公开(公告)号：US20090268787A1

公开(公告)日：2009-10-29

申请号：US12111526

申请日：2008-04-29

申请人： Douglas A. Cairns ,  Stephen J. Grant ,  Andres Reial ,  Mathias Riback

发明人： Douglas A. Cairns ,  Stephen J. Grant ,  Andres Reial ,  Mathias Riback

IPC分类号： H04L27/06

CPC分类号： H04B1/712 ,  H04B1/7105 ,  H04B1/7117 ,  H04B2201/709727

摘要： According to the teachings presented herein, a wireless communication apparatus compensates for timing misalignment in its received signal processing. In at least one embodiment, the apparatus estimates a set of path delays for a received signal and sets processing delays on the estimated path delays. The apparatus jointly hypothesizes combinations of fractional timing offsets for two or more paths, and computes a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis. As non-limiting examples, the decision metric may be a signal quality metric, or a distance metric (such as between a measured net channel response and an effective net channel response reconstructed as a function of the combination of fractional timing offsets included in the joint hypothesis). The apparatus evaluates the decision metrics to identify a best estimate of timing misalignment, and correspondingly compensates coherent processing of the received signal.

摘要翻译： 根据本文提出的教导，无线通信装置补偿其接收信号处理中的定时未对准。 在至少一个实施例中，该装置估计接收信号的一组路径延迟并且对所估计的路径延迟设置处理延迟。 该装置共同假设两个或多个路径的分数定时偏移的组合，并且计算指示联合假设的准确性的每个联合假设的决策度量。 作为非限制性示例，决策度量可以是信号质量度量或距离度量（诸如在测量的净信道响应和作为包括在联合中的分数定时偏移的组合的函数之间重建的有效网络信道响应之间） 假设）。 设备评估决策度量以识别定时未对准的最佳估计，并相应地补偿接收信号的相干处理。

公开(公告)号：US20090245441A1

公开(公告)日：2009-10-01

申请号：US12058494

申请日：2008-03-28

申请人： Douglas A. Cairns ,  Stephen Grant

发明人： Douglas A. Cairns ,  Stephen Grant

IPC分类号： H03D1/04 ,  H04B1/10 ,  H04L25/08

CPC分类号： G06F17/12 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/0848 ,  H04B7/0854 ,  H04B7/0857 ,  H04B2201/70707 ,  H04B2201/709727

摘要： In receiving equipment such as a mobile terminal (1) for decoding received signals coded according to a CDMA method are decoded in an intermediate processor (9). In the decoding, coefficients or elements of a vector w are calculated in a unit or module (13) by an iterative method as a solution to a system of linear equations represented by the matrix equation Rw=h, where R is a matrix of known elements and h is a known vector. For terminating the iteration, a value of the signal to interference plus noise ratio SINR for the received signals is calculated in each iteration step and then this calculated value or a quantity derived therefrom is used as a stopping criterion or generally in a stopping algorithm.

摘要翻译： 在用于解码根据CDMA方法编码的接收信号的移动终端（1）的接收设备中，在中间处理器（9）中被解码。 在解码中，矢量w的系数或元素通过迭代方法以单位或模块（13）计算，作为由矩阵方程Rw = h表示的线性方程组的解，其中R是已知的矩阵 元素和h是已知的向量。 为了终止迭代，在每个迭代步骤中计算接收信号的信号与干扰加噪声比SINR的值，然后将该计算值或从其导出的量用作停止标准或通常用于停止算法。

公开(公告)号：US07027591B2

公开(公告)日：2006-04-11

申请号：US10272095

申请日：2002-10-16

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A combined processor, such as might be used in a mobile handset or hands-free communication device, provides residual echo suppression and noise reduction while eliminating the need for explicit comfort noise generation. Operating within a near-end communication device, the processor receives an echo-canceled signal that is derived from a near-end input signal, and generates an output signal for subsequent transmission to a far-end communication device by applying a noise attenuation factor to the echo-canceled signal or to an average of that signal. The processor maintains the average signal across periods of speech and non-speech. During far-end-modes of operation, where only incoming audio from the far-end is active, the processor substitutes the average signal for the echo-canceled signal, such that a far-end listener receives the natural sounding average signal without receiving the objectionable, residual echo that may be in the echo-canceled signal.

