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：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：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。

公开(公告)号：WO2007143472A2

公开(公告)日：2007-12-13

申请号：PCT/US2007/069967

申请日：2007-05-30

Applicant: QUALCOMM INCORPORATED ,  SURINENI, Shravan K. ,  WALTON, J. Rodney ,  WALLACE, Mark ,  HOWARD, Steven J.

Inventor： SURINENI, Shravan K. ,  WALTON, J. Rodney ,  WALLACE, Mark ,  HOWARD, Steven J.

CPC classification number: H04B7/0636 ,  H04B7/0417 ,  H04B7/0634 ,  H04L1/1671

Abstract: Techniques for quickly sending feedback information for beamforming are described. A transmitter/initiator sends a first frame comprising training symbols. A receiver/responder receives the first frame, determines the amount of time to generate feedback information, and determines the amount of time to send the feedback information. The receiver then determines the length of a second frame carrying the feedback information based on the amounts of time to generate and send the feedback information. The receiver sends the second frame after waiting a short interframe space (SIFS) period from the end of the first frame, without performing channel access. The receiver generates the feedback information based on the training symbols and sends the information in the second frame when ready. The transmitter receives the second frame, derives at least one steering matrix based on the feedback information, and sends a third frame with the at least one steering matrix.

Abstract translation: 描述了用于快速发送用于波束成形的反馈信息的技术。 发射机/发起者发送包括训练符号的第一帧。 接收器/响应器接收第一帧，确定产生反馈信息的时间量，并确定发送反馈信息的时间量。 然后，接收机基于生成和发送反馈信息的时间量确定承载反馈信息的第二帧的长度。 在等待来自第一帧结束的短帧间间隔（SIFS）周期之后，接收机发送第二帧，而不执行信道接入。 接收机根据训练符号生成反馈信息，并在准备就绪时发送第二帧中的信息。 所述发射机接收所述第二帧，基于所述反馈信息导出至少一个导引矩阵，并且发送具有所述至少一个导引矩阵的第三帧。

公开(公告)号：WO2006019711A1

公开(公告)日：2006-02-23

申请号：PCT/US2005/024615

申请日：2005-07-11

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: H04B7/0413 ,  H04B7/0417 ,  H04B7/0421 ,  H04B7/0617 ,  H04L1/0026

Abstract: A "unified" MIMO system that supports multiple operating modes for efficient data transmission is described. Each operating mode is associated with different spatial processing at a transmitting entity. For example, four operating modes may be defined for (1) full-CSI or partial-CSI transmission and (2) with or without steering transmit diversity (STD). An appropriate operating mode may be selected for use based on various factors (e.g., availability of a good channel estimate). With steering transmit diversity, data is spatially spread and transmitted on multiple spatial channels, and a single rate may then be used for all spatial channels used for data transmission. A receiving entity may utilize a minimum mean square error (MMSE) technique for all operating modes. The receiving entity may derive a spatial filter matrix and perform receiver spatial processing in the same manner for all operating modes, albeit with different effective channel response matrices.

Abstract translation: 描述了支持多种操作模式以实现有效数据传输的“统一”MIMO系统。 每个操作模式与发送实体处的不同空间处理相关联。 例如，可以为（1）全CSI或部分CSI传输定义四种操作模式，以及（2）具有或不具有导向发射分集（STD）的操作模式。 可以基于各种因素（例如，良好信道估计的可用性）来选择适当的操作模式来使用。 利用转向发射分集，数据在空间上扩展并在多个空间信道上传输，然后可以将单个速率用于用于数据传输的所有空间信道。 接收实体可以对所有操作模式使用最小均方误差（MMSE）技术。 接收实体可以导出空间滤波器矩阵并且以相同的方式对所有操作模式执行接收机空间处理，尽管具有不同的有效信道响应矩阵。

公开(公告)号：WO2010132446A2

公开(公告)日：2010-11-18

申请号：PCT/US2010/034384

申请日：2010-05-11

Applicant: QUALCOMM Incorporated ,  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

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：WO2007127744A1

公开(公告)日：2007-11-08

申请号：PCT/US2007/067323

申请日：2007-04-24

Applicant: QUALCOMM INCORPORATED ,  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: H04B7/06 ,  H04L27/26 ,  H04B7/04

