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公开(公告)号：US20080002794A1
公开(公告)日：2008-01-03
申请号：US11750471
申请日：2007-05-18
申请人： Mark Wallace , John Ketchum , J. Walton , Steven Howard
发明人： Mark Wallace , John Ketchum , J. Walton , Steven Howard
IPC分类号： H04B1/10
CPC分类号： H04W52/42 , H04L27/2613 , H04L27/2659 , H04L27/266 , H04W52/286
摘要： Techniques for performing acquisition of packets are described. First detection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing multiply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to obtain average power values. Whether a packet is presence may be determined based on the average detection values and the average power values. Second detection values may be determined based on a second plurality of samples. The start of the packet may be determined based on the first and second detection values. A third detection value may be determined based on a third plurality of samples. Frequency error of the packet may be estimated based on the first and third detection values.
摘要翻译： 描述用于执行分组获取的技术。 可以基于第一多个样本来确定第一检测值，例如通过对样本执行延迟乘法积分。 功率值可以基于第一多个样本来确定，例如通过对样本进行乘法积分。 可以对第一检测值进行平均以获得平均检测值。 功率值也可以被平均以获得平均功率值。 可以基于平均检测值和平均功率值来确定分组是否存在。 可以基于第二多个样本来确定第二检测值。 分组的开始可以基于第一和第二检测值来确定。 可以基于第三多个样本来确定第三检测值。 可以基于第一和第三检测值来估计分组的频率误差。
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2.发明申请Frequency-independent spatial processing for wideband MISO and MIMO systems 有权用于宽带MISO和MIMO系统的频率独立空间处理公开(公告)号：US20060274844A1
公开(公告)日：2006-12-07
申请号：US11471415
申请日：2006-06-19
申请人： J. Walton , John Ketchum , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , Mark Wallace , Steven Howard
IPC分类号： H04K1/10
CPC分类号： H04L1/0002 , H04B7/0417 , H04B7/0617 , H04L25/0206 , H04L25/0212 , H04L25/0242 , H04L27/2647
摘要： Frequency-independent eigensteering in MISO and MIMO systems are described. For principal mode and multi-mode eigensteering, a correlation matrix is computed for a MIMO channel based on channel response matrices and decomposed to obtain NS frequency-independent steering vectors for NS spatial channels of the MIMO channel. ND data symbol streams are transmitted on ND best spatial channels using ND steering vectors, where ND=1 for principal mode eigensteering and ND>1 for multi-mode eigensteering. For main path eigensteering, a data symbol stream is transmitted on the best spatial channel for the main propagation path (e.g., with the highest energy) of the MIMO channel. For receiver eigensteering, a data symbol stream is steered toward a receive antenna based on a steering vector obtained for that receive antenna. For all eigensteering schemes, a matched filter is derived for each receive antenna based on the steering vector(s) and channel response vectors for the receive antenna.
摘要翻译： 描述MISO和MIMO系统中与频率无关的本征导向。 对于主模式和多模式特征向导，基于信道响应矩阵针对MIMO信道计算相关矩阵，并且对其进行分解，以获得N S S / N N的非频率无关导向向量 > MIMO信道的空间信道。 N N个数据符号流使用N D D个导向矢量在N N D个最佳空间信道上发送，其中N N D = 1用于主模式本征转向，N
1 > 1用于多模特征转向。 对于主路径特征导向，在用于主要传播路径（例如，具有最高能量）的MIMO信道的最佳空间信道上发送数据符号流。 对于接收机本征导向，基于为该接收天线获得的导向向量，将数据符号流转向接收天线。 对于所有特征导向方案，基于接收天线的导向矢量和信道响应向量，为每个接收天线导出匹配滤波器。 -
公开(公告)号：US20050237920A1
公开(公告)日：2005-10-27
申请号：US10830907
申请日：2004-04-22
申请人： Steven Howard , John Ketchum , Mark Wallace , Peter Monsen , J. Walton
发明人： Steven Howard , John Ketchum , Mark Wallace , Peter Monsen , J. Walton
CPC分类号： H04B7/0615 , H04B7/0413
摘要： A matrix {circumflex over (V)} of eigenvectors is derived using an iterative procedure. For the procedure, an eigenmode matrix Vi is first initialized, e.g., to an identity matrix. The eigenmode matrix Vi is then updated based on a channel response matrix {circumflex over (H)} for a MIMO channel to obtain an updated eigenmode matrix Vi+1. The eigenmode matrix may be updated for a fixed or variable number of iterations. The columns of the updated eigenmode matrix may be orthogonalized periodically to improve performance and ensure stability of the iterative procedure. In one embodiment, after completion of all iterations, the updated eigenmode matrix for the last iteration is provided as the matrix {circumflex over (V)}.
