公开(公告)号：US08213368B2

公开(公告)日：2012-07-03

申请号：US11777671

申请日：2007-07-13

申请人： Dennis Hui ,  Leonid Krasny

发明人： Dennis Hui ,  Leonid Krasny

IPC分类号： H04W4/00

CPC分类号： H04L1/0026 ,  H04L1/0019 ,  H04L1/0029 ,  H04L1/003

摘要： A method of variable rate vector quantization reduces the amount of channel state feedback. Channel coefficients of a communication channel are determined and second order statistics (e.g., variances) of the channel taps are computed). Bit allocation for the channel taps are determined based on the coefficients statistics. The channel taps are individually quantized at rates determined based on said bit allocations.

摘要翻译： 可变速率矢量量化的方法减少了信道状态反馈的量。 确定通信信道的信道系数，并且计算信道抽头的二阶统计（例如，方差）。 基于系数统计确定信道抽头的位分配。 以基于所述位分配确定的速率单独地量化信道抽头。

公开(公告)号：US08170131B2

公开(公告)日：2012-05-01

申请号：US12281963

申请日：2006-03-07

申请人： Jiann-Ching Guey ,  Leonid Krasny

发明人： Jiann-Ching Guey ,  Leonid Krasny

IPC分类号： H04B7/02

CPC分类号： H04L1/0693 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0615 ,  H04L25/0206 ,  H04L25/0248

摘要： The present invention relates to a method and arrangement for reducing feedback data in a communication system, said communication system comprising a number of transmitter antennas, nτ, and a number of receiver antennas, nR, for parallel spatially independent transmission and reception of signals, wherein a channel response is represented by a matrix (G) containing nR×nτ complex variables. The method comprises the steps of: decomposing an expression of said channel response matrix (G) into products of a unitary transform (V), nR×nT diagonal matrix (Λ) and a conjugate transpose of a unitary matrix (W). Choosing said unitary matrix (W) such that its diagonal elements are real, substituting said channel response matrix (G) with a representative subset of elements in said decomposed expression of said channel response matrix (G), said representative subset comprising diagonal of a first matrix (Λ) and lower triangle of a second matrix (W) excluding the diagonal.

摘要翻译： 本发明涉及用于减少通信系统中的反馈数据的方法和装置，所述通信系统包括多个发射机天线nτ和多个用于并行的空间独立的信号发射和接收的接收天线nR，其中 信道响应由包含nR×nτ个复数变量的矩阵（G）表示。 该方法包括以下步骤：将所述信道响应矩阵（G）的表达式分解为单一变换（V），nR×nT对角矩阵（Λ）和酉矩阵（W）的共轭转置的乘积。 用所述信道响应矩阵（G）的所述分解表达式中的元素的代表性子集替换所述信道响应矩阵（G），选择所述酉矩阵（W）使其对角元素是实数，所述代表子集包括第一 矩阵（Λ）和除对角线之外的第二矩阵（W）的下三角形。

公开(公告)号：US20110280287A1

公开(公告)日：2011-11-17

申请号：US12779106

申请日：2010-05-13

申请人： Jung-Fu Cheng ,  Dennis Hui ,  Kambiz Zangi ,  Leonid Krasny

发明人： Jung-Fu Cheng ,  Dennis Hui ,  Kambiz Zangi ,  Leonid Krasny

IPC分类号： H04B1/38 ,  H04B7/02

CPC分类号： H04W72/0413 ,  H04L1/0019 ,  H04L1/0028 ,  H04L1/20 ,  H04W72/042

摘要： The required bitrate for reporting channel state information from a network transceiver to the network is dramatically reduced, while maintaining fidelity of channel estimates, by exploiting prior channel estimates and the time correlation of channel response. For a selected set of sub-carriers, the transceiver estimates channel frequency response from pilot signals. The transceiver also predicts the frequency response for each selected sub-carrier, by multiplying a state vector comprising prior frequency response estimate and a coefficient vector comprising linear predictive coefficients. The predicted frequency response is subtracted from the estimated frequency response, and the prediction error is quantized and transmitted to the network. The network maintains a corresponding state vector and predictive coefficient vector, and also predicts a frequency response for each selected sub-carrier. The received prediction error is inverse quantized and subtracted from the predicted frequency response to yield a frequency response corresponding to that estimated at the transceiver.

