公开(公告)号：US08964912B2

公开(公告)日：2015-02-24

申请号：US11219183

申请日：2005-09-02

申请人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Yi-Pin Eric Wang

发明人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Yi-Pin Eric Wang

IPC分类号： H04B1/10 ,  H04B1/712 ,  H04B1/7117

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

摘要： A method and apparatus for determining operating modes in a receiver is described herein. A delay searcher in the receiver detects a signal image in the received signal. When the receiver is a RAKE receiver, a plurality of RAKE fingers coherently combine time-shifted versions of the received signal at different delays. Alternatively, when the receiver is a chip equalization receiver, an FIR filter coherently pre-combines the signal images in the received signal. A processor determines delays. In particular, the processor generates a first signal quality metric for a single-delay receiver mode, and generates a second signal quality metric for a multi-delay receiver mode. Based on a comparison of the first and second signal quality metrics, the processor selects the single-delay or the multi-delay receiver mode for processing the signal image.

摘要翻译： 本文描述了用于确定接收机中的操作模式的方法和装置。 接收机中的延迟搜索器检测接收信号中的信号图像。 当接收机是RAKE接收机时，多个RAKE指头以不同的延迟相干地组合接收信号的时移版本。 或者，当接收机是芯片均衡接收机时，FIR滤波器相干地预组合接收信号中的信号图像。 处理器确定延迟。 特别地，处理器为单延迟接收器模式产生第一信号质量度量，并且产生用于多延迟接收器模式的第二信号质量度量。 基于第一和第二信号质量度量的比较，处理器选择用于处理信号图像的单延迟或多延迟接收器模式。

公开(公告)号：US08576960B2

公开(公告)日：2013-11-05

申请号：US12628341

申请日：2009-12-01

申请人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Elias Jonsson

发明人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Elias Jonsson

IPC分类号： H04L27/06 ,  H04L23/02

CPC分类号： H04L25/03006 ,  H04B1/71057 ,  H04B2201/709727 ,  H04L25/03178 ,  H04L25/03203 ,  H04L25/03331 ,  H04L2025/03426

摘要： The computation of code-specific channel matrices for an Assisted Maximum Likelihood Detection (AMLD) receiver comprises separately computing high rate matrices that change each symbol period, and a low rate matrix that is substantially constant over a plurality of symbol periods. The high and low rate matrices are combined to generate a code-specific channel matrix for each receiver stage. The high rate matrices include scrambling and spreading code information, and the low rate matrices include information on the net channel response and combining weights. The low rate matrices are efficiently computed by a linear convolution in the frequency domain of the net channel response and combining weights (with zero padding to avoid circular convolution), then transforming the convolution to the time domain and extracting matrix elements. Where the combining weights are constant across stages, a common code-specific channel matrix may be computed and used in multiple AMLD receiver stages.

摘要翻译： 用于辅助最大似然检测（AMLD）接收机的代码特定信道矩阵的计算包括分别计算改变每个符号周期的高速率矩阵和在多个符号周期上基本上恒定的低速率矩阵。 组合高速和低速率矩阵以为每个接收机级生成代码特定的信道矩阵。 高速率矩阵包括加扰和扩展码信息，低速率矩阵包括关于网络信道响应和组合权重的信息。 低速率矩阵通过网络通道响应的频域中的线性卷积和组合权重（零填充以避免循环卷积）有效地计算，然后将卷积变换到时域并提取矩阵元素。 在组合权重跨越阶段恒定的情况下，可以在多个AMLD接收机阶段中计算和使用公共的特定码通道矩阵。

公开(公告)号：US20090116455A1

公开(公告)日：2009-05-07

申请号：US11935840

申请日：2007-11-06

申请人： Gregory E. Bottomley ,  Douglas A. Cairns ,  Yi-Pin Eric Wang

发明人： Gregory E. Bottomley ,  Douglas A. Cairns ,  Yi-Pin Eric Wang

IPC分类号： H04B7/216

CPC分类号： H04B1/7103 ,  H04B1/712 ,  H04B2201/709727

摘要： As taught herein channelization code power estimates are generated for a number of data channels in a received CDMA signal based on a joint determination process. Joint processing in this context yields improved estimation of data channel code powers and corresponding estimations of noise variance. These improvements arise from exploitation of joint processing of measured data value correlations across two or more data channel codes represented in the received signal. In one or more embodiments, joint determination of data channel code powers comprises forming a correlation matrix as a weighted average of correlations determined for a plurality of data channels. In one or more other embodiments, joint determination of data channel code powers comprises jointly fitting the correlation matrices for a plurality of data channels in a least squares error estimation process.

