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公开(公告)号：US08909174B2
公开(公告)日：2014-12-09
申请号：US12533765
申请日：2009-07-31
CPC分类号： H04B7/0617 , H04B7/0408 , H04B7/0417 , H04B7/0626 , H04B7/0671
摘要： 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.
摘要翻译： 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，并且对于具有空间滤波器矩阵的子带执行接收机空间处理。
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公开(公告)号：US08711763B2
公开(公告)日：2014-04-29
申请号：US13353924
申请日：2012-01-19
CPC分类号： H04W74/0833 , H04B7/0413 , H04B7/043 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0866 , H04W88/06
摘要： Techniques for facilitating random access in wireless multiple-access communication systems are described. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. Other aspects, embodiments, and features are also claimed and described.
摘要翻译： 描述了用于促进无线多址通信系统中的随机接入的技术。 随机接入信道（RACH）被定义为包括“快速”RACH（F-RACH）和“慢”RACH（S-RACH）。 F-RACH和S-RACH可以有效地支持不同操作状态的用户终端，并采用不同的设计。 F-RACH可以用于快速访问系统，而S-RACH更加强大，可以支持各种操作状态和条件下的用户终端。 F-RACH可以由已经向系统注册的用户终端使用，并且可以通过适当地提前发送定时来补偿它们的往返延迟（RTD）。 S-RACH可以由可能已经或可能没有在系统中注册的用户终端使用，并且可以或可能不能够补偿它们的RTD。 还要求和描述其它方面，实施例和特征。
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公开(公告)号：US20120114019A1
公开(公告)日：2012-05-10
申请号：US13277456
申请日：2011-10-20
申请人： Mark S. Wallace , Jay Rodney Walton
发明人： Mark S. Wallace , Jay Rodney Walton
CPC分类号： H04L27/0014 , H04L27/2613 , H04L27/2656 , H04L27/2657 , H04L27/2675 , H04L27/2676 , H04W74/02 , H04W84/12 , H04W88/04
摘要： Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequency error for subsequent packet transmissions received from the transmitting station. The residual frequency error is small after correcting for the frequency error and allows the receiving station to perform coherent accumulation/integration over a longer time interval to detect for a packet transmission. The longer coherent accumulation interval improves detection performance, especially at low SNRs for extended transmission range. The techniques may be used whenever the receiving station knows the identity of the transmitting station, e.g., if the subsequent packet transmissions are scheduled. Other aspects, features, and embodiments are also claimed and described.
摘要翻译： 描述了在WLAN中扩展传输范围的技术。 在一方面，接收站基于一个或多个初始分组传输来确定发射站和接收站之间的频率误差，并且校正该频率误差以用于从发射台接收的后续分组传输。 在校正频率误差之后，剩余频率误差较小，并且允许接收站在更长的时间间隔上执行相干累积/积分以检测分组传输。 较长的相干累加间隔提高了检测性能，特别是在扩展传输范围的低SNR时。 每当接收站知道发射台的身份时，例如如果后续分组传输被调度，则可以使用这些技术。 还要求和描述其它方面，特征和实施例。
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公开(公告)号：US08036710B2
公开(公告)日：2011-10-11
申请号：US11047917
申请日：2005-01-31
CPC分类号： H04W52/029 , H04W52/0274 , Y02D70/00
摘要： A power-efficient wireless device is equipped with multiple (N) antennas. Each antenna is associated with a transmitter unit and a receiver unit. The wireless device also has processing units used to perform various digital processing tasks. The transmitter units, receiver units, and processing units may be selectively enabled or disabled. In an idle state, the wireless device may enable only a subset (e.g., one) of the N receiver units and one or few processing units for signal detection and acquisition. For active communication, the wireless device may enable Ntx transmitter units for data transmission and/or Nrx receiver units for data reception, where 1≦Ntx≦N and 1≦Nrx≦N. The enabled processing units may also be clocked at a lower frequency whenever data is transmitted or received at a data rate lower than the highest data rate. The wireless device may go to sleep whenever possible to conserve power.
摘要翻译： 功率高效的无线设备配备有多（N）个天线。 每个天线与发射机单元和接收机单元相关联。 无线设备还具有用于执行各种数字处理任务的处理单元。 可以选择性地启用或禁用发射机单元，接收机单元和处理单元。 在空闲状态下，无线设备可以仅使得N个接收机单元中的子集（例如，一个）和用于信号检测和获取的一个或几个处理单元。 对于主动通信，无线设备可以使Ntx发射机单元用于数据传输和/或Nrx接收机单元用于数据接收，其中1＆nlE; Ntx＆nlE; N和1＆nlE; Nrx＆nlE; N。 每当以低于最高数据速率的数据速率发送或接收数据时，启用的处理单元也可以以更低的频率被计时。 无线设备可能会尽可能地睡眠以节省电力。
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公开(公告)号：US07995616B2
公开(公告)日：2011-08-09
申请号：US12022975
申请日：2008-01-30
IPC分类号： H04J13/00
CPC分类号： H04L27/2679 , H04L7/042 , H04L7/08 , H04L27/2655 , H04L27/2676
摘要： A method for identifying a reference point in time in a wireless communication system includes: receiving a first repeated sequence of symbols; receiving a second repeated sequence of symbols; performing an autocorrelation between the first and second sequences of symbols; and identifying as the reference point in time an autocorrelation null between the first and second repeated sequences of symbols. Apparatus for identifying a reference point in time in a wireless communication system includes: means for receiving a first repeated sequence of symbols; means for receiving a second repeated sequence of symbols; means for performing an autocorrelation between the first and second sequences of symbols; and means for identifying as the reference point in time an autocorrelation null between the first and second repeated sequences of symbols.
