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1. 发明授权

US08451931B1 Method and apparatus for implementing transmit diversity in OFDM systems 有权
公开(公告)号：US08451931B1
公开(公告)日：2013-05-28
申请号：US13403949
申请日：2012-02-23
申请人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou , Rohit Nabar , Yakun Sun
发明人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou , Rohit Nabar , Yakun Sun
IPC分类号： H04B7/00
CPC分类号： H04L27/2627 , H04B7/0413 , H04B7/0669 , H04B7/0671 , H04L1/0625 , H04L5/0023 , H04L5/0087 , H04L25/0204 , H04L25/03159 , H04L2025/03414 , H04L2025/03426
摘要： 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.

2. 发明授权

US08345795B1 System and method of beamforming with reduced feedback 有权
标题翻译：具有减少反馈的波束成形的系统和方法
公开(公告)号：US08345795B1
公开(公告)日：2013-01-01
申请号：US13407435
申请日：2012-02-28
申请人： Jungwon Lee , Rohit Nabar , Hui-Ling Lou
发明人： Jungwon Lee , Rohit Nabar , Hui-Ling Lou
IPC分类号： H04K1/02 , H04L25/03 , H04L25/49
CPC分类号： H04B7/0408 , H04B1/00 , H04B7/0417 , H04B7/0465 , H04B7/0473 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L2025/03414 , H04L2025/03426
摘要： 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.
摘要翻译：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。

3. 发明授权

US07872962B1 System and method for producing weighted signals in a diversity communication system 有权
标题翻译：用于在分集通信系统中产生加权信号的系统和方法
公开(公告)号：US07872962B1
公开(公告)日：2011-01-18
申请号：US11447762
申请日：2006-06-05
申请人： Rohit Nabar , Kedar Shirali , Hui-Ling Lou , Jungwon Lee
发明人： Rohit Nabar , Kedar Shirali , Hui-Ling Lou , Jungwon Lee
IPC分类号： H04J11/00
CPC分类号： H04B7/084 , H04B7/0615 , H04B7/0845 , H04B2201/70706 , H04L25/0232 , H04L27/0014
摘要： The disclosed technology relates to a communication system and method in which multiple versions of a signal are processed to detect the signal. The communication system can include transmitters that communicate different versions of a signal to a receiver. The different versions are weighted versions of the signal and are communicated on different channels. The weight for a weighted signal is based on an inverse of an estimate of the phase shift of the particular channel to which the weighted signal will be communicated. The weights are also based on a unity gain such that each weighted signal has the same magnitude as the original signal. A receiver that receives the weighted signals processes the received signals to detect the original signal.
摘要翻译：所公开的技术涉及其中处理多个版本的信号以检测信号的通信系统和方法。通信系统可以包括将信号的不同版本传送到接收机的发射机。不同的版本是信号的加权版本，并且在不同的信道上进行通信。加权信号的权重基于加权信号将被传送到的特定信道的相移的估计的倒数。权重也基于单位增益，使得每个加权信号具有与原始信号相同的幅度。接收加权信号的接收机处理接收的信号以检测原始信号。

4. 发明授权

US07847732B1 Steering matrix feedback for beamforming 有权
标题翻译：用于波束成形的转向矩阵反馈
公开(公告)号：US07847732B1
公开(公告)日：2010-12-07
申请号：US12535349
申请日：2009-08-04
申请人： Rohit Nabar , Hui-Ling Lou , Peter Loc
发明人： Rohit Nabar , Hui-Ling Lou , Peter Loc
IPC分类号： H01Q3/00
CPC分类号： H04B7/0417 , H01Q3/267 , H04B7/0617 , H04B7/0621 , H04B7/0626 , H04B7/0634
摘要： 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.
摘要翻译：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。

5. 发明授权

US07570210B1 Steering matrix feedback for beamforming 有权
标题翻译：用于波束成形的转向矩阵反馈
公开(公告)号：US07570210B1
公开(公告)日：2009-08-04
申请号：US11481142
申请日：2006-07-05
申请人： Rohit Nabar , Hui-Ling Lou , Peter Loc
发明人： Rohit Nabar , Hui-Ling Lou , Peter Loc
IPC分类号： H01Q3/00
CPC分类号： H04B7/0417 , H01Q3/267 , H04B7/0617 , H04B7/0621 , H04B7/0626 , H04B7/0634
摘要： 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.
摘要翻译：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。

6. 发明授权

US08494084B1 Reuse of a matrix equalizer for the purpose of transmit beamforming in a wireless MIMO communication system 有权
标题翻译：在无线MIMO通信系统中为了发射波束成形的目的重用矩阵均衡器
公开(公告)号：US08494084B1
公开(公告)日：2013-07-23
申请号：US11598563
申请日：2006-11-13
申请人： Rohit Nabar , Kedar Shirali , Hui-Ling Lou
发明人： Rohit Nabar , Kedar Shirali , Hui-Ling Lou
IPC分类号： H04L25/49
CPC分类号： H04B7/043 , H04B7/0413 , H04B7/0617 , H04B7/0669 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/0054 , H04L1/0071 , H04L1/06 , H04L25/03961
摘要： 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.
摘要翻译：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。