摘要翻译： 如本文所教导的，基于联合确定过程，对接收的CDMA信号中的多个数据信道生成信道化码功率估计。 在这种情况下的联合处理可以改善数据信道码功率的估计和噪声方差的相应估计。 这些改进是由于在接收到的信号中表示的两个或多个数据信道代码之间对测量的数据值相关性的联合处理的利用。 在一个或多个实施例中，数据信道码功率的联合确定包括形成相关矩阵作为为多个数据信道确定的相关性的加权平均值。 在一个或多个其他实施例中，数据信道码功率的联合确定包括在最小二乘误差估计过程中共同拟合多个数据信道的相关矩阵。

公开(公告)号：US08295329B2

公开(公告)日：2012-10-23

申请号：US11850837

申请日：2007-09-06

申请人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Karl J. Molnar

发明人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Karl J. Molnar

IPC分类号： H04B1/00

CPC分类号： H04B1/71055 ,  H04B1/7115 ,  H04B2201/709727

摘要： A symbol detector converts initial symbol estimates of received symbols to soft estimates for decoding. The symbol detector computes spreading waveform correlations between a spreading waveform for a symbol of interest and spreading waveforms for one or more interfering symbols. Interference rejection terms are computed by scaling the spreading waveform correlations by corresponding signal powers and compensating for noise. A soft scaling factor for the symbol of interest is computed from the interference rejection terms. The soft scaling factors are then applied to the initial symbol estimates to generate the soft estimates.

摘要翻译： 符号检测器将接收符号的初始符号估计转换为用于解码的软估计。 符号检测器计算感兴趣符号的扩展波形和一个或多个干扰符号的扩展波形之间的扩展波形相关性。 通过相应的信号功率缩放扩展波形相关性并补偿噪声来计算干扰抑制项。 根据干扰抑制项计算感兴趣符号的软缩放因子。 然后将软缩放因子应用于初始符号估计以产生软估计。

公开(公告)号：US07920619B2

公开(公告)日：2011-04-05

申请号：US11739924

申请日：2007-04-25

申请人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Douglas A. Cairns

发明人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Douglas A. Cairns

IPC分类号： H04B1/00

CPC分类号： H04L25/024 ,  H04B1/7105 ,  H04B2201/709727

摘要： A method and apparatus for reducing the complexity of waveform correlation computations used by a multicode receiver is described herein. One exemplary multicode receiver includes a despreading unit, channel estimator, and waveform correlation calculator. The despreading unit despreads a received multicode signal to generate despread symbols. The channel estimator estimates channel coefficients associated with the despread symbols. The waveform correlation calculator determines waveform correlations between the transmitted symbols in successive processing windows that span two or more symbol periods and that overlap in time. To reduce the computational complexity associated with computing waveform correlations, the calculator may reuse channel coefficients and/or net channel correlations for multiple symbol periods and/or processing windows. The calculator may also reduce complexity by reusing one or more waveform correlations from a previous processing window as waveform correlations for one or more subsequent processing windows and/or by exploiting the Hermitian symmetry of the waveform correlation matrix.

摘要翻译： 这里描述了一种降低多码接收机使用的波形相关计算的复杂度的方法和装置。 一个示例性多码接收机包括解扩单元，信道估计器和波形相关计算器。 解扩单元对接收到的多码信号进行解扩，以产生解扩符号。 信道估计器估计与解扩符号相关联的信道系数。 波形相关计算器确定跨越两个或多个符号周期并且在时间上重叠的连续处理窗口中的发送符号之间的波形相关性。 为了减少与计算波形相关性相关联的计算复杂度，计算器可以重用多个符号周期和/或处理窗口的信道系数和/或净信道相关性。 计算器还可以通过将来自先前处理窗口的一个或多个波形相关作为一个或多个后续处理窗口的波形相关性和/或通过利用波形相关矩阵的埃米特对称来重新降低复杂度。

公开(公告)号：US07848389B2

公开(公告)日：2010-12-07

申请号：US11219626

申请日：2005-09-02

申请人： Carmela Cozzo ,  Douglas A. Cairns ,  Gregory E. Bottomley ,  Ali S. Khayrallah ,  Håkan B. Eriksson

发明人： Carmela Cozzo ,  Douglas A. Cairns ,  Gregory E. Bottomley ,  Ali S. Khayrallah ,  Håkan B. Eriksson