摘要翻译： 通过利用先前的信道估计和信道响应的时间相关性，可以显着降低从网络收发器向网络报告信道状态信息所需的比特率，同时保持信道估计的保真度。 对于所选择的一组子载波，收发器估计来自导频信号的信道频率响应。 收发器还通过将包括先前频率响应估计的状态向量和包括线性预测系数的系数向量相乘来预测每个所选子载波的频率响应。 从估计的频率响应中减去预测的频率响应，并将预测误差量化并发送到网络。 网络维持相应的状态向量和预测系数向量，并且还预测每个选择的子载波的频率响应。 接收的预测误差被反量化，并从预测的频率响应中减去，以产生与在收发机处估计的频率响应相对应的频率响应。

公开(公告)号：US20100234053A1

公开(公告)日：2010-09-16

申请号：US12404773

申请日：2009-03-16

申请人： Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

发明人： Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC分类号： H04B7/005 ,  H04B15/00

CPC分类号： H04B7/024

摘要： A method for determining antenna weights for use in transmitting data from a plurality of base stations to a user device is disclosed. The antenna weights are determined using an input covariance matrix (S), and the input covariance matrix is determined subject to a predetermined power constraint and a predetermined, non-zero interference constraint.

摘要翻译： 公开了一种用于确定用于从多个基站向用户设备发送数据的天线权重的方法。 使用输入协方差矩阵（S）确定天线权重，并且在预定功率约束和预定的非零干扰约束条件下确定输入协方差矩阵。

公开(公告)号：US07623596B2

公开(公告)日：2009-11-24

申请号：US10608274

申请日：2003-06-27

申请人： Leonid Krasny ,  Dennis Hui

发明人： Leonid Krasny ,  Dennis Hui

IPC分类号： H04L27/06

CPC分类号： H04L25/0212 ,  H04L25/0226 ,  H04L25/0248

摘要： A channel response may be estimated from training symbols that are received over a channel, by determining an initial channel estimate from the training symbols and applying bias to the initial channel estimate to obtain a biased channel estimate. The biased channel estimate may then be used to demodulate a signal that is received over the channel.

摘要翻译： 可以通过从训练符号确定初始信道估计并将偏差应用于初始信道估计以获得偏置信道估计，从​​通过信道接收的训练符号估计信道响应。 然后可以使用偏置信道估计来解调通过信道接收的信号。

公开(公告)号：US07313110B2

公开(公告)日：2007-12-25

申请号：US10267223

申请日：2002-10-09

申请人： Jiann-Ching Guey ,  Leonid Krasny

发明人： Jiann-Ching Guey ,  Leonid Krasny

IPC分类号： H04Q7/00 ,  H04J3/16

CPC分类号： H04W28/22 ,  H04W72/0413

摘要： Bandwidth is allocated in a radio packet data system by sending achievable data rate estimate information from an access terminal to an access network. The achievable data rate estimate information is associated with scenarios corresponding to state combinations of a plurality of transmitters in the access network in which each transmitter is in either a serving, active, or idle state and one or more of the plurality of transmitters is in the idle state in one or more of the scenarios.

摘要翻译： 通过将可实现的数据速率估计信息从接入终端发送到接入网络，在无线分组数据系统中分配带宽。 可实现的数据速率估计信息与在接入网络中的多个发射机的状态组合相对应的情况相关联，其中每个发射机处于服务，主动或空闲状态，并且多个发射机中的一个或多个处于 一个或多个情景中的空闲状态。

公开(公告)号：US07197282B2

公开(公告)日：2007-03-27

申请号：US10135095

申请日：2002-04-30

申请人： Paul W. Dent ,  Kambiz C. Zangi ,  Leonid Krasny

发明人： Paul W. Dent ,  Kambiz C. Zangi ,  Leonid Krasny

IPC分类号： H04B17/00

CPC分类号： H04L27/367 ,  H04B1/7105 ,  H04B7/005 ,  H04B7/022 ,  H04B7/0615 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0636 ,  H04L1/0003 ,  H04L1/16 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0244 ,  H04L25/03343

摘要： Processing of loop-back information returned by one or more mobile stations that are served by a wireless communication network permits the network to compensate its transmit signals for increased transmission efficiency and reduced signal interference at the mobile stations. Generally, the network forms one or more transmit signals as a combination of different signals intended for the different mobile stations, and remembers transmit information associated with these transmit signals. The mobile stations return loop-back signals to the network, which determines transmit signal compensation information by comparing loop-back information to memorized information. The mobile stations may loop-back samples from composite received signals, from processed received signal samples, or loop-back estimates. In the first case, processing at the network involves compensating the combined transmit signals at the transmit modulation rate, while the second case involves symbol rate processing of the individual information streams intended for the different mobile stations.