CPC classification number: H04B7/0421 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/066 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

Abstract: Techniques for transmitting data using channel information for a subset of all subcarriers used for data transmission are described. A transmitter station (110) receives channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission. The channel information may include at least one transmit steering matrix, at least one set of eigenvectors, at least one channel response matrix, at least one channel covariance matrix, an unsteered pilot, or a steered pilot for the at least one subcarrier. The transmitter station obtains at least one transmit steering matrix for the at least one subcarrier from the channel information and determines a transmit steering matrix for each of the multiple subcarriers. The transmitter station performs transmit steering or beam-steering for each of the multiple subcarriers with the transmit steering matrix for that subcarrier.

Abstract translation: 描述了使用用于数据传输的所有子载波的子集的信道信息来发送数据的技术。 发射机站（110）接收作为用于数据传输的多个子载波的子集的至少一个子载波的信道信息。 信道信息可以包括至少一个发射导向矩阵，至少一组特征向量，至少一个信道响应矩阵，至少一个信道协方差矩阵，非导向导频或用于所述至少一个子载波的导频导频。 发射机站从信道信息中获取至少一个子载波的至少一个发射导向矩阵，并确定多个子载波中的每一个的发射导向矩阵。 发射台使用该子载波的发射导向矩阵对多个子载波中的每一个进行发射导向或波束导向。

公开(公告)号：WO2005081483A1

公开(公告)日：2005-09-01

申请号：PCT/US2005/005262

申请日：2005-02-18

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

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

IPC: H04L25/03

CPC classification number: H04B7/0421 ,  H04B17/20 ,  H04B17/21 ,  H04L25/03343 ,  H04L2025/03375 ,  H04L2025/03802

Abstract: The downlink and uplink are calibrated to account for differences in the responses of transmit and receive chains at an access point and a user terminal. For initial calibration, the access point and user terminal transmit MIMO pilots on the downlink and uplink, which are used to derive channel estimates including the responses of the applicable transmit/receive chains. Correction matrices (a) and (b) are derived based on these channel estimates and thereafter used by the access point and user terminal, respectively. For follow-on calibration, one entity transmits a MIMO pilot and a steered reference. The other entity derives a first transmit matrix based on the steered reference and a second transmit matrix based on the MIMO pilot and calibration error matrices (c) and (d), which contain estimates of the errors in (a) and (b), respectively. (c) and (d) may be iteratively adjusted based on an adaptive procedure to minimize the errors between the two transmit matrices.

Abstract translation: 校准下行链路和上行链路以考虑在接入点和用户终端处的发射和接收链的响应的差异。 对于初始校准，接入点和用户终端在下行链路和上行链路上传输MIMO导频，用于导出包括适用发射/接收链的响应的信道估计。 基于这些信道估计导出校正矩阵（a）和（b），然后分别由接入点和用户终端使用。 对于后续校准，一个实体发送MIMO导频和转向引用。 另一实体基于导向参考导出第一发射矩阵，并且基于包含（a）和（b）中的误差的估计的基于MIMO导频和校准误差矩阵（c）和（d））的第二发射矩阵， 分别。 （c）和（d）可以基于自适应过程进行迭代调整，以最小化两个发射矩阵之间的误差。

公开(公告)号：EP1695477B1

公开(公告)日：2011-10-26

申请号：EP04814424.0

申请日：2004-12-15

Applicant: Qualcomm, Incorporated

Inventor： WALTON, Jay Rodney ,  ZHENG, Lizhong ,  KETCHUM, John W. ,  WALLACE, Mark S. ,  HOWARD, Steven J.

IPC: H04L1/06

CPC classification number: H04B7/0417 ,  H04B7/0456 ,  H04B7/0669 ,  H04B17/336 ,  H04L1/06

Abstract: Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in NM transmission spans, where ND≧1 and NM>1. The ND blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.

公开(公告)号：EP2122950A2

公开(公告)日：2009-11-25

申请号：EP08727343.9

申请日：2008-01-02

Applicant: QUALCOMM Incorporated

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.