摘要翻译： 使用迭代过程导出特征向量的矩阵{circumflex over（ V）}。 对于该过程，本征模式矩阵 V I i首先被初始化，例如，到单位矩阵。 然后，基于MIMO信道的信道响应矩阵（对于（ H）}来更新本征模式矩阵 V 更新的本征模式矩阵 V i + 1 。 可以针对固定或可变数量的迭代更新本征模式矩阵。 更新的本征模式矩阵的列可以周期性地正交化以提高性能并确保迭代过程的稳定性。 在一个实施例中，在完成所有迭代之后，用于最后迭代的更新的本征模式矩阵被提供为矩阵{circumflex over（ V）}。
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公开(公告)号：US20070086536A1
公开(公告)日：2007-04-19
申请号：US11610351
申请日：2006-12-13
申请人： John Ketchum , Mark Wallace , J. Walton , Steven Howard
发明人： John Ketchum , Mark Wallace , J. Walton , Steven Howard
IPC分类号： H04K1/10
CPC分类号： H04L27/261 , H04B7/0413 , H04B7/0421 , H04B7/0615 , H04B7/0619 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0003 , H04L1/0009 , H04L1/0017 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/2647 , H04W16/28 , H04W52/50
摘要： Channel estimation and spatial processing for a TDD MIMO system. Calibration may be performed to account for differences in the responses of transmit/receive chains at the access point and user terminal. During normal operation, a MIMO pilot is transmitted on a first link and used to derive an estimate of the first link channel response, which is decomposed to obtain a diagonal matrix of singular values and a first unitary matrix containing both left eigenvectors of the first link and right eigenvectors of a second link. A steered reference is transmitted on the second link using the eigenvectors in the first unitary matrix, and is processed to obtain the diagonal matrix and a second unitary matrix containing both left eigenvectors of the second link and right eigenvectors of the first link. Each unitary matrix may be used to perform spatial processing for data transmission/reception via both links.
摘要翻译： TDD MIMO系统的信道估计和空间处理。 可以执行校准以解决在接入点和用户终端处的发送/接收链的响应的差异。 在正常操作期间，在第一链路上发送MIMO导频，并用于导出第一链路信道响应的估计，其被分解以获得奇异值的对角矩阵，以及包含第一链路的左特征向量的第一酉矩阵 和第二个链接的右特征向量。 使用第一单位矩阵中的特征向量在第二链路上传送转向参考，并且被处理以获得对角矩阵和包含第二链路的左特征向量和第一链路的右特征向量的第二单元矩阵。 每个单一矩阵可以用于经由两个链路进行数据发送/接收的空间处理。
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公开(公告)号：US20050111599A1
公开(公告)日：2005-05-26
申请号：US10719802
申请日：2003-11-21
申请人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
CPC分类号： H04B7/043 , H04B1/71072 , H04B7/0408 , H04B7/0413 , H04B7/0421 , H04B7/0617 , H04B7/0619 , H04B7/0697 , H04B17/309 , H04L5/023 , H04W16/28
摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.
