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。

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。

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。

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。

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。

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。

公开(公告)号：US08275323B1

公开(公告)日：2012-09-25

申请号：US11827958

申请日：2007-07-13

申请人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

发明人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

IPC分类号： H04B17/00

CPC分类号： H04W72/04 ,  H04B17/318 ,  H04W28/04 ,  H04W74/085

摘要： A system including an activity sensing module to sense RF activity in first and second sub-channels of a communication channel of a first wireless network. N adjacent channel interference (ACI) filter modules arranged in parallel receive signals from N antennas, respectively, filter out signals in channels adjacent to the communication channel, and generate N filtered signals, respectively, where N>2. The activity sensing module generates control signals based on the N filtered signals. A channel identification module processes the control signals, and determines that both of the first and second sub-channels are available when the RF activity originating from a second wireless network is not present in both of the first and second sub-channels, and that the first sub-channel is available when the RF activity originating from the second wireless network is present only in the second sub-channel and is less than or equal to a predetermined threshold.

摘要翻译： 一种系统，包括用于感测第一无线网络的通信信道的第一和第二子信道中的RF活动的活动感测模块。 N个天线并行布置的N个相邻信道干扰（ACI）滤波器模块分别接收与通信信道相邻的信道中的信号，并分别产生N个滤波信号，其中N≥2。 活动感测模块根据N个滤波信号产生控制信号。 信道识别模块处理控制信号，并且当源自第二无线网络的RF活动不存在于第一和第二子信道中时，确定第一和第二子信道都可用，并且 当来自第二无线网络的RF活动仅在第二子信道中存在且小于或等于预定阈值时，第一子信道可用。

公开(公告)号：US08838038B1

公开(公告)日：2014-09-16

申请号：US13613996

申请日：2012-09-13

申请人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

发明人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

IPC分类号： H04B17/00 ,  H04W72/04

CPC分类号： H04W72/04 ,  H04B17/318 ,  H04W28/04 ,  H04W74/085

摘要： A system including a plurality of filter modules to respectively communicate with a plurality of antennas, filter signals from channels other than a communication channel of a first wireless network, where the communication channel includes a first channel and a second channel, and generate a plurality of signals. A sensing module senses, based on the plurality of signals, whether radio frequency signals from a second network are present in at least one of the first channel and the second channel, and generates a plurality of control signals indicating presence or absence of the radio frequency signals in at least one of the first channel and the second channel. A channel identification module determines, based on the plurality of control signals, availability of the first channel and the second channel in response to whether the radio frequency signals are present in the first channel and the second channel.

摘要翻译： 一种系统，包括分别与多个天线通信的多个滤波器模块，从除第一无线网络的通信信道之外的信道中滤除信号，其中所述通信信道包括第一信道和第二信道，并且生成多个 信号。 感测模块​​基于多个信号来感测来自第二网络的射频信号是否存在于第一信道和第二信道中的至少一个中，并且生成指示有无射频的多个控制信号 在第一通道和第二通道中的至少一个通道中的信号。 信道识别模块响应于射频信号是否存在于第一信道和第二信道中，基于多个控制信号确定第一信道和第二信道的可用性。

公开(公告)号：US08224272B1

公开(公告)日：2012-07-17

申请号：US11999482

申请日：2007-12-05

申请人： Hongyuan Zhang ,  Zhiyu Yang ,  Kedar Shirali ,  Atul Salhotra

发明人： Hongyuan Zhang ,  Zhiyu Yang ,  Kedar Shirali ,  Atul Salhotra

IPC分类号： H04B17/02 ,  H04B1/16

CPC分类号： H04L27/0012 ,  H04B7/082 ,  H04L23/02 ,  H04L25/0262 ,  H04L27/2071

摘要： A wireless networking receiver with digital antenna switching selects an antenna with an 802.11b signal based on a signal metric, such as the highest signal quality or highest peak amplitude. In one embodiment, the receiver comprises a plurality of antennas that may each receive one of a plurality of RF signals conforming to the IEEE 802.11b standard. The receiver may have multiple antennas for use with the IEEE 802.11n standard, but may receive signals conforming to the 802.11b standard. The receiver also comprises a carrier sense circuit configured to calculate a signal metric for each of the signals and further configured to generate a selection signal signifying one of the signals, based on the signal metric. The receiver further comprises a multiplexer configured to output one of the signals, based on the selection signal. In another embodiment, a wireless networking receiver comprises signal receiving means, carrier sensing means for calculating and selecting a signal based on a signal metric, and multiplexer means to output the signal. A related method 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： 具有数字天线切换的无线网络接收机基于诸如最高信号质量或最高峰值幅度的信号度量来选择具有802.11b信号的天线。 在一个实施例中，接收机包括可以各自接收符合IEEE 802.11b标准的多个RF信号中的一个的多个天线。 接收机可以具有用于IEEE 802.11n标准的多个天线，但是可以接收符合802.11b标准的信号。 接收机还包括被配置为计算每个信号的信号度量的载波侦听电路，并进一步被配置为基于信号度量产生表示信号之一的选择信号。 接收机还包括多路复用器，配置为基于选择信号输出信号之一。 在另一个实施例中，无线联网接收机包括信号接收装置，用于基于信号度量计算和选择信号的载波检测装置，以及用于输出信号的多路复用装置。 还公开了相关方法。 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。

公开(公告)号：US08483634B1

公开(公告)日：2013-07-09

申请号：US13549887

申请日：2012-07-16

申请人： Hongyuan Zhang ,  Zhiyu Yang ,  Kedar Shirali ,  Atul Salhotra

发明人： Hongyuan Zhang ,  Zhiyu Yang ,  Kedar Shirali ,  Atul Salhotra

IPC分类号： H04B17/02 ,  H04B1/16

CPC分类号： H04L27/0012 ,  H04B7/082 ,  H04L23/02 ,  H04L25/0262 ,  H04L27/2071

摘要： A wireless networking receiver with digital antenna switching selects an antenna with an 802.11b signal based on a signal metric, such as the highest signal quality or highest peak amplitude. In one embodiment, the receiver comprises a plurality of antennas that may each receive one of a plurality of RF signals conforming to the IEEE 802.11b standard. The receiver may have multiple antennas for use with the IEEE 802.11n standard, but may receive signals conforming to the 802.11b standard. The receiver also comprises a carrier sense circuit configured to calculate a signal metric for each of the signals and further configured to generate a selection signal signifying one of the signals, based on the signal metric. The receiver further comprises a multiplexer configured to output one of the signals, based on the selection signal.

摘要翻译： 具有数字天线切换的无线网络接收机基于诸如最高信号质量或最高峰值幅度的信号度量来选择具有802.11b信号的天线。 在一个实施例中，接收机包括可以各自接收符合IEEE 802.11b标准的多个RF信号中的一个的多个天线。 接收机可以具有用于IEEE 802.11n标准的多个天线，但是可以接收符合802.11b标准的信号。 接收机还包括被配置为计算每个信号的信号度量的载波侦听电路，并进一步被配置为基于信号度量产生表示信号之一的选择信号。 接收机还包括多路复用器，配置为基于选择信号输出信号之一。