公开(公告)号：US06563925B1

公开(公告)日：2003-05-13

申请号：US09287102

申请日：1999-04-07

申请人： Leonid Krasny

发明人： Leonid Krasny

IPC分类号： H04M908

CPC分类号： H04M9/082

摘要： Echo is canceled in a communication device including at least one microphone and a loudspeaker. Signals directed to the loudspeaker are filtered through at least one first filter. The filtered signals are subtracted from signals received by the microphone. At least one second filter filters the subtracted results to produce a signal corresponding to speech signals received by the microphone. At least one third filter filters the subtracted results to produce a signal corresponding to echo from the loudspeaker. The output from the third filter is subtracted from the output from the second filter to produce an echo-canceled signal. The device may include a number of microphones, and the first, second, and third filters may each include a number of filters equal to the number of microphones. The outputs from the second filter may be added, the outputs from the third filter may be added, and the sum of the outputs from the third filter may be subtracted from the sum of the outputs of the second filter. The output from the third filter may be weighted before being subtracted from output of the second filter.

摘要翻译： 回声在包括至少一个麦克风和扬声器的通信设备中被取消。 通过至少一个第一滤波器对指向扬声器的信号进行滤波。 从麦克风接收的信号中减去滤波后的信号。 至少一个第二滤波器滤除相减结果以产生对应于由麦克风接收的语音信号的信号。 至少一个第三滤波器滤除相减的结果以产生对应于来自扬声器的回波的信号。 来自第三滤波器的输出从第二滤波器的输出中减去以产生回波消除信号。 该设备可以包括多个麦克风，并且第一，第二和第三滤波器可以各自包括等于麦克风数量的多个滤波器。 可以添加来自第二滤波器的输出，可以添加来自第三滤波器的输出，并且可以从第二滤波器的输出的和中减去来自第三滤波器的输出的和。 来自第三滤波器的输出可以在从第二滤波器的输出中减去之前被加权。

公开(公告)号：US06563861B1

公开(公告)日：2003-05-13

申请号：US09273480

申请日：1999-03-22

申请人： Leonid Krasny ,  Sandeep Chennakeshu ,  David Koilpillai

发明人： Leonid Krasny ,  Sandeep Chennakeshu ,  David Koilpillai

IPC分类号： H04B1500

CPC分类号： H04B7/01 ,  H04B1/707 ,  H04B1/709 ,  H04B2201/70701

摘要： A receiving apparatus Doppler spread estimator includes a receiver receiving signals over a transmission channel that varies over time due to fading and converting the signals to digital samples for processing. A stationarizer operatively associated with the receiver stationarizes the digital samples. An estimator is operatively associated with the stationarizer for estimating spectral density of the stationarized digital samples. The correlator is operatively coupled to the estimator for correlating the spectral density estimates with functions corresponding to hypotheses of plural Doppler spread values to select one of the Doppler spread values as an estimate of actual Doppler spread.

摘要翻译： 接收装置多普勒扩展估计器包括接收器，其通过传输信道接收由于衰落而随时间变化的信号，并将信号转换为数字样本进行处理。 与接收器可操作地相关联的台式计算机将数字样本平均化。 估计器可操作地与台式计算机相关联，用于估计平台化数字样本的频谱密度。 相关器可操作地耦合到估计器，用于将频谱密度估计与对应于多个多普勒扩展值的假设的函数相关联，以选择多普勒扩展值中的一个作为实际多普勒扩展的估计。

公开(公告)号：US06349278B1

公开(公告)日：2002-02-19

申请号：US09368596

申请日：1999-08-04

申请人： Leonid Krasny ,  Soontorn Oraintara ,  Truong Nguyen

发明人： Leonid Krasny ,  Soontorn Oraintara ,  Truong Nguyen

IPC分类号： G10L2102

CPC分类号： G10L25/78

摘要： A method for signal detection uses a likelihood ratio derived from the received signal to produce an estimate of a speech signal that has been corrupted by noise during transmission. The received signal is input to a receiver filter and a voice-activity detector. The receiver filter filters the received signal to produce a filter output signal. The voice-activity detector generates a likelihood ratio based on the received signal, which is then used to produce a speech-probability estimate indicating the probability that the received signal includes a speech signal. The filter output signal is combined with the speech-probability estimate output from the voice-activity detector to generate a soft estimate of the original speech signal.

摘要翻译： 用于信号检测的方法使用从接收信号导出的似然比来产生在传输期间被噪声破坏的语音信号的估计。 接收的信号被输入到接收机滤波器和语音活动检测器。 接收机滤波器对接收到的信号进行滤波以产生滤波器输出信号。 语音活动检测器基于接收信号产生似然比，然后该接收信号用于产生指示接收信号包括语音信号的概率的语音概率估计。 滤波器输出信号与来自语音活动检测器的语音概率估计输出组合，以产生原始语音信号的软估计。

公开(公告)号：US08401487B2

公开(公告)日：2013-03-19

申请号：US12650201

申请日：2009-12-30

申请人： Paul W. Dent ,  Leonid Krasny

发明人： Paul W. Dent ,  Leonid Krasny

IPC分类号： H04B17/00

CPC分类号： H04L25/022 ,  H04L25/0222 ,  H04L25/0232

摘要： A receiver and receive processing method described herein improves the accuracy of channel estimates by correcting for the assumption that the Doppler shift (or rate-of-change-of-delay) stays constant for each frequency within a signal bandwidth of a received signal. To that end, a receiver according to the present invention comprises a channel processor having multiple processing units. A first processing unit processes reference values (e.g., pilot signals) received for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times (or the complex propagation channel coefficients estimated therefrom) to determine a set of complex wave amplitudes either for each of multiple frequencies in the signal bandwidth or for each of the different signal times. A second processing unit subsequently processes the complex wave amplitudes to determine complex scattering coefficients, where each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel.

摘要翻译： 本文描述的接收机和接收处理方法通过校正多普勒频移（或延迟变化率）在接收信号的信号带宽内对于每个频率保持恒定的假设来提高信道估计的精度。 为此，根据本发明的接收机包括具有多个处理单元的信道处理器。 第一处理单元处理在多个不同信号时间（或从其估计的复数传播信道系数）内在信号带宽内的多个频率中的每一个接收的参考值（例如，导频信号），以确定一组复波幅度 对于信号带宽中的多个频率中的每一个或针对不同信号时间的每一个， 第二处理单元随后处理复波幅度以确定复散射系数，其中每个复散射系数对应于无线通信信道中的相应散射物体。

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：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。