摘要翻译： 获得每个终端的上行链路信道响应矩阵，并对其进行分解，得到终端在上行链路上使用的导向矢量。 基于其导向向量及其信道响应矩阵，为每个终端形成“有效”上行链路信道响应向量。 基于其有效信道响应向量来评估多组终端，以确定用于上行链路传输的最佳集合（例如具有最高总吞吐量）。 每个选择的终端利用其导向向量对其数据符号流执行空间处理，并将其空间处理的数据符号流发送到接入点。 多个选择的终端通过其相应的MIMO信道同时将其数据符号流发送到接入点。 接入点根据接收机空间处理技术对其接收到的符号流执行接收机空间处理，以恢复由所选终端发送的数据符号流。
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6.发明申请Frequency-independent spatial processing for wideband MISO and MIMO systems 有权用于宽带MISO和MIMO系统的频率独立空间处理公开(公告)号：US20050047515A1
公开(公告)日：2005-03-03
申请号：US10650295
申请日：2003-08-27
申请人： J. Walton , John Ketchum , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , Mark Wallace , Steven Howard
CPC分类号： H04L1/0002 , H04B7/0417 , H04B7/0617 , H04L25/0206 , H04L25/0212 , H04L25/0242 , H04L27/2647
摘要： Frequency-independent eigensteering in MISO and MIMO systems are described. For principal mode and multi-mode eigensteering, a correlation matrix is computed for a MIMO channel based on channel response matrices and decomposed to obtain NS frequency-independent steering vectors for NS spatial channels of the MIMO channel. ND data symbol streams are transmitted on ND best spatial channels using ND steering vectors, where ND=1 for principal mode eigensteering and ND>1 for multi-mode eigensteering. For main path eigensteering, a data symbol stream is transmitted on the best spatial channel for the main propagation path (e.g., with the highest energy) of the MIMO channel. For receiver eigensteering, a data symbol stream is steered toward a receive antenna based on a steering vector obtained for that receive antenna. For all eigensteering schemes, a matched filter is derived for each receive antenna based on the steering vector(s) and channel response vectors for the receive antenna.
摘要翻译： 描述MISO和MIMO系统中与频率无关的本征导向。 对于主模式和多模式特征向导，基于信道响应矩阵为MIMO信道计算相关矩阵，并对其进行分解，以获得用于MIMO信道的NS空间信道的NS频率无关导向向量。 ND数据符号流使用ND导向矢量在ND最佳空间信道上传输，其中主模式特征导向的ND = 1，多模式特征转向的ND> 1。 对于主路径特征导向，在用于主要传播路径（例如，具有最高能量）的MIMO信道的最佳空间信道上发送数据符号流。 对于接收机本征导向，基于为该接收天线获得的导向向量，将数据符号流转向接收天线。 对于所有特征导向方案，基于接收天线的导向矢量和信道响应向量，为每个接收天线导出匹配滤波器。
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公开(公告)号：US20080037681A1
公开(公告)日：2008-02-14
申请号：US11869596
申请日：2007-10-09
申请人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
CPC分类号： H04B7/043 , H04B1/71072 , H04B7/0408 , H04B7/0413 , H04B7/0421 , H04B7/0617 , H04B7/0619 , H04B7/0697 , H04B17/309 , H04L5/023 , H04W16/28
摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.
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8.发明申请Calibration of downlink and uplink channel responses in a wireless MIMO communication system 有权无线MIMO通信系统中下行链路和上行链路信道响应的校准公开(公告)号：US20050185728A1
公开(公告)日：2005-08-25
申请号：US10783175
申请日：2004-02-19
申请人： Mark Wallace , John Ketchum , J. Walton , Steven Howard
发明人： Mark Wallace , John Ketchum , J. Walton , Steven Howard
CPC分类号： H04B7/0421 , H04B17/20 , H04B17/21 , H04L25/03343 , H04L2025/03375 , H04L2025/03802
摘要： 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 {circumflex over (K)}ap and {circumflex over (K)}ut 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 Qap and Qut, which contain estimates of the errors in {circumflex over (K)}ap and {circumflex over (K)}ut, respectively. Qap and Qut may be iteratively adjusted based on an adaptive procedure to minimize the errors between the two transmit matrices.
