公开(公告)号：WO2010132475A8

公开(公告)日：2011-06-16

申请号：PCT/US2010034416

申请日：2010-05-11

Applicant: QUALCOMM INC ,  GORE DHANANJAY ASHOK ,  BARRIAC GWENDOLYN DENISE ,  HOWARD STEVEN J

Inventor： GORE DHANANJAY ASHOK ,  BARRIAC GWENDOLYN DENISE ,  HOWARD STEVEN J

IPC: H04L25/02 ,  H04B7/155

CPC classification number: H04L25/022 ,  H04B7/15585 ,  H04L25/0226

Abstract: A method for estimating a feedback channel for a wireless repeater uses frequency domain channel estimation and uses a signal indicative of the amplified signal as a pilot signal. The channel estimation method generates a time domain feedback channel estimate from the frequency domain channel estimation and scales the time domain feedback channel estimate using scaling factors. In one embodiment, the scaling factors are function of a tap index and the block size of the frequency domain channel estimation.

Abstract translation: 用于估计无线中继器的反馈信道的方法使用频域信道估计，并且使用表示放大的信号的信号作为导频信号。 信道估计方法从频域信道估计生成时域反馈信道估计，并使用缩放因子来缩放时域反馈信道估计。 在一个实施例中，缩放因子是抽头索引和频域信道估计的块大小的函数。

公开(公告)号：WO2010132446A3

公开(公告)日：2011-03-17

申请号：PCT/US2010034384

申请日：2010-05-11

Applicant: QUALCOMM INC ,  HOWARD STEVEN J ,  JAROSINSKI TADEUSZ ,  GORE DHANANJAY ASHOK ,  BARRIAC GWENDOLYN DENISE ,  WANG MICHAEL MAO ,  TIAN TAO

Inventor： HOWARD STEVEN J ,  JAROSINSKI TADEUSZ ,  GORE DHANANJAY ASHOK ,  BARRIAC GWENDOLYN DENISE ,  WANG MICHAEL MAO ,  TIAN TAO

IPC: H04B7/155 ,  H04B17/40 ,  H04L27/26

CPC classification number: H04B7/15535 ,  H04B7/15585 ,  H04L27/2607 ,  H04L27/2613

Abstract: A wireless repeater includes a channel estimation block to estimate a feedback channel between the antennas of the repeater using frequency domain channel estimation. The repeater includes a pilot signal blanking circuit to blank out a selected number of samples of the pilot signal to improve the accuracy of the channel estimation. In another embodiment, the repeater replaces T samples of the pilot signal with a cyclic prefix.

Abstract translation: 无线中继器包括信道估计块，用于使用频域信道估计来估计中继器的天线之间的反馈信道。 中继器包括导频信号消隐电路，用于消除导频信号的选定数目的样本，以提高信道估计的精度。 在另一个实施例中，中继器用循环前缀替换导频信号的T个样本。

公开(公告)号：WO2008083399A3

公开(公告)日：2008-09-12

申请号：PCT/US2008050011

申请日：2008-01-02

Applicant: QUALCOMM INC ,  BJERKE BJORN ,  HOWARD STEVEN J

Inventor： BJERKE BJORN ,  HOWARD STEVEN J

IPC: H04L25/02

CPC classification number: H04L25/0212 ,  H04L27/2647

Abstract: Disclosed herein are methods and apparatus for enhancing the estimation of channel response in a wireless communication system. An apparatus (and associated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver adapted to receive a signal from the receiving antenna; an initial channel estimator module adapted to select a selected channel from among one or more channels in the communication system and to determine, for the selected channel, an initial channel estimate based upon the received signal; a transformation module adapted to transform the initial channel estimate into an initial impulse response estimate comprising a sequence of samples; a filtering module adapted to select a sub-sequence of samples from the sequence of samples and generate a truncated initial impulse response estimate by setting to zero the samples in the initial impulse response estimate that are not in the selected sub-sequence of samples; and a maximum likelihood channel estimating module adapted to compute a time domain weighted impulse response estimate using the truncated time domain impulse response estimate for the selected channel and to compute a maximum likelihood channel estimate for the selected channel by transforming the time domain weighted impulse response estimate into the frequency domain.