IPC分类号： H04B1/69

CPC分类号： H04B1/7103 ,  H04B1/712 ,  H04B2201/709727 ,  H04L25/0212 ,  H04L25/0222 ,  H04L25/0228

摘要： A wireless communication receiver, such as the receiver included in a wireless communication transceiver implemented in a base station or in a mobile station of a wireless communication network, includes a parametric G-RAKE receiver circuit and a method that compute parametric scaling parameters on a per transmission interval basis. In one embodiment, measured impairment correlations are obtained for an individual transmission slot and used to estimate instantaneous values of the scaling parameters. One or both of those instantaneous values are then constrained according to one or more defined limits. In other embodiments, multiple transmission slots are used to increase the number of measurements available to estimate the scaling parameters, with parameter constraining optionally applied. Further embodiments use iterative methods and/or solve for one parameter, and use the results to obtain the other parameter(s). One or more of these embodiments can be improved through the use of error correction/detection information.

摘要翻译： 无线通信接收机，例如包括在基站或无线通信网络的移动台中的无线通信收发器中的接收机，包括参数化的G-RAKE接收机电路和一个在每一个中计算参数缩放参数的方法 传输间隔的基础。 在一个实施例中，针对单个传输时隙获得测量的损害相关性，并用于估计缩放参数的瞬时值。 然后根据一个或多个限定的限制来限制那些瞬时值中的一个或两个。 在其他实施例中，使用多个传输时隙来增加可用于估计缩放参数的测量数量，并且可选地应用参数约束。 另外的实施例使用迭代方法和/或解决一个参数，并且使用结果来获得其他参数。 可以通过使用错误校正/检测信息来改进这些实施例中的一个或多个。

公开(公告)号：US07778312B2

公开(公告)日：2010-08-17

申请号：US11402676

申请日：2006-04-12

申请人： Douglas A. Cairns ,  Gregory E. Bottomley

发明人： Douglas A. Cairns ,  Gregory E. Bottomley

IPC分类号： H04B1/00

CPC分类号： H04L25/03044 ,  H04B1/7117 ,  H04B1/712 ,  H04B2201/70707 ,  H04B2201/709727 ,  H04L2025/03477 ,  H04L2025/03515

摘要： A receiver includes a baseband processor for selecting a set of demodulation processing delays for received signal demodulation from a larger set of candidate delays. In one embodiment, the baseband processor selects the set of demodulation processing delays by calculating at least one metric for each demodulation processing delay in the set of candidate delays, iteratively reducing the set of candidate delays by eliminating one or more demodulation processing delays from the set as a function of comparing the metrics, and setting the processing delays for received signal demodulation to the candidate delays remaining after reduction. In a Generalized RAKE (G-RAKE) embodiment, the metric corresponds to combining weight magnitudes associated with G-RAKE finger delays. In a chip equalizer embodiment, the metric corresponds to coefficient magnitudes associated with equalization filter tap delays. In other embodiments, the metric corresponds to Signal to Interference Ratios (SIRs) associated with the set of candidate delays.

摘要翻译： 接收机包括基带处理器，用于从更大的一组候选延迟中选择用于接收信号解调的一组解调处理延迟。 在一个实施例中，基带处理器通过针对候选延迟集合中的每个解调处理延迟计算至少一个度量来选择一组解调处理延迟，通过从集合中消除一个或多个解调处理延迟来迭代地减少候选延迟集合 作为比较度量的函数，以及将接收信号解调的处理延迟设置为在还原之后剩余的候选延迟。 在广义RAKE（G-RAKE）实施例中，度量对应于与G-RAKE手指延迟相关联的重量幅度。 在码片均衡器实施例中，度量对应于与均衡滤波器抽头延迟相关联的系数幅度。 在其他实施例中，度量对应于与该组候选延迟相关联的信号与干扰比（SIR）。

公开(公告)号：US07688881B2

公开(公告)日：2010-03-30

申请号：US11479483

申请日：2006-06-30

申请人： Douglas A. Cairns ,  Gregory E. Bottomley

发明人： Douglas A. Cairns ,  Gregory E. Bottomley

IPC分类号： H04B1/707

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： According to one embodiment taught herein, a method of determining impairment correlations between a plurality of delays of interest for a received CDMA signal comprises generating kernel functions as samples of a net channel response of the received CDMA signal taken at defined chip sampling phases for delay differences between the plurality of delays of interest. In a parametric Generalized Rake (G-Rake) receiver embodiment, the delays of interest represent the delay positions of the fingers being used to characterized received signal. In a chip equalizer receiver embodiment, the delays of interest represent the delay positions of the equalizer taps. The method continues with determining impairment correlations based on convolving the kernel functions. Corresponding receiver circuits, including an impairment correlation estimation circuit configured for parametric G-Rake operation, may be implemented in a variety of communication devices and systems, such as in wireless communication network base stations and mobile stations.