7. 发明授权

US08442450B1 Sub-carrier and channel matrix element ordering for receiver feedback 有权
标题翻译：接收机反馈的子载波和信道矩阵元素排序
公开(公告)号：US08442450B1
公开(公告)日：2013-05-14
申请号：US13442301
申请日：2012-04-09
申请人： Rohit Nabar , Hui-Ling Lou
发明人： Rohit Nabar , Hui-Ling Lou
IPC分类号： H04B1/00
CPC分类号： H04W72/1226 , H04L25/0206 , H04L25/0226 , H04L27/2613
摘要： 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.
摘要翻译：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。

8. 发明授权

US08878724B1 Steering matrix feedback for beamforming 有权
标题翻译：用于波束成形的转向矩阵反馈
公开(公告)号：US08878724B1
公开(公告)日：2014-11-04
申请号：US12959088
申请日：2010-12-02
申请人： Rohit Nabar , Hui-Ling Lou , Peter Loc
发明人： Rohit Nabar , Hui-Ling Lou , Peter Loc
IPC分类号： H01Q3/34 , H04B7/06 , H04B7/04
CPC分类号： H04B7/0417 , H01Q3/267 , H04B7/0617 , H04B7/0621 , H04B7/0626 , H04B7/0634
摘要： 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.
摘要翻译：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。

9. 发明授权

US08155597B2 Transmission scheduling for receiver feedback 有权
标题翻译：接收机反馈的传输调度
公开(公告)号：US08155597B2
公开(公告)日：2012-04-10
申请号：US11526319
申请日：2006-09-25
申请人： Rohit Nabar , Hui-Ling Lou
发明人： Rohit Nabar , Hui-Ling Lou
IPC分类号： H04B1/00
CPC分类号： H04W72/1226 , H04L25/0206 , H04L25/0226 , H04L27/2613
摘要： A network device including a first feedback module and a first calibration module. The first feedback module generates a first transmission schedule, which include (i) a first subcarrier schedule to determine an order of transmitting subcarriers and (ii) a first matrix map, and which is transmitted to a link partner. The first calibration module transmits a first set of training signals to the link partner, receives a first set of channel state information (CSI) (i) generated by the link partner based on the training signals and (ii) transmitted by 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. The first calibration module is configured to (i) generate the same first set of training signals for each of the subcarriers and (ii) receive the first set of CSI for each of the subcarriers.
摘要翻译：一种网络设备，包括第一反馈模块和第一校准模块。第一反馈模块产生第一传输调度，其包括（i）用于确定发送子载波的顺序的第一子载波调度和（ii）第一矩阵图，并且被发送到链路伙伴。所述第一校准模块将第一组训练信号发送到所述链路伙伴，基于所述训练信号接收由所述链路伙伴生成的第一组信道状态信息（CSI）（i），以及（ii）由所述链路伙伴发送的第并且基于第一组CSI和第一矩阵图生成第一CSI矩阵。第一校准模块被配置为（i）为每个子载波生成相同的第一组训练信号，并且（ii）为每个子载波接收第一组CSI。

10. 发明授权

US07787554B1 Beamforming to a subset of receive antennas in a wireless MIMO communication system 有权
标题翻译：在无线MIMO通信系统中对接收天线的子集进行波束成形
公开(公告)号：US07787554B1
公开(公告)日：2010-08-31
申请号：US11627265
申请日：2007-01-25
申请人： Rohit Nabar , Hui-Ling Lou
发明人： Rohit Nabar , Hui-Ling Lou
IPC分类号： H04B7/02 , H04B1/40
CPC分类号： H04B7/0473 , H04B7/0408 , H04B7/0417 , H04B7/043 , H04B7/061 , H04B7/0874
摘要： A beamforming technique used in a MIMO wireless transmission system performs beamforming based on a subset of the receiver antennas within the communication system to increase the speed and/or to decrease the processing needed to implement effective beamforming at the transmitter of the MIMO system. This beamforming technique can provide increased performance over no beamforming without significantly increasing the processing overhead of the transmission system, especially when a large number of receiver antennas are present at a receiver of the MIMO system. This beamforming technique can additionally be used when a transmitter, with multiple transmission antennas, is used to communicate with multiple receivers, each of which includes one or more receiver antennas. In this case, the beamforming technique may select a subset of the receiver antennas that includes, for example, one receiver antenna from each of the receivers, and may then beamform to the selected subset of receiver antennas.
摘要翻译：在MIMO无线传输系统中使用的波束成形技术基于通信系统内的接收机天线的子集来执行波束成形，以增加速度和/或减少在MIMO系统的发射机处实现有效的波束成形所需的处理。这种波束成形技术可以在无波束形成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，特别是当在MIMO系统的接收机处存在大量的接收机天线时。当具有多个发射天线的发射机被用于与多个接收机进行通信时，还可以使用该波束成形技术，每个接收机包括一个或多个接收机天线。在这种情况下，波束形成技术可以选择接收机天线的子集，其包括例如来自每个接收机的一个接收机天线，然后可以波束形成所选择的接收机天线的子集。

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