Abstract translation: 这里公开了用于增强无线通信系统中的信道响应的估计的方法和装置。 一种用于在通信系统中优化信道估计的装置（及相关方法）包括接收天线; 接收器，适于从所述接收天线接收信号; 初始信道估计器模块，其适于从所述通信系统中的一个或多个信道中选择所选择的信道，并且针对所选择的信道，基于接收到的信号来确定初始信道估计; 转换模块，其适于将所述初始信道估计转换为包括样本序列的初始脉冲响应估计; 滤波模块，其适于从样本序列中选择样本的子序列，并通过将不在所选择的样本子序列中的初始脉冲响应估计中的样本设置为零来产生截短的初始脉冲响应估计; 以及最大似然信道估计模块，其适于使用所选择的信道的截断的时域脉冲响应估计来计算时域加权的脉冲响应估计，并且通过变换所述时域加权的脉冲响应估计来计算所选择的信道的最大似然信道估计 进入频域。

公开(公告)号：WO2006053341A3

公开(公告)日：2008-07-17

申请号：PCT/US2005041784

申请日：2005-11-15

Applicant: QUALCOMM INC ,  HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

Inventor： HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: G06F17/16 ,  H04J99/00 ,  H04B7/04 ,  H04L25/02

CPC classification number: G06F17/16 ,  H04B7/0413 ,  H04B7/0617 ,  H04L25/0208 ,  H04L25/0248 ,  H04L27/2647

Abstract: For eigenvalue decomposition, a first set of at least one variable is derived based on a first matrix being decomposed and using Coordinate Rotational Digital Computer (CORDIC) computation. A second set of at least one variable is derived based on the first matrix and using a look-up table. A second matrix of eigenvectors of the first matrix is then derived based on the first and second variable sets. To derive the first variable set, CORDIC computation is performed on an element of the first matrix to determine the magnitude and phase of this element, and CORDIC computation is performed on the phase to determine the sine and cosine of this element. To derive the second variable set, intermediate quantities are derived based on the first matrix and used to access the look-up table. Jacobi rotations are performed using CORDIC processing.

Abstract translation: 对于特征值分解，基于正在分解的第一矩阵并使用坐标旋转数字计算机（CORDIC）计算来导出至少一个变量的第一组。 基于第一矩阵并使用查找表导出第二组至少一个变量。 然后基于第一和第二变量集导出第一矩阵的特征向量的第二矩阵。 为了导出第一变量集，对第一矩阵的元素执行CORDIC计算，以确定该元素的幅度和相位，并且在相位上执行CORDIC计算以确定该元素的正弦和余弦。 为了导出第二变量集，基于第一矩阵导出中间量并用于访问查找表。 使用CORDIC处理执行Jacobi旋转。

公开(公告)号：WO2008083399A2

公开(公告)日：2008-07-10

申请号：PCT/US2008/050011

申请日：2008-01-02

Applicant: QUALCOMM Incorporated ,  BJERKE, Bjorn ,  HOWARD, Steven J.

Inventor： BJERKE, Bjorn ,  HOWARD, Steven J.

IPC: H04L25/02

CPC classification number: H04L25/0212 ,  H04L27/2647

Abstract: Disclosed herein are methods and apparatus for enhancing the estimation of channel response in a wireless communication system. An apparatus (and associated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver adapted to receive a signal from the receiving antenna; an initial channel estimator module adapted to select a selected channel from among one or more channels in the communication system and to determine, for the selected channel, an initial channel estimate based upon the received signal; a transformation module adapted to transform the initial channel estimate into an initial impulse response estimate comprising a sequence of samples; a filtering module adapted to select a sub-sequence of samples from the sequence of samples and generate a truncated initial impulse response estimate by setting to zero the samples in the initial impulse response estimate that are not in the selected sub-sequence of samples; and a maximum likelihood channel estimating module adapted to compute a time domain weighted impulse response estimate using the truncated time domain impulse response estimate for the selected channel and to compute a maximum likelihood channel estimate for the selected channel by transforming the time domain weighted impulse response estimate into the frequency domain.