摘要翻译： 诸如可能用于移动手持机或免提通信设备中的组合处理器提供残余回波抑制和噪声降低，同时消除对显着的舒适噪声生成的需要。 在近端通信设备中操作，处理器接收从近端输入信号导出的回波消除信号，并且通过将噪声衰减因子应用于远端通信设备产生用于后续传输到远端通信设备的输出信号 回波消除信号或该信号的平均值。 处理器保持跨语音和非语音的平均信号。 在远端操作模式中，只有来自远端的输入音频处于活动状态，处理器将平均信号替换为回波消除信号，使得远端收听者接收到自然探测平均信号而不接收 令人反感的残余回波可能在回波消除信号中。

公开(公告)号：US07006790B2

公开(公告)日：2006-02-28

申请号：US09870072

申请日：2001-05-30

申请人： L. Scott Bloebaum ,  Douglas A. Cairns

发明人： L. Scott Bloebaum ,  Douglas A. Cairns

IPC分类号： H04B7/185

CPC分类号： G01S19/21 ,  G01S19/05 ,  G01S19/30 ,  H04L7/0334

摘要： In a satellite navigation system receiver co-located with a wireless communication system mobile terminal, periodic interference from the mobile terminal preventing bit-edge synchronization with one or more satellite signals is overcome by using Time Difference Of Arrival (TDOA) values associated with the satellite signals. Either a satellite signal free of periodic interference is chosen by inspection of the TDOA values, or the TDOA values are ranked and synchronization is attempted iteratively. Once a satellite signal is synchronized, the TDOA values are used to calculate synchronization for the remaining signals. The TDOA values may be transmitted to the mobile terminal by a satellite navigation signal information server connected to the wireless communication system, either individually or in broadcast mode to one or more cells. Alternatively, the mobile terminal may acquire the TDOA values from memory or from another data interface.

公开(公告)号：US08224278B2

公开(公告)日：2012-07-17

申请号：US12505139

申请日：2009-07-17

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H04B1/7115 ,  H04B1/712

摘要： Path delay information generated by a path searcher module of a wireless receiver is used to generate net channel coefficients for use in suppressing interference from a received signal. According to one embodiment, interference is suppressed from a signal transmitted over a communication channel including transmit and receive pulse shaping filters and a radio channel by generating net channel coefficients for the communication channel at processing delays such as G-Rake finger delays or chip equalizer tap delays. Medium channel coefficients are generated for the radio channel at estimated path delays as a function of the net channel coefficients. The net channel coefficients are regenerated at arbitrary delays as a function of the medium channel coefficients and an impairment covariance estimate is generated based at least in part on the regenerated net channel coefficients.

摘要翻译： 由无线接收机的路径搜索器模块产生的路径延迟信息用于产生用于抑制来自接收信号的干扰的净信道系数。 根据一个实施例，通过在包括发射和接收脉冲整形滤波器以及无线电信道的通信信道上发送的信号来抑制干扰，所述信号通过在处理延迟例如G-Rake手指延迟或码片均衡器抽头上产生通信信道的净通道系数 延误 作为净通道系数的函数，以估计的路径延迟为无线电信道生成中等信道系数。 净通道系数以任意延迟再生，作为介质通道系数的函数，并且至少部分地基于再生的净通道系数产生损害协方差估计。

公开(公告)号：US07983208B2

公开(公告)日：2011-07-19

申请号：US11935604

申请日：2007-11-06

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04B7/216

CPC分类号： H04B1/712 ,  H04B1/7115 ,  H04B2201/709727 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/024

摘要： Methods and apparatus are disclosed for calculating a channel response for use in received signal processing. In an exemplary embodiment, a method comprises calculating a channel response correlation matrix based on measured channel responses derived from pilot symbols in a received signal and forming a traffic data correlation matrix based on measurements of traffic symbols in the received signal. The traffic data correlation matrix, the channel response correlation matrix, and the measured channel responses are used in an minimum mean-squared error (MMSE) estimation process to calculate the channel response estimates. In one or more embodiments, the calculated channel response estimates comprise estimates of net channel response corresponding to signal processing delays in a G-RAKE receiver. An exemplary receiver circuit comprises a baseband processor configured to calculate channel response estimates according to one or more of the disclosed methods.

摘要翻译： 公开了用于计算在接收信号处理中使用的信道响应的方法和装置。 在示例性实施例中，一种方法包括基于从接收信号中的导频符号导出的测量信道响应来计算信道响应相关矩阵，并且基于接收信号中业务符号的测量形成业务数据相关矩阵。 在最小均方误差（MMSE）估计过程中使用业务数据相关矩阵，信道响应相关矩阵和测量的信道响应来计算信道响应估计。 在一个或多个实施例中，所计算的信道响应估计包括对应于G-RAKE接收机中的信号处理延迟的净信道响应的估计。 示例性的接收机电路包括被配置为根据所公开的方法中的一个或多个来计算信道响应估计的基带处理器。

