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：US07751467B2

公开(公告)日：2010-07-06

申请号：US11566256

申请日：2006-12-04

申请人： Carmela Cozzo ,  Gregory E. Bottomley

发明人： Carmela Cozzo ,  Gregory E. Bottomley

IPC分类号： H04B1/00

CPC分类号： H04B1/7113 ,  H04B1/7117 ,  H04B1/712 ,  H04B2201/709727

摘要： Signal processing delays are selected from a candidate set in a wireless receiver based on both present and past channel behavior. According to one embodiment, a subset of signal processing delays are selected for received signal processing by accumulating a history of periodic delay selection computations for a candidate set of signal processing delays during a time interval. The delay selection calculations are based on cross-correlations between different ones of the signal processing delays. At the end of the time interval, a subset of the signal processing delays are selected from the candidate set of delays for received signal processing based on the history of delay selection computations.

摘要翻译： 基于现在和过去的信道行为，从无线接收机中的候选集中选择信号处理延迟。 根据一个实施例，通过在时间间隔期间累积用于信号处理延迟的候选组的周期性延迟选择计算的历史来选择信号处理延迟的子集用于接收信号处理。 延迟选择计算基于不同信号处理延迟之间的互相关。 在时间间隔结束时，基于延迟选择计算的历史，从用于接收信号处理的候选延迟集中选择信号处理延迟的子集。

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：US20090185603A1

公开(公告)日：2009-07-23

申请号：US12016608

申请日：2008-01-18

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

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

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： The teachings presented herein improve the processing of individual signals of interest included in a received composite signal by computing combining weights and/or signal quality estimates for each signal of interest, e.g., for linear equalization, based on either shared or non-shared correlation estimates. As a non-limiting advantage, the use of shared correlation estimates reduces computational loading as compared to the processing load that would be needed for computing non-shared correlation estimates for all signals of interest. As a further non-limiting advantage, the conditional use of shared and non-shared correlation estimates provides for the use of non-shared correlation estimates where signal characteristic(s) of one or more of the signals of interest warrant such usage, e.g., for one or more high-rate signals of interest.

摘要翻译： 本文提出的教导通过基于共享或非共享相关估计来计算每个感兴趣信号的组合权重和/或信号质量估计，例如用于线性均衡，来改进包括在接收到的复合信号中的感兴趣的各个信号的处理 。 作为非限制性优点，与用于计算所有感兴趣的信号的非共享相关估计所需的处理负载相比，共享相关估计的使用减少了计算负载。 作为进一步的非限制性优点，共享和非共享相关估计的条件使用提供了使用非共享相关估计，其中一个或多个感兴趣信号的信号特征允许这种使用，例如， 用于一个或多个感兴趣的高速率信号。

公开(公告)号：US07486716B2

公开(公告)日：2009-02-03

申请号：US11158665

申请日：2005-06-22

申请人： Tracy L. Fulghum ,  Gregory E. Bottomley

发明人： Tracy L. Fulghum ,  Gregory E. Bottomley

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： A wireless communication receiver obtains improved performance under certain fast fading conditions by basing one or more received signal processing operations on pre-despreading chip sample correlations rather than on post-despreading noise correlations, but preserves soft scaling information by determining one or more scaling factors that relate the chip sample correlations to the noise correlations. By way of non-limiting examples, a Generalized RAKE receiver circuit may base combining weight generation on chip sample correlations rather than on post-despreading pilot symbol noise correlations, but scale the combining weights as a function of the one or more scaling factors, or, equivalently, scale the combined values generated from the combining weights. Similar scaling may be performed with respect to chip equalization filter combining weights in a chip equalization receiver circuit. Further, Signal-to-Interference Ratio (SIR) estimation may be improved in terms of fast fading responsiveness by using chip sample correlations, while preserving the proper scaling.