摘要翻译： 由无线通信网络服务的一个或多个移动站返回的环回信息的处理允许网络补偿其发射信号，以增加传输效率并降低移动站处的信号干扰。 通常，网络形成作为不同移动站的不同信号的组合的一个或多个发射信号，并且记住发送与这些发射信号相关联的信息。 移动站向网络返回环回信号，通过将回送信息与存储信息进行比较来确定发送信号补偿信息。 移动台可以从复合接收信号，经过处理的接收信号样本或环回估计中回送样本。 在第一种情况下，网络处理涉及以发射调制速率补偿组合的发射信号，而第二种情况涉及针对不同移动台的各个信息流的符号速率处理。

公开(公告)号：US20060072485A1

公开(公告)日：2006-04-06

申请号：US10943274

申请日：2004-09-17

申请人： Douglas Cairns ,  Leonid Krasny

发明人： Douglas Cairns ,  Leonid Krasny

IPC分类号： H04B3/20

CPC分类号： H04L25/03006

摘要： A frequency domain representation of a whitening filter is made to depend on essentially one unknown, namely, a scaling factor that is based on an estimated ratio of total base station power to the power spectral density (PSD) of inter-cell interference plus noise. In turn, that scaling factor can be computed based on the modeling terms used in a parametric model of the impairment correlations for a received communication signal. Preferably, the model comprises an interference impairment term scaled by a first model fitting parameter, and a noise impairment term scaled by a second model fitting parameter. Further, the scaling factor can be computed by directly estimating total base station transmit power and the PSD of inter-cell interference plus noise. In any case, the whitening filter can be used in whitening a received communication signal in conjunction with channel equalization processing or RAKE receiver processing, for example.

摘要翻译： 使白化滤波器的频域表示依赖于基本上一个未知数，即基于总基站功率与小区间干扰加上噪声的功率谱密度（PSD）的估计比的缩放因子。 反过来，可以基于在接收到的通信信号的损害相关性的参数模型中使用的建模项来计算该缩放因子。 优选地，该模型包括由第一模型拟合参数缩放的干扰损害项和由第二模型拟合参数缩放的噪声损伤项。 此外，可以通过直接估计总基站发射功率和小区间干扰加上噪声的PSD来计算缩放因子。 在任何情况下，例如，白化滤波器可用于结合信道均衡处理或RAKE接收机处理来使接收到的通信信号变白。

公开(公告)号：US06680969B1

公开(公告)日：2004-01-20

申请号：US09373289

申请日：1999-08-12

申请人： Karl James Molnar ,  Leonid Krasny ,  Hüseyin Arslan

发明人： Karl James Molnar ,  Leonid Krasny ,  Hüseyin Arslan

IPC分类号： H04L2706

CPC分类号： H04B1/707 ,  H04B7/01 ,  H04B2201/70701

摘要： A Doppler spread for a communications channel is measured by providing an estimate of the communications channel and generating an autocorrelation function for the estimate of the communications channel. One of a plurality of autocorrelation function hypotheses is selected to approximate the autocorrelation function for the estimate of the communications channel wherein each of the autocorrelation function hypotheses corresponds to a respective Doppler spread estimate hypothesis. One of the Doppler spread estimate hypotheses is selected corresponding to the selected autocorrelation function hypotheses as an estimate of the Doppler spread for the communications channel.

摘要翻译： 通过提供通信信道的估计并且生成用于通信信道的估计的自相关函数来测量通信信道的多普勒扩展。 选择多个自相关函数假设之一来近似用于估计通信信道的自相关函数，其中每个自相关函数假设对应于相应的多普勒扩展估计假设。 选择对应于所选择的自相关函数假设的多普勒扩展估计假设之一作为通信信道的多普勒扩展的估计。

公开(公告)号：US08432993B2

公开(公告)日：2013-04-30

申请号：US12810360

申请日：2007-12-27

申请人： Kambiz Zangi ,  Leonid Krasny

发明人： Kambiz Zangi ,  Leonid Krasny

IPC分类号： H04B7/02

CPC分类号： H04B7/0413 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0244 ,  H04L27/2647

摘要： An apparatus for estimating a channel response associated with a multiple input/multiple output (MIMO) system includes an antenna that receives multiple pilot symbols, each of the multiple pilot symbols transmitted from a different one of multiple transmit antennas of a transmitter in the MIMO system. The apparatus further includes a channel estimator that determines spatial, time and frequency correlations of channels of the MIMO system among the multiple transmit antennas when estimating a channel response associated with the MIMO system based on multiple ones of the received plurality of pilot symbols.

摘要翻译： 用于估计与多输入/多输出（MIMO）系统相关联的信道响应的装置包括：天线，其接收多个导频符号，所述多个导频符号中的每一个从MIMO系统中的发射机的多个发射天线中的不同发射天线发送 。 该装置还包括信道估计器，其基于接收到的多个导频符号中的多个导频符号估计与MIMO系统相关联的信道响应，确定MIMO系统在多个发射天线中的信道的空间，时间和频率相关性。