公开(公告)号：US07711035B2

公开(公告)日：2010-05-04

申请号：US10943274

申请日：2004-09-17

申请人： Douglas A. Cairns ,  Leonid Krasny

发明人： Douglas A. Cairns ,  Leonid Krasny

IPC分类号： H04B1/00

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：US20090052584A1

公开(公告)日：2009-02-26

申请号：US11841264

申请日：2007-08-20

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H03D1/00

CPC分类号： H04B7/0854 ,  H04B1/7107 ,  H04B1/712 ,  H04B2201/709727 ,  H04L1/0002 ,  H04L1/20

摘要： Signal quality estimation and demodulation are tailored to the received signal quality. According to one embodiment, a received signal is processed by determining a first set of combining weights based on a first impairment covariance estimate derived assuming a low signal quality environment. A second set of combining weights is determined based on a second impairment covariance estimate derived assuming a high signal quality environment. A metric is determined corresponding to the difference between symbol estimates derived from the second set of combining weights and hard symbol decisions. The received signal is demodulated based on the second set of combining weights if the metric satisfies a threshold indicating high signal quality and otherwise based on the first set of combining weights.

摘要翻译： 信号质量估计和解调是针对接收到的信号质量量身定制的。 根据一个实施例，通过基于假设低信号质量环境导出的第一损害协方差估计来确定第一组合权重来处理接收信号。 基于假设高信号质量环境导出的第二损害协方差估计来确定第二组组合权重。 对应于从第二组合权重和硬符号决定导出的符号估计之间的差确定度量。 如果度量满足指示高信号质量的阈值，或者否则基于第一组合权重，则基于第二组合合权重解调接收信号。

公开(公告)号：US20080291887A1

公开(公告)日：2008-11-27

申请号：US11935604

申请日：2007-11-06

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H04J13/04 ,  H04B1/707

CPC分类号： H04B1/712 ,  H04B1/7115 ,  H04B2201/709727 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/024

摘要： Methods and apparatus are disclosed for calculating a channel response for use in received signal processing. In an exemplary embodiment, a method comprises calculating a channel response correlation matrix based on measured channel responses derived from pilot symbols in a received signal and forming a traffic data correlation matrix based on measurements of traffic symbols in the received signal. The traffic data correlation matrix, the channel response correlation matrix, and the measured channel responses are used in an minimum mean-squared error (MMSE) estimation process to calculate the channel response estimates. In one or more embodiments, the calculated channel response estimates comprise estimates of net channel response corresponding to signal processing delays in a G-RAKE receiver. An exemplary receiver circuit comprises a baseband processor configured to calculate channel response estimates according to one or more of the disclosed methods.

摘要翻译： 公开了用于计算在接收信号处理中使用的信道响应的方法和装置。 在示例性实施例中，一种方法包括基于从接收信号中的导频符号导出的测量信道响应来计算信道响应相关矩阵，并且基于接收信号中业务符号的测量形成业务数据相关矩阵。 在最小均方误差（MMSE）估计过程中使用业务数据相关矩阵，信道响应相关矩阵和测量的信道响应来计算信道响应估计。 在一个或多个实施例中，所计算的信道响应估计包括对应于G-RAKE接收机中的信号处理延迟的净信道响应的估计。 示例性的接收机电路包括被配置为根据所公开的方法中的一个或多个来计算信道响应估计的基带处理器。

公开(公告)号：US07456770B2

公开(公告)日：2008-11-25

申请号：US11681213

申请日：2007-03-02

申请人： Douglas A. Cairns

发明人： Douglas A. Cairns

IPC分类号： H03M3/00

CPC分类号： H03M3/468 ,  H03M3/462 ,  H04Q9/00

摘要： The sensor network described herein uses a distributed sigma-delta converter, where each of a plurality of sensor nodes includes a sigma-delta modulator communicatively coupled to a remotely located sigma-delta processor in a control hub. Each sensor node generates a serial bit stream representative of a sensor output signal. The control hub includes a plurality of signal processors, each of which receive and digitally process the serial bit stream wirelessly transmitted by a corresponding sensor node. A controller in the control hub analyzes the digital output from each signal processor to determine one or more characteristics of the sensor network.

摘要翻译： 本文描述的传感器网络使用分布式Σ-Δ转换器，其中多个传感器节点中的每一个包括通信地耦合到控制集线器中的远程位置的Σ-Δ处理器的Σ-Δ调制器。 每个传感器节点产生代表传感器输出信号的串行比特流。 控制集线器包括多个信号处理器，每个信号处理器接收和数字处理由相应的传感器节点无线传输的串行比特流。 控制集线器中的控制器分析来自每个信号处理器的数字输出，以确定传感器网络的一个或多个特性。