摘要翻译： 根据本文教导的一个实施例，确定接收的CDMA信号的多个感兴趣延迟之间的损害相关性的方法包括：生成内核函数，作为在限定的码片采样相位处采用的接收CDMA信号的净信道响应的样本，用于延迟差 在多个感兴趣的延迟之间。 在参数广义耙（G-Rake）接收机实施例中，感兴趣的延迟表示用于指定的接收信号的手指的延迟位置。 在码片均衡器接收器实施例中，感兴趣的延迟表示均衡器抽头的延迟位置。 该方法继续确定基于卷积核函数的损害相关性。 包括配置用于参数G-Rake操作的损害相关估计电路的对应的接收器电路可以在诸如无线通信网络基站和移动站中的各种通信设备和系统中实现。

公开(公告)号：US20080267261A1

公开(公告)日：2008-10-30

申请号：US11739924

申请日：2007-04-25

申请人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Douglas A. Cairns

发明人： Yi-Pin Eric Wang ,  Gregory E. Bottomley ,  Douglas A. Cairns

IPC分类号： H04B1/69

CPC分类号： H04L25/024 ,  H04B1/7105 ,  H04B2201/709727

摘要： A method and apparatus for reducing the complexity of waveform correlation computations used by a multicode receiver is described herein. One exemplary multicode receiver includes a despreading unit, channel estimator, and waveform correlation calculator. The despreading unit despreads a received multicode signal to generate despread symbols. The channel estimator estimates channel coefficients associated with the despread symbols. The waveform correlation calculator determines waveform correlations between the transmitted symbols in successive processing windows that span two or more symbol periods and that overlap in time. To reduce the computational complexity associated with computing waveform correlations, the calculator may reuse channel coefficients and/or net channel correlations for multiple symbol periods and/or processing windows. The calculator may also reduce complexity by reusing one or more waveform correlations from a previous processing window as waveform correlations for one or more subsequent processing windows and/or by exploiting the Hermitian symmetry of the waveform correlation matrix.

摘要翻译： 这里描述了一种降低多码接收机使用的波形相关计算的复杂度的方法和装置。 一个示例性多码接收机包括解扩单元，信道估计器和波形相关计算器。 解扩单元对接收到的多码信号进行解扩，以产生解扩符号。 信道估计器估计与解扩符号相关联的信道系数。 波形相关计算器确定跨越两个或多个符号周期并且在时间上重叠的连续处理窗口中的发送符号之间的波形相关性。 为了减少与计算波形相关性相关联的计算复杂度，计算器可以重用多个符号周期和/或处理窗口的信道系数和/或净信道相关性。 计算器还可以通过将来自先前处理窗口的一个或多个波形相关作为一个或多个后续处理窗口的波形相关性和/或通过利用波形相关矩阵的埃米特对称来重新降低复杂度。

公开(公告)号：US08295417B2

公开(公告)日：2012-10-23

申请号：US12133636

申请日：2008-06-05

申请人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Andreas Cedergren ,  Tracy L. Fulghum ,  Elias Jonsson

发明人： Douglas A. Cairns ,  Gregory E. Bottomley ,  Andreas Cedergren ,  Tracy L. Fulghum ,  Elias Jonsson

IPC分类号： H04B7/10

CPC分类号： H04B1/7117 ,  H04B1/712

摘要： Methods and apparatus for determining an impairment covariance matrix for use in an interference-suppressing CDMA receiver are disclosed. In several of the disclosed embodiments, precise information regarding signal propagation delays is not needed. An exemplary method includes the selection of a plurality of processing delays for processing a received CDMA signal. Net channel coefficients for the processing delays are estimated and used to calculate an impairment covariance matrix. The impairment covariance matrix is calculated as a function of the estimated net channel coefficients and the processing delays, without estimating a propagation medium channel response for the received signal.

摘要翻译： 公开了用于确定用于干扰抑制CDMA接收机的损害协方差矩阵的方法和装置。 在所公开的几个实施例中，不需要关于信号传播延迟的精确信息。 一种示例性方法包括选择用于处理所接收的CDMA信号的多个处理延迟。 用于处理延迟的净通道系数被估计并用于计算损害协方差矩阵。 损伤协方差矩阵作为估计的净通道系数和处理延迟的函数计算，而不估计接收信号的传播介质通道响应。