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

IPC分类号： H04B7/02 ,  H04L23/02

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.

公开(公告)号：US20080031372A1

公开(公告)日：2008-02-07

申请号：US11870380

申请日：2007-10-10

申请人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Steven Howard

发明人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Steven Howard

IPC分类号： H04L27/28

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，以获得发射符号，其进一步经由N T T个发射天线处理和广播，并且在一个传输跨度内广播覆盖范围内的用户终端 区。

公开(公告)号：US20060274638A1

公开(公告)日：2006-12-07

申请号：US11494126

申请日：2006-07-26

申请人： Jay Walton ,  John Ketchum ,  Steven Howard ,  Mark Wallace

发明人： Jay Walton ,  John Ketchum ,  Steven Howard ,  Mark Wallace

IPC分类号： H04J11/00

CPC分类号： H04W52/12 ,  H04B1/692 ,  H04L5/0021 ,  H04L5/0048 ,  H04L5/026 ,  H04L25/0228 ,  H04L27/0008 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2647 ,  H04L27/2655 ,  H04W52/286

摘要： In one aspect of a multiple-access OFDM-CDMA system, the data spreading is performed in the frequency domain by spreading each data stream with a respective spreading code selected from a set of available spreading codes. To support multiple access, system resources may be allocated and de-allocated to users (e.g., spreading codes may be assigned to users as needed, and transmit power may be allocated to users). Variable rate data for each user may be supported via a combination of spreading adjustment and transmit power scaling. Interference control techniques are also provided to improve system performance via power control of the downlink and/or uplink transmissions to achieve the desired level of performance while minimizing interference. A pilot may be transmitted by each transmitter unit to assist the receiver units perform acquisition, timing synchronization, carrier recovery, handoff, channel estimation, coherent data demodulation, and so on.

公开(公告)号：US20060187815A1

公开(公告)日：2006-08-24

申请号：US11042921

申请日：2005-01-24

申请人： Mark Wallace ,  John Ketchum

发明人： Mark Wallace ,  John Ketchum

IPC分类号： H04J11/00

CPC分类号： H04L1/0069 ,  H04L1/0041 ,  H04L1/0059

摘要： Techniques to parse data into multiple (M) streams with selectable data rates are described. The modulation scheme and code rate for each stream are determined based on the data rate selected for that stream. The modulation schemes and code rates for all M streams are used to determine a parse cycle and the number of puncture cycles for each stream in the parse cycle. A sequence of puncture cycles is formed for the M streams such that the puncture cycle(s) for each stream are distributed as evenly as possible across the sequence. An encoder encodes traffic data in accordance with a base code (e.g., a rate 1/2 binary convolutional code) and generates code bits. A parser then parses the code bits into the M streams based on the sequence of puncture cycles, one puncture cycle at a time and in the order indicated by the sequence.

摘要翻译： 描述了以可选择的数据速率将数据解析成多个（M）流的技术。 基于为该流选择的数据速率来确定每个流的调制方案和码率。 所有M个流的调制方案和码率用于确定分析周期中每个流的解析周期和穿孔次数。 形成针对M个流的穿刺周期的序列，使得每个流的穿刺循环在整个序列上尽可能均匀地分布。 编码器根据基本码（例如，速率1​​/2二进制卷积码）编码业务数据，并生成码位。 解析器然后基于穿刺周期的序列，一次一次的穿刺周期和按序列表示的顺序将代码位解析成M个流。

公开(公告)号：US20060155798A1

公开(公告)日：2006-07-13

申请号：US11280596

申请日：2005-11-15

申请人： John Ketchum ,  Jay Walton ,  Mark Wallace ,  Steven Howard ,  Hakan Inanoglu

发明人： John Ketchum ,  Jay Walton ,  Mark Wallace ,  Steven Howard ,  Hakan Inanoglu

IPC分类号： G06F7/52

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：US20060039312A1

公开(公告)日：2006-02-23

申请号：US11248890

申请日：2005-10-11

申请人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Irina Medvedev

发明人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Irina Medvedev

IPC分类号： H04B7/204

CPC分类号： H04L5/0023 ,  H04L1/06 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0058 ,  H04L5/006

摘要： Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency “signatures” of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlink) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics). One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.

公开(公告)号：US20050265281A1

公开(公告)日：2005-12-01

申请号：US11197497

申请日：2005-08-03

申请人： John Ketchum

发明人： John Ketchum

IPC分类号： H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L27/26 ,  H04Q7/00

CPC分类号： H04B7/0417 ,  H04B7/0443 ,  H04B7/0613 ,  H04B7/0626 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0046 ,  H04L5/006 ,  H04W52/34

摘要： In a MIMO communication system (100) with limited power for each antenna, a method, apparatus and a processor (420) provide for determining bin energy level allocation to each OFDM frequency bin at each transmit antenna. An estimate of a solution vector including elements of the allocation bin energy level to each OFDM frequency bin at each antenna is determined. An error function based on the determined solution vector is also determined. An error magnitude is determined based on the determined error function. The error magnitude is compared to an error threshold. The processor (420) accepts the estimate of the solution vector with the elements of the allocation bin energy level when the error magnitude is less than the error threshold.

摘要翻译： 在每个天线具有有限功率的MIMO通信系统（100）中，方法，装置和处理器（420）提供用于确定在每个发射天线处对每个OFDM频率仓的二进制能级分配。 确定包括每个天线处的每个OFDM频率仓的分配箱能级的元素的解矢量的估计。 还确定了基于确定的解向量的误差函数。 基于确定的误差函数确定误差大小。 将误差幅度与误差阈值进行比较。 当误差幅度小于误差阈值时，处理器（420）接收具有分配箱能级的元素的解矢量的估计。

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

IPC分类号： H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B17/00 ,  H04L25/03 ,  H04L1/02 ,  H04B7/02

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。