公开(公告)号：US08238466B2

公开(公告)日：2012-08-07

申请号：US12788081

申请日：2010-05-26

Applicant: Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Kedar Shirali ,  Rohit U. Nabar ,  Atul Salhotra

Inventor： Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Kedar Shirali ,  Rohit U. Nabar ,  Atul Salhotra

IPC: H04B7/02 ,  H04B1/40 ,  H04L23/02

CPC classification number: H04B7/0678 ,  H04L1/06

Abstract: 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.

Abstract translation: 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：US08199841B1

公开(公告)日：2012-06-12

申请号：US12111129

申请日：2008-04-28

Applicant: Konstantinos Sarrigeorgidis ,  Kedar Shirali

Inventor： Konstantinos Sarrigeorgidis ,  Kedar Shirali

IPC: H04B7/02

CPC classification number: H04L25/03891 ,  H04B7/0413 ,  H04L1/004 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0625 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0242 ,  H04L25/0244 ,  H04L27/2601 ,  H04L2025/03414 ,  H04L2025/03636 ,  H04L2025/03649

Abstract: An equalizer to be applied to signals received via at least one multiple input, multiple output (MIMO) channel is computed using a matrix equalizer computational device. The computed equalizer is applied to a received signal to recover an equalized representation of encoded data sent in a transmission. Errors are removed from the equalized representation of the encoded data to generate an error-corrected estimation of the encoded data sent in the transmission, and the equalized representation of the encoded data is compared to the error-corrected estimation of the encoded data. An updated equalizer is then computed to be applied to a subsequent signal based on the comparison.

Abstract translation: 通过使用矩阵均衡器计算装置来计算应用于经由至少一个多输入多输出（MIMO）信道接收的信号的均衡器。 将所计算的均衡器应用于接收信号以恢复在传输中发送的编码数据的均衡表示。 从编码数据的均衡表示中删除错误，以产生在传输中发送的编码数据的纠错估计，并将编码数据的均衡表示与编码数据的纠错估计进行比较。 然后根据该比较，计算更新的均衡器以将其应用于后续信号。

公开(公告)号：US08149863B1

公开(公告)日：2012-04-03

申请号：US11351936

申请日：2006-02-09

Applicant: Atul Sahotra ,  Kedar Shirali

Inventor： Atul Sahotra ,  Kedar Shirali

IPC: H04L12/413

CPC classification number: H04W74/0816 ,  H04L1/0034 ,  H04L12/413 ,  H04L47/135 ,  H04W74/0825

Abstract: A method is provided for controlling access to a wireless communications medium. The method includes: sampling RF activity on the medium; autocorrelating samples to produce a first value indicative of autocorrelation computed with a first delay substantially matching periodicity of a signal of interest and to produce a second value indicative of autocorrelation computed with a second delay different from the first delay; monitoring the first value to determine whether the first value is possibly indicative of the signal of interest; monitoring the second value to determine whether the second value is indicative of an interferer signal; and preventing transmission of an RF transmit signal on the medium in response to the first value indicating that activity on the medium includes the signal of interest when the second value indicates that activity on the medium does not include an interferer signal.

Abstract translation: 提供了一种用于控制对无线通信介质的访问的方法。 该方法包括：对介质上的RF活动进行采样; 自相关采样以产生指示基本上匹配感兴趣信号的周期性的第一延迟计算的自相关的第一值，并产生指示以与第一延迟不同的第二延迟计算的自相关的第二值; 监测第一值以确定第一值是否可能指示感兴趣的信号; 监视所述第二值以确定所述第二值是否指示干扰信号; 以及当所述第二值指示所述介质上的活动不包括干扰信号时，响应于指示所述介质上的活动包括所述感兴趣的信号的所述第一值，防止所述介质上的RF发射信号的传输。

公开(公告)号：US07978781B2

公开(公告)日：2011-07-12

申请号：US12785234

申请日：2010-05-21

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

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

IPC: H04B7/02 ,  H04B1/40 ,  H04L23/02

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

Abstract: A first packet is transmitted via a forward channel corresponding to a signal direction from a first transceiver device to a second transceiver device, wherein the first packet includes a request to initiate calibration. A partial dimensional description of a reverse channel is determined based on the reception of a second packet received from the second transceiver device, wherein the second packet includes training information of spatial dimensions used for the transmission of the second packet but does not include training information for all available spatial dimensions of a reverse channel. A correction matrix is developed from the partial dimensional description of the reverse channel and a description of the forward channel, and the correction matrix and a steering matrix is used to process signals to be transmitted via the forward channel.

