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1. 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。

2. 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。

3. 发明授权

US07924930B1 Robust synchronization and detection mechanisms for OFDM WLAN systems 有权
标题翻译： OFDM WLAN系统的鲁棒同步和检测机制
公开(公告)号：US07924930B1
公开(公告)日：2011-04-12
申请号：US11642442
申请日：2006-12-20
申请人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
发明人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
IPC分类号： H04K1/10 , H04L27/28 , H04B7/02 , H04L1/02
CPC分类号： H04B7/0857 , H04B7/084 , H04L2025/03414 , H04L2025/03426
摘要： A synchronization module for an orthogonal frequency-division multiplexing (OFDM) receiver system including a signal combination module that generates N combination signals that correspond to N received signals by performing at least one of weighted combining and selection and equal-gain-combining (EGC) on the N signals. A weighted signal generator module generates N weighted signals based on the N combination signals. N is an integer greater than one.
摘要翻译：一种用于正交频分复用（OFDM）接收机系统的同步模块，包括信号组合模块，其通过执行加权组合和选择以及等增益组合（EGC）中的至少一个来产生对应于N个接收信号的N个组合信号，对N信号。加权信号发生器模块基于N个组合信号产生N个加权信号。 N是大于1的整数。

4. 发明授权

US08094744B1 System and method of selecting a data detection technique for a multiple-input multiple-output (MIMO) system 有权
标题翻译：选择多输入多输出（MIMO）系统的数据检测技术的系统和方法
公开(公告)号：US08094744B1
公开(公告)日：2012-01-10
申请号：US12111143
申请日：2008-04-28
申请人： Leilei Song , Rohit U. Nabar , Hui-Ling Lou , Kedar Shirali
发明人： Leilei Song , Rohit U. Nabar , Hui-Ling Lou , Kedar Shirali
IPC分类号： H04B7/02
CPC分类号： H04L27/0008 , H04L1/0003 , H04L1/0009 , H04L1/0036 , H04L27/22 , H04L27/38
摘要： A system and method of selecting a data detector alternately implement different data detection techniques such as maximum likelihood, zero forcing, and minimum mean square error. Selection of a particular technique may depend upon various factors. In some implementations, a decision whether to employ a specific strategy may be based upon a modulation and coding scheme utilized by the multiple-input, multiple-output (MIMO) system.
摘要翻译：选择数据检测器的系统和方法交替实现不同的数据检测技术，例如最大似然，迫零和最小均方误差。特定技术的选择可能取决于各种因素。在一些实现中，是否采用特定策略的决定可以基于由多输入多输出（MIMO）系统使用的调制和编码方案。

5. 发明申请

US20100232475A1 Equal Power Output Spatial Spreading Matrix for Use in a Wireless MIMO Communication System 有权
标题翻译：用于无线MIMO通信系统的等功率输出空间扩频矩阵
公开(公告)号：US20100232475A1
公开(公告)日：2010-09-16
申请号：US12788081
申请日：2010-05-26
申请人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
发明人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
IPC分类号： H04B1/00
CPC分类号： H04B7/0678 , H04L1/06
摘要： A spatial spreading unit is configured to utilize a spatial spreading matrix to distribute two or more encoded spatial data streams to transmission antennas. The spatial spreading matrix has components (i) associated with each row of a row dimension having a number of rows equal to the number of the transmission antennas to be used to transmit the encoded spatial data streams and (ii) associated with each column of a column dimension having a number of columns equal to the number of the encoded spatial data streams to be transmitted. Additionally, the spatial spreading matrix satisfies one or more of the following two constraints: (1) the ratio of squared norms of the sum of the components of a row, for different rows of the spatial spreading matrix, is equal to a first constant sequence, and (2) the ratio of squared norms of the sum of a symbol Sl to be transmitted, when the symbol Sl is equal to 1 or −1, multiplied by each of the components of a row, for different rows of the spatial spreading matrix, is equal to a second constant sequence.
摘要翻译：空间扩展单元被配置为利用空间扩展矩阵将两个或更多个经编码的空间数据流分配到发射天线。空间扩展矩阵具有与行尺寸的每行相关联的组件（i），其具有等于要用于发送编码的空间数据流的发送天线的数量的行数，以及（ii）与每个列相关联的列尺寸具有等于要发送的编码空间数据流的数量的列数。此外，空间扩展矩阵满足以下两个约束中的一个或多个：（1）对于空间扩展矩阵的不同行，行的分量之和的平方范数的比等于第一常数序列，和（2）当符号S1等于1或-1时，要发送的符号S1的和的平方值的比值乘以一行的每个分量，对于不同的空间扩展行矩阵等于第二个常数序列。

