的最佳可能的转向系数集合，但是该技术可以在无波束成形的情况下提供更高的性能，而不会显着增加传输系统的处理开销。 当具有多个发射机天线的发射机用于与通信系统内的一个或多个接收机通信时，可以使用该波束成形技术。

公开(公告)号：US08451931B1

公开(公告)日：2013-05-28

申请号：US13403949

申请日：2012-02-23

Applicant: Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou ,  Rohit Nabar ,  Yakun Sun

Inventor： Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou ,  Rohit Nabar ,  Yakun Sun

IPC: H04B7/00

CPC classification number: H04L27/2627 ,  H04B7/0413 ,  H04B7/0669 ,  H04B7/0671 ,  H04L1/0625 ,  H04L5/0023 ,  H04L5/0087 ,  H04L25/0204 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: A plurality of diagonal matrices Ci is determined, where the plurality of diagonal matrices Ci is for modifying a plurality of transmit signals to be transmitted via a plurality of transmit antennas, each diagonal matrix Ci for modifying an i-th block of sub-carriers, adjacent in frequency, in the plurality of transmit signals. The plurality of diagonal matrices Ci is used to modify the plurality of transmit signals to implement transmit diversity.

公开(公告)号：US08442450B1

公开(公告)日：2013-05-14

申请号：US13442301

申请日：2012-04-09

Applicant: Rohit Nabar ,  Hui-Ling Lou

Inventor： Rohit Nabar ,  Hui-Ling Lou

IPC: H04B1/00

CPC classification number: H04W72/1226 ,  H04L25/0206 ,  H04L25/0226 ,  H04L27/2613

Abstract: A network device includes a first feedback module and a first calibration module. The first feedback module selectively generates a first transmission schedule that is transmitted to a link partner, wherein the first transmission schedule includes a first matrix map. The first calibration module selectively transmits a first set of training signals to the link partner, receives a first set of channel state information (CSI) for the training signals from the link partner according to the first transmission schedule, and generates a first CSI matrix based on the first set of CSI and the first matrix map.

Abstract translation: 网络设备包括第一反馈模块和第一校准模块。 第一反馈模块选择性地产生被发送到链路伙伴的第一传输调度，其中第一传输调度包括第一矩阵图。 第一校准模块选择性地向链路伙伴发送第一组训练信号，根据第一传输调度从链路伙伴接收针对训练信号的第一组信道状态信息（CSI），并产生基于第一CSI矩阵的第一CSI矩阵 在第一组CSI和第一个矩阵图。

公开(公告)号：US08345795B1

公开(公告)日：2013-01-01

申请号：US13407435

申请日：2012-02-28

Applicant: Jungwon Lee ,  Rohit Nabar ,  Hui-Ling Lou

Inventor： Jungwon Lee ,  Rohit Nabar ,  Hui-Ling Lou

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC classification number: H04B7/0408 ,  H04B1/00 ,  H04B7/0417 ,  H04B7/0465 ,  H04B7/0473 ,  H04B7/0663 ,  H04L5/0023 ,  H04L25/0204 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: A system and method of beamforming may reduce feedback requirements. In some implementations, a beamforming technique may employ a diagonal matrix as a beamforming matrix along with a stream-to-transmit antenna mapping matrix. In some antenna phase beamforming strategies, a diagonal beamforming matrix in which the diagonal elements have a constant magnitude may be employed. Accordingly, a beamforming system may be utilized with few feedback information bits being transmitted from the beamformee; such a system may also minimize or eliminate power fluctuations among multiple transmit antennae.

Abstract translation: 波束成形的系统和方法可以减少反馈要求。 在一些实现中，波束形成技术可以采用对角矩阵作为波束形成矩阵以及流到发射天线映射矩阵。 在一些天线相位波束形成策略中，可以采用其中对角元素具有恒定幅度的对角波束形成矩阵。 因此，可以利用波束形成系统，而从波束形成器发送的反馈信息比特数很少; 这样的系统还可以最小化或消除多个发射天线之间的功率波动。

公开(公告)号：US08878724B1

公开(公告)日：2014-11-04

申请号：US12959088

申请日：2010-12-02

Applicant: Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

Inventor： Rohit Nabar ,  Hui-Ling Lou ,  Peter Loc

IPC: H01Q3/34 ,  H04B7/06 ,  H04B7/04

CPC classification number: H04B7/0417 ,  H01Q3/267 ,  H04B7/0617 ,  H04B7/0621 ,  H04B7/0626 ,  H04B7/0634

Abstract: A first network device including a calibration module, a steering module, and a control module. The calibration module is configured to determine whether a second network device is capable of generating steering data for the first network device, wherein the steering data corresponds to data for steering signals in a desired direction. The steering module is configured to, if the second network device is not capable of generating the steering data for the first network device, receive channel state information from the second network device and determine the steering data based on the channel state information. The control module is configured to receive the steering data from the second network device if the second network device is capable of generating the steering data for the first network device.

Abstract translation: 包括校准模块，转向模块和控制模块的第一网络设备。 校准模块被配置为确定第二网络设备是否能够生成用于第一网络设备的转向数据，其中所述操纵数据对应于期望方向上的转向信号的数据。 转向模块被配置为：如果第二网络设备不能够产生用于第一网络设备的导向数据，则从第二网络设备接收信道状态信息，并且基于信道状态信息来确定导向数据。 如果第二网络设备能够产生第一网络设备的导向数据，则控制模块被配置为从第二网络设备接收转向数据。