Abstract translation: 第一分组经由与从第一收发器设备到第二收发器设备的信号方向对应的前向信道发送，其中第一分组包括启动校准的请求。 基于从第二收发器设备接收到的第二分组的接收来确定反向信道的部分维度描述，其中第二分组包括用于传输第二分组的空间维度的训练信息，但不包括用于 反向通道的所有可用空间维度。 从反向信道的部分维度描述和正向信道的描述开发校正矩阵，并且使用校正矩阵和导引矩阵来处理要经由前向信道发送的信号。

公开(公告)号：US07535974B1

公开(公告)日：2009-05-19

申请号：US12148765

申请日：2008-04-22

Applicant: Kedar Shirali

Inventor： Kedar Shirali

IPC: H04L25/03

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H03F1/3282 ,  H03F3/24 ,  H03F2200/207 ,  H03F2201/3203

Abstract: A system configured to linearize a response of a nonlinear amplifier comprises a buffer to store a plurality of samples of an input signal to be amplified by the nonlinear amplifier. A self-receiver generates samples of an output signal of the nonlinear amplifier. A synchronization unit matches each sample of the output signal to a corresponding sample of the input signal stored in the buffer. A predistortion correction circuit generates a distortion correction function to be applied to the input signal to linearize the response of the nonlinear amplifier. The distortion correction function is generated based on a comparison of each matched sample of the output signal and corresponding sample of the input signal.

Abstract translation: 被配置为线性化非线性放大器的响应的系统包括用于存储要由非线性放大器放大的输入信号的多个采样的缓冲器。 自我接收器产生非线性放大器的输出信号的采样。 同步单元将输出信号的每个样本与存储在缓冲器中的输入信号的对应样本相匹配。 预失真校正电路产生应用于输入信号的失真校正功能，以线性化非线性放大器的响应。 基于输出信号的每个匹配样本和输入信号的相应样本的比较来生成失真校正功能。

公开(公告)号：US07209522B1

公开(公告)日：2007-04-24

申请号：US10388940

申请日：2003-03-14

Applicant: Kedar Shirali

Inventor： Kedar Shirali

IPC: H04B15/00

CPC classification number: H04L1/0631 ,  H04L1/0656

Abstract: A technique for generating a demodulation ordering used in receive signal processing operations in a BLAST MIMO receiver that is based on a relative comparison of near-to-far resistance measures among vectors forming the estimated channel transfer function matrix is disclosed. This near-to-far resistance comparison provides a resulting demodulation ordering believed equivalent to that provided by conventional V-BLAST techniques without requiring computation of the pseudoinverse of the estimated channel matrix. Also disclosed is a successive interference cancellation technique which employs Multi-Staged Nested Weiner Filtering (MSNWF) to recover soft estimates of the transmitted component-symbols from the vector observed at the BLAST MIMO receiver. Employing such MSNWF estimation is believed advantageous in that it avoids the need for matrix inversion operations involving the estimated channel matrix, Covariance Level Order Recursive-MSNWF (MSNWF-COR) or MSNWF Conjugate Gradient techniques may be conveniently implemented to provide the desired MSNWF estimation.

Abstract translation: 公开了一种用于在BLAST MIMO接收机中的接收信号处理操作中使用的解调顺序的技术，其基于形成估计的信道传递函数矩阵的向量中的近距离电阻测量的相对比较。 这种近距离电阻比较提供了相当于传统V-BLAST技术提供的解调顺序，而不需要计算估计的信道矩阵的伪逆。 还公开了一种连续的干扰消除技术，其采用多阶段嵌套的韦恩滤波（MSNWF）来从在BLAST MIMO接收机观测到的向量中恢复发射的分量符号的软估计。 认为使用这样的MSNWF估计是有利的，因为它避免了涉及估计信道矩阵的矩阵求逆运算的需要，可以方便地实现协方差级顺序递归-MSNWF（MSNWF-COR）或MSNWF共轭梯度技术来提供所需的MSNWF估计。