摘要翻译： 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 K 和 K ，然后由访问 点和用户终端。 对于后续校准，一个实体发送MIMO导频和转向引用。 另一实体基于导向基准导出第一发射矩阵，并且基于MIMO导频和校准误差矩阵 < SINGLE“> Q ，其分别包含K 和 K 中的错误的估计。 可以基于自适应过程来迭代地调整 Q 以最小化 两个传输矩阵。
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9.发明申请Method and apparatus for providing an efficient control channel structure in a wireless communication system 有权一种用于在无线通信系统中提供有效的控制信道结构的方法和装置公开(公告)号：US20050120097A1
公开(公告)日：2005-06-02
申请号：US10725904
申请日：2003-12-01
申请人： J. Walton , John Ketchum
发明人： J. Walton , John Ketchum
IPC分类号： H04B7/06 , H04B7/26 , H04L1/00 , H04L1/06 , H04L1/16 , H04L12/28 , H04L12/56 , H04L25/02 , H04L27/26 , H04W28/18 , H04W36/00 , H04W72/14 , G06F15/177 , H04B7/216 , H04J1/00 , H04J3/00
CPC分类号： H04L1/06 , H04B7/2643 , H04L1/0002 , H04L1/0025 , H04L1/16 , H04L25/0204 , H04L27/261 , H04L2001/0093 , H04W24/02 , H04W28/18 , H04W72/0406 , H04W72/14 , H04W84/12
摘要： According to one aspect of the invention, a method is provided in which a control channel used for transmitting control information is partitioned into a plurality of subchannels each of which is operated at a specific data rate. For each of one or more user terminals, one of the subchannels is selected based on one or more selection criteria for transmitting control information from an access point to the respective user terminal. Control information is transmitted from the access point to a user terminal on a particular subchannel selected for the respective user terminal. At the user terminal, one or more subchannels are decoded to obtain control information designated for the user terminal.
摘要翻译： 根据本发明的一个方面，提供一种方法，其中用于发送控制信息的控制信道被划分为多个子信道，每个子信道以特定数据速率操作。 对于一个或多个用户终端中的每一个，基于用于将控制信息从接入点发送到相应用户终端的一个或多个选择标准来选择子信道之一。 控制信息从接入点发送到为各个用户终端选择的特定子信道上的用户终端。 在用户终端，对一个或多个子信道进行解码，以获得为用户终端指定的控制信息。
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10.发明申请公开(公告)号：US20050078762A1
公开(公告)日：2005-04-14
申请号：US10682160
申请日：2003-10-08
申请人： John Ketchum , Mark Wallace , J. Walton , Steven Howard
发明人： John Ketchum , Mark Wallace , J. Walton , Steven Howard
CPC分类号： H04B7/0417 , H04B7/0854 , H04L1/0002 , H04L1/0003 , H04L1/0009 , H04L1/06 , H04L25/0206 , H04L27/2601
摘要： For eigenmode transmission with minimum mean square error (MMSE) receiver spatial processing, a transmitter performs spatial processing on NS data symbol streams with steering vectors to transmit the streams on NS spatial channels of a MIMO channel. The steering vectors are estimates of transmitter steering vectors required to orthogonalize the spatial channels. A receiver derives a spatial filter based on an MMSE criterion and with an estimate of the MIMO channel response and the steering vectors. The receiver (1) obtains NR received symbol streams from NR receive antennas, (2) performs spatial processing on the received symbol streams with the spatial filter to obtain NS filtered symbol streams, (3) performs signal scaling on the filtered symbol streams with a scaling matrix to obtain NS recovered symbol streams, and (4) processes the NS recovered symbol streams to obtain NS decoded data streams for the NS data streams sent by the transmitter.
摘要翻译： 对于具有最小均方误差（MMSE）接收机空间处理的本征模式传输，发射机对具有导航向量的NS数据符号流执行空间处理，以在MIMO信道的NS空间信道上发送流。 导向矢量是使空间通道正交化所需的发射机导向矢量的估计。 接收机基于MMSE准则和MIMO信道响应和导向向量的估计导出空间滤波器。 接收机（1）从NR个接收天线获得NR个接收到的符号流，（2）利用空间滤波器对接收到的符号流进行空间处理，以获得NS滤波的符号流，（3）用滤波符号流执行信号缩放， 缩放矩阵以获得NS恢复的符号流，以及（4）处理NS恢复的符号流，以获得由发送器发送的NS数据流的NS解码数据流。
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