Abstract translation: 这里公开了用于增强无线通信系统中的信道响应的估计的方法和装置。 一种用于在通信系统中优化信道估计的装置（及相关方法）包括接收天线; 接收器，适于从所述接收天线接收信号; 初始信道估计器模块，其适于从所述通信系统中的一个或多个信道中选择所选择的信道，并且针对所选择的信道，基于接收到的信号来确定初始信道估计; 转换模块，其适于将所述初始信道估计转换为包括样本序列的初始脉冲响应估计; 滤波模块，其适于从样本序列中选择样本的子序列，并通过将不在所选择的样本子序列中的初始脉冲响应估计中的样本设置为零来产生截短的初始脉冲响应估计; 以及最大似然信道估计模块，其适于使用所选择的信道的截断的时域脉冲响应估计来计算时域加权的脉冲响应估计，并且通过变换所述时域加权的脉冲响应估计来计算所选择的信道的最大似然信道估计 进入频域。

公开(公告)号：WO2007137281A3

公开(公告)日：2007-11-29

申请号：PCT/US2007/069501

申请日：2007-05-22

Applicant: QUALCOMM Incorporated ,  WALTON, J. Rodney ,  WALLACE, Mark S. ,  MEDVEDEV, Irina ,  HOWARD, Steven, J.

Inventor： WALTON, J. Rodney ,  WALLACE, Mark S. ,  MEDVEDEV, Irina ,  HOWARD, Steven, J.

IPC: H04L27/26 ,  H04L27/00

Abstract: Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

公开(公告)号：WO2006053340A2

公开(公告)日：2006-05-18

申请号：PCT/US2005/041783

申请日：2005-11-15

Applicant: QUALCOMM INCORPORATED ,  KETCHUM, John W. ,  WALTON, J. Rodney ,  WALLACE, Mark S. ,  HOWARD, Steven J. ,  INANOGLU, Hakan

Inventor： KETCHUM, John W. ,  WALTON, J. Rodney ,  WALLACE, Mark S. ,  HOWARD, Steven J. ,  INANOGLU, Hakan

IPC: G06F17/16

CPC classification number: H04L25/0248 ,  G06F17/16

Abstract: Techniques for decomposing matrices using Jacobi rotation are described. Multiple iterations of Jacobi rotation are performed on a first matrix of complex values with multiple Jacobi rotation matrices of complex values to zero out the off-diagonal elements in the first matrix. For each iteration, a submatrix may be formed based on the first matrix and decomposed to obtain eigenvectors for the submatrix, and a Jacobi rotation matrix may be formed with the eigenvectors and used to update the first matrix. A second matrix of complex values, which contains orthogonal vectors, is derived based on the Jacobi rotation matrices. For eigenvalue decomposition, a third matrix of eigenvalues may be derived based on the Jacobi rotation matrices. For singular value decomposition, a fourth matrix with left singular vectors and a matrix of singular values may be derived based on the Jacobi rotation matrices.

Abstract translation: 描述了使用雅可比旋转分解矩阵的技术。 对具有复数值的多个Jacobi旋转矩阵的复数值的第一矩阵执行Jacobi旋转的多次迭代，以将第一矩阵中的非对角线元素归零。 对于每个迭代，可以基于第一矩阵形成子矩阵并且被分解以获得子矩阵的特征向量，并且可以与特征向量形成雅可比旋转矩阵并用于更新第一矩阵。 基于Jacobi旋转矩阵导出包含正交向量的第二个复数值矩阵。 对于特征值分解，可以基于Jacobi旋转矩阵导出特征值的第三矩阵。 对于奇异值分解，可以基于雅可比旋转矩阵导出具有左奇异矢量的第四矩阵和奇异值矩阵。

公开(公告)号：WO2005114868A1

公开(公告)日：2005-12-01

申请号：PCT/US2005/015042

申请日：2005-04-29

Applicant: QUALCOMM INCORPORATED ,  HOWARD, Steven, J. ,  WALTON, Jay, Rodney ,  WALLACE, Mark, S.