6. 发明授权

US07751495B1 Equal power output spatial spreading matrix for use in a wireless MIMO communication system 有权
标题翻译：用于无线MIMO通信系统的等功率输出空间扩展矩阵
公开(公告)号：US07751495B1
公开(公告)日：2010-07-06
申请号：US11851237
申请日：2007-09-06
申请人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
发明人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
IPC分类号： H04B7/02 , H04L23/02 , H04B1/40
CPC分类号： H04B7/0678 , H04L1/06
摘要： A wireless communication system uses a spatial spreading matrix to simultaneously transmit various different streams of encoded symbol data simultaneously via multiple transmission antennas, wherein the spatial spreading matrix is designed to assure that the different transmission antennas provide equal power output in the presence of both correlated and uncorrelated data within the different encoded symbol streams. The use of this spatial spreading matrix reduces or eliminates the condition in which a particular one of the transmission antennas needs to operate at an output power that is significantly higher than the others of the transmission antennas, which might lead to saturation of, or to the non-linear or abnormal operation of a power amplifier associated with the particular transmission antenna, resulting in improper amplification for that particular transmission antenna.
摘要翻译：无线通信系统使用空间扩展矩阵同时通过多个发射天线发射各种不同的编码符号数据流，其中空间扩展矩阵被设计为确保不同的发射天线在存在相关和相关的情况下提供相等的功率输出不同编码符号流内的不相关数据。这种空间扩展矩阵的使用减少或消除了特定一个发射天线需要以明显高于发射天线其他发射天线的输出功率来工作的条件，这可能导致饱和，与特定发射天线相关联的功率放大器的非线性或异常操作，导致该特定发射天线的不正确的放大。

7. 发明授权

US08369469B1 Robust synchronization and detection mechanisms for OFDM WLAN systems 有权
标题翻译： OFDM WLAN系统的鲁棒同步和检测机制
公开(公告)号：US08369469B1
公开(公告)日：2013-02-05
申请号：US13085350
申请日：2011-04-12
申请人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
发明人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
IPC分类号： H04L25/08
CPC分类号： H04B7/0857 , H04B7/084 , H04L2025/03414 , H04L2025/03426
摘要： A method including: receiving, through a wireless channel, a plurality of modulated signals at a plurality of antennas, wherein each antenna receives a corresponding modulated signal; generating a plurality of autocorrelated signals by autocorrelating the plurality of modulated signals; determining whether a signal strength associated with each modulated signal is (i) below a threshold or (ii) above the threshold; for each modulated signal having a signal strength below the threshold, disabling the antenna that received the modulated signal having the signal strength below the threshold; combining the modulated signals having a signal strength above the threshold; generating weighted autocorrelated signals based on (i) the plurality of autocorrelated signals and (ii) the combined modulated signals; generating a combined weighted signal by summing the weighted autocorrelation signals; demodulating the combined weighted signal; and determining a state of the wireless channel based on the demodulation of the combined weighted signal.
摘要翻译：一种方法，包括：通过无线信道在多个天线处接收多个调制信号，其中每个天线接收对应的调制信号; 通过对所述多个调制信号进行自相关来生成多个自相关信号; 确定与每个调制信号相关联的信号强度是否是（i）低于阈值或（ii）高于阈值; 对于具有低于阈值的信号强度的每个调制信号，禁用接收到信号强度低于阈值的调制信号的天线; 组合具有高于阈值的信号强度的调制信号; 基于（i）所述多个自相关信号和（ii）所述组合调制信号产生加权自相关信号; 通过对加权的自相关信号求和来产生组合的加权信号; 解调组合加权信号; 以及基于所述组合加权信号的解调来确定所述无线信道的状态。

8. 发明授权

US08477869B1 Equal power output spatial spreading matrix for use in a wireless MIMO communication system 有权
标题翻译：用于无线MIMO通信系统的等功率输出空间扩展矩阵
公开(公告)号：US08477869B1
公开(公告)日：2013-07-02
申请号：US13567763
申请日：2012-08-06
申请人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
发明人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
IPC分类号： H04B7/02 , H04B1/40 , H04L23/02
CPC分类号： H04B7/0678 , H04L1/06
摘要： A symbol encoder unit is configured to produce two or more encoded spatial data streams, wherein a number, NSS, of the encoded spatial data streams is less than a number, NTX, of transmission antennas to be used to transmit the encoded spatial data streams. A spatial spreading unit is configured to utilize a spatial spreading matrix Q to distribute two or more encoded spatial data streams to the transmission antennas. Q has NTX rows and NSS columns, and Q satisfies one or more of the following two constraints:  ∑ l = 1 N SS ⁢ Q ⁡ ( t , l )  2 = A t ⁢ B ( a ) for all t=1 . . . NTX., or  ∑ l = 1 N SS ⁢ S l ⁢ Q ⁡ ( t , l )  2 = A t ⁢ B ( b ) for all t=1 . . . NTX when Sl is equal to (i)−1 or (ii) 1. Q(t,l) is a component of Q at row t, column l, Sl is a symbol in an 1-th spatial stream. B is a constant, and A1, A2, . . . , ANTX is a sequence of constants.
摘要翻译：符号编码器单元被配置为产生两个或更多个编码的空间数据流，其中编码的空间数据流的数量NSS小于要用于发送编码的空间数据流的发送天线的数目NTX。空间扩展单元被配置为利用空间扩展矩阵Q将两个或更多个经编码的空间数据流分配到发射天线。 Q具有NTX行和NSS列，并且Q满足以下两个约束中的一个或多个：Σl = 1 N SS Q⁡（t，l）ert 2 = A t B（a）对于所有t = 1 。。。 NTX。或Σl = 1 N SS S l Q⁡（t，l）ert 2 = A t B（b）对于所有t = 1。。。当S1等于（i）-1或（ii）1时，NTX为（i，i），Q（t，l）为第t列第1列中的Q的分量，S1为第1个空间流中的符号。 B是常数，A1，A2。。。 ANTX是常数序列。