摘要翻译： 一种用于在无线通信系统中识别参考时间点的方法包括：接收第一重复符号序列; 接收第二重复符号序列; 执行所述第一和第二符号序列之间的自相关; 并且将第一和第二重复符号序列之间的自相关空值识别为时间上的参考点。 用于在无线通信系统中识别参考点的装置包括：用于接收第一重复符号序列的装置; 用于接收第二重复符号序列的装置; 用于执行所述第一和第二符号序列之间的自相关的装置; 以及用于将所述第一和第二重复符号序列之间的自相关零点识别为所述参考点的装置。
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6.发明授权Eigenvalue decomposition and singular value decomposition of matrices using Jacobi rotation 有权使用Jacobi旋转的矩阵的特征值分解和奇异值分解公开(公告)号：US07895254B2
公开(公告)日：2011-02-22
申请号：US11280596
申请日：2005-11-15
IPC分类号： G06F7/32
CPC分类号： G06F17/16 , H04L25/0208 , H04L25/0246 , H04L25/0248
摘要： 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.
摘要翻译： 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。 对于每次迭代，可以基于第一矩阵形成子矩阵并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。
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7.发明申请EFFICIENT COMPUTATION FOR EIGENVALUE DECOMPOSITION AND SINGULAR VALUE DECOMPOSITION OF MATRICES 审中-公开特征值分解和矩阵的单值分解的有效计算公开(公告)号：US20100169396A1
公开(公告)日：2010-07-01
申请号：US12720017
申请日：2010-03-09
CPC分类号： G06F17/16 , H04B7/0413 , H04B7/0617 , H04L25/0208 , H04L25/0248 , H04L27/2647
摘要： 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.
摘要翻译： 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。
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8.发明授权公开(公告)号：US07711762B2
公开(公告)日：2010-05-04
申请号：US11096839
申请日：2005-03-31
IPC分类号： G06F17/16
CPC分类号： G06F17/16 , H04B7/0413 , H04B7/0617 , H04L25/0208 , H04L25/0248 , H04L27/2647
摘要： 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.
摘要翻译： 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。
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9.发明授权Broadcast transmission with spatial spreading in a multi-antenna communication system 有权在多天线通信系统中具有空间扩展的广播传输公开(公告)号：US07302009B2
公开(公告)日：2007-11-27
申请号：US11009824
申请日：2004-12-09
IPC分类号： H04B7/02
CPC分类号： H04L25/03866 , H04B7/043 , H04B7/0615 , H04B7/0669 , H04B7/0678 , H04B7/068 , H04B7/12 , H04L5/0007 , H04L25/0204 , H04L25/0224 , H04W52/42
摘要： An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an “effective” channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain ND data symbol blocks to be broadcast in NM transmission spans, where ND≧1 and NM>1. The ND data symbol 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) 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 broadcast via NT transmit antennas and in one transmission span to user terminals within a broadcast coverage area.
摘要翻译： 多天线系统中的接入点使用空间扩展广播数据，以随机化由接入点广播的每个数据符号块由每个用户终端观察到的“有效”信道。 在接入点，对数据进行编码，交织和调制，以获得要在N N个传输跨度中广播的N个D个数据符号块，其中N < / SUB >> = 1和N＆lt; 1＆gt; 1。 N N个数据符号块被划分为N个M个数据符号子块，每个传输跨度的一个子块。 对于每个子块，选择导向矩阵（例如，从一组L个导引矩阵中以确定性或伪随机方式）。 利用为该子块选择的导引矩阵来对每个数据符号子块进行空间处理，以获得进一步处理并通过N T T个发射天线广播的传输符号，并且在一个传输范围内广播覆盖范围内的用户终端 区。
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公开(公告)号：US08547820B2
公开(公告)日：2013-10-01
申请号：US12504395
申请日：2009-07-16
申请人： Jay Rodney Walton , Mark S. Wallace
发明人： Jay Rodney Walton , Mark S. Wallace
IPC分类号： H04L27/28
CPC分类号： H04B7/0413 , H04L1/0001 , H04L1/06 , H04L25/0204 , H04L25/0226 , H04L27/261
摘要： A transmitting entity transmits a “base” pilot in each protocol data unit (PDU). A receiving entity is able to derive a sufficiently accurate channel response estimate of a MIMO channel with the base pilot under nominal (or most) channel conditions. The transmitting entity selectively transmits an additional pilot if and as needed, e.g., based on channel conditions and/or other factors. The additional pilot may be adaptively inserted in almost any symbol period in the PDU. The receiving entity is able to derive an improved channel response estimate with the additional pilot. The transmitting entity sends signaling to indicate that additional pilot is being sent. This signaling may be embedded within pilot symbols sent on a set of pilot subbands used for a carrier pilot that is transmitted across most of the PDU. The signaling indicates whether additional pilot is being sent and possibly other pertinent information.
摘要翻译： 发送实体在每个协议数据单元（PDU）中发送“基本”导频。 接收实体能够在标称（或大多数）信道条件下导出具有基本导频的MIMO信道的足够准确的信道响应估计。 如果并根据需要，例如基于信道条件和/或其他因素，发送实体选择性地发送附加导频。 可以在PDU中的几乎任何符号周期中自适应地插入附加导频。 接收实体能够使用附加导频来导出改进的信道响应估计。 发送实体发送信令以指示正在发送附加飞行员。 该信令可以嵌入在用于在大多数PDU上发送的用于载波导频的一组导频子带上发送的导频符号中。 信令指示是否发送附加飞行员以及可能的其他相关信息。
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