Inventor： HOWARD, Steven, J. ,  WALTON, Jay, Rodney ,  WALLACE, Mark, S.

IPC: H04B7/06

CPC classification number: H04B7/0617 ,  H04B7/0408 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0671

Abstract: A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.

Abstract translation: 发送实体对具有本征模式矩阵，导向矩阵或单位矩阵的每个子带的数据符号执行空间处理，以获得子带的空间处理符号。 数据符号可以在具有本征模式矩阵的正交空间信道上，在具有导引矩阵的不同空间信道上，或者从具有单位矩阵的不同发射天线发送。 在从多个发射天线的发射之前，发射实体在频域或时域中进一步对空间处理的符号执行波束成形。 接收实体执行补充处理以恢复由发送实体发送的数据符号。 接收实体可以基于该子带的MIMO信道响应矩阵为每个子带导出空间滤波器矩阵，并且利用空间滤波器矩阵对子带执行接收机空间处理。

公开(公告)号：WO2010132478A3

公开(公告)日：2011-04-07

申请号：PCT/US2010034419

申请日：2010-05-11

Applicant: QUALCOMM INC ,  BARRIAC GWENDOLYN DENISE ,  HOWARD STEVEN J ,  GORE DHANANJAY ASHOK

Inventor： BARRIAC GWENDOLYN DENISE ,  HOWARD STEVEN J ,  GORE DHANANJAY ASHOK

IPC: H04L25/02

CPC classification number: H04L25/0226 ,  H04B7/15585 ,  H04L25/022 ,  H04L25/0242

Abstract: A method for estimating a feedback channel for a wireless repeater using frequency domain channel estimation estimates an error correction term using a most recent channel estimate and cancels the error correction term from a current block of the receive signal. Then, the feedback channel is estimated using frequency domain channel estimation and using a current block of the pilot signal and the corrected block of the receive signal. A channel estimate error term may also be estimated and subtracted directly from the channel estimate.

Abstract translation: 使用频域信道估计来估计无线中继器的反馈信道的方法使用最新的信道估计来估计误差校正项，并从接收信号的当前块中消除纠错项。 然后，使用频域信道估计并使用导频信号的当前块和接收信号的校正块来估计反馈信道。 也可以从信道估计直接估计和减去信道估计误差项。

公开(公告)号：WO2010132461A1

公开(公告)日：2010-11-18

申请号：PCT/US2010/034400

申请日：2010-05-11

Applicant: QUALCOMM INCORPORATED ,  GORE, Dhananjay Ashok ,  BARRIAC, Gwendolyn Denise ,  HOWARD, Steven J. ,  PROCTOR, James Arthur, Jr. ,  GAINEY, Kenneth M.

Inventor： GORE, Dhananjay Ashok ,  BARRIAC, Gwendolyn Denise ,  HOWARD, Steven J. ,  PROCTOR, James Arthur, Jr. ,  GAINEY, Kenneth M.

IPC: H04B7/155

CPC classification number: H04B7/15535 ,  H04B7/15585 ,  H04L27/2607 ,  H04L27/2613

Abstract: A wireless repeater includes an echo canceller to cancel an estimated feedback amount from an input signal and a delay to delay the input signal. The delay may be selected to decorrelate a remote signal from a signal to be transmitted by the repeater.

Abstract translation: 无线中继器包括回波消除器，以从输入信号中消除估计的反馈量，延迟延迟输入信号。 可以选择该延迟以从要由中继器发送的信号去除相关的远程信号。