9. 发明授权

US08411786B1 System and method of selecting a data detection technique for a multiple-input multiple-output (MIMO) system 有权
标题翻译：选择多输入多输出（MIMO）系统的数据检测技术的系统和方法
公开(公告)号：US08411786B1
公开(公告)日：2013-04-02
申请号：US13346476
申请日：2012-01-09
申请人： Leilei Song , Nabar U. Rohit , Hui-Ling Lou , Kedar Shirali
发明人： Leilei Song , Nabar U. Rohit , Hui-Ling Lou , Kedar Shirali
IPC分类号： H04B7/02
CPC分类号： H04L27/0008 , H04L1/0003 , H04L1/0009 , H04L1/0036 , H04L27/22 , H04L27/38
摘要： One or more communications parameters associated with a multiple input, multiple output (MIMO) signal transmitted by a transmitter are identified. The one or more communications parameters include one or more of (i) a number of receive antennas via which the MIMO signal is received, (ii) a number of spatial streams in the MIMO signal, and (iii) a signal to noise ratio (SNR) corresponding to the MIMO signal. A particular data detection technique of a plurality of data detection techniques employed by a receiver is selected in accordance with at least one of the one or more communications parameters.
摘要翻译：识别与由发射机发射的多输入多输出（MIMO）信号相关联的一个或多个通信参数。所述一个或多个通信参数包括以下中的一个或多个：（i）接收MIMO信号的多个接收天线，（ii）MIMO信号中的多个空间流，以及（iii）信噪比（ SNR）。根据一个或多个通信参数中的至少一个来选择由接收机采用的多个数据检测技术的特定数据检测技术。

10. 发明授权

US08238466B2 Equal power output spatial spreading matrix for use in a wireless MIMO communication system 有权
标题翻译：用于无线MIMO通信系统的等功率输出空间扩展矩阵
公开(公告)号：US08238466B2
公开(公告)日：2012-08-07
申请号：US12788081
申请日：2010-05-26
申请人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
发明人： Arul Durai Murugan Palanivelu , Hui-Ling Lou , Kedar Shirali , Rohit U. Nabar , Atul Salhotra
IPC分类号： H04B7/02 , H04B1/40 , H04L23/02
CPC分类号： H04B7/0678 , H04L1/06
摘要： A spatial spreading unit is configured to utilize a spatial spreading matrix to distribute two or more encoded spatial data streams to transmission antennas. The spatial spreading matrix has components (i) associated with each row of a row dimension having a number of rows equal to the number of the transmission antennas to be used to transmit the encoded spatial data streams and (ii) associated with each column of a column dimension having a number of columns equal to the number of the encoded spatial data streams to be transmitted. Additionally, the spatial spreading matrix satisfies one or more of the following two constraints: (1) the ratio of squared norms of the sum of the components of a row, for different rows of the spatial spreading matrix, is equal to a first constant sequence, and (2) the ratio of squared norms of the sum of a symbol Sl to be transmitted, when the symbol Sl is equal to 1 or −1, multiplied by each of the components of a row, for different rows of the spatial spreading matrix, is equal to a second constant sequence.
摘要翻译：空间扩展单元被配置为利用空间扩展矩阵将两个或更多个经编码的空间数据流分配到发射天线。空间扩展矩阵具有与行尺寸的每行相关联的组件（i），其具有等于要用于发送编码的空间数据流的发送天线的数量的行数，以及（ii）与每个列相关联的列尺寸具有等于要发送的编码空间数据流的数量的列数。此外，空间扩展矩阵满足以下两个约束中的一个或多个：（1）对于空间扩展矩阵的不同行，行的分量之和的平方范数的比等于第一常数序列，和（2）当符号S1等于1或-1时，要发送的符号S1的和的平方值的比值乘以一行的每个分量，对于不同的空间扩展行矩阵等于第二个常数序列。

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