摘要翻译： 无线通信接收机在某些快速衰落条件下通过将一个或多个接收到的信号处理操作基于预先解扩展芯片样本相关而不是后解扩噪声相关来获得改进的性能，但是通过确定一个或多个缩放因子来保留软缩放信息， 将芯片样本相关性与噪声相关性相关联。 作为非限制性示例，广义RAKE接收机电路可以基于片上样本相关的权重生成而不是去扩展导频符号噪声相关，但是将组合权重缩放为一个或多个缩放因子的函数，或 相等地，缩放从组合权重生成的组合值。 可以针对芯片均衡接收器电路中的码片均衡滤波器组合权重执行类似的缩放。 此外，通过使用芯片样本相关性，在保持适当的缩放的同时，可以在快速衰落响应性方面改善信号干扰比（SIR）估计。

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：US07308019B2

公开(公告)日：2007-12-11

申请号：US10151682

申请日：2002-05-20

申请人： Gregory E. Bottomley ,  Ali S. Khayrallah

发明人： Gregory E. Bottomley ,  Ali S. Khayrallah

IPC分类号： H04L27/30

CPC分类号： H04B1/7115 ,  H04B1/7117 ,  H04B2001/70935 ,  H04B2201/70705 ,  H04B2201/70707 ,  H04B2201/709727 ,  H04J13/0048

摘要： A flexible Fast Walsh Transform circuit provides configurable FWT sizes, and is suitable for use in radio receivers where the received signal may be generated using varying spreading codes and/or varying numbers of multi-codes. Such signal types are commonly encountered in wireless communication systems like those based on the Wideband CDMA (W-CDMA) or IS-2000 (cdma2000) standards, and particularly with the higher data rate provisions of those standards. In one application, a RAKE receiver includes RAKE fingers that each include one of the flexible FWT circuits, such that each finger despreads the received signal using variably sized FWTs in accordance with the characteristics of the received signal. The flexibility in FWT sizing may derive from, for example, the inclusion of separately selectable but differently sized FWT circuits, or from the inclusion of a configurable FWT circuit capable of generating different sizes of FWTs.

摘要翻译： 灵活的快速沃尔什变换电路提供可配置的FWT大小，并且适用于无线电接收机，其中接收信号可以使用变化的扩展码和/或不同数量的多码来产生。 在诸如基于宽带CDMA（W-CDMA）或IS-2000（cdma2000）标准的无线通信系统中通常遇到这样的信号类型，特别是在这些标准的较高数据速率规定中。 在一个应用中，RAKE接收机包括RAKE指，其中每个包括柔性FWT电路之一，使得每个指根据接收信号的特性使用可变大小的FWT来解扩接收信号。 FWT尺寸的灵活性可以来自例如包括单独可选择但不同尺寸的FWT电路，或者包括能够产生不同大小的FWT的可配置FWT电路。

公开(公告)号：US06597743B1

公开(公告)日：2003-07-22

申请号：US09454577

申请日：1999-12-07

申请人： Ali S. Khayrallah ,  Gregory E. Bottomley ,  Ravinder David Koilpillai ,  Kambiz Zangi

发明人： Ali S. Khayrallah ,  Gregory E. Bottomley ,  Ravinder David Koilpillai ,  Kambiz Zangi

IPC分类号： H04L2302

CPC分类号： H03M13/3955

摘要： A reduced search symbol estimation algorithm includes a forward recursion, a backward recursion, and a combining step. To reduce complexity, during the forward and backward recursions, the number of survivor states retained at each stage is less than the total number of states of the trellis. The survivor states are selected from a group of candidate states, that are connected by branches to survivors from the previous stage of the recursion. The decoder compares the accumulated path metrics for each candidate state and retains a specified number of states that is less than the total possible number of states. For the forward recursion, the retained states or survivor states, denoted as Qk, are stored along with the corresponding state metrics. For the backward recursion, the retained states, denoted as Rk, are stored along with the corresponding state metrics. During the combining step, the computation of a soft value is restricted to branches (s′,s) connecting survivor states s′ and s in the forward and backward recursions respectively.

摘要翻译： 减少的搜索符号估计算法包括正向递归，反向递归和组合步骤。 为了减少复杂性，在向前和向后递归期间，每个阶段保留的幸存者国家数量小于网格状态总数。 幸存者状态是从一组候选国中选出的，这些候选国通过分支到递归的前一阶段与幸存者相连。 解码器比较每个候选状态的累积路径度量，并保留小于总可能状态数的指定数量的状态。 对于正向递归，保留状态或幸存者状态（表示为Qk）与相应的状态度量一起存储。 对于反向递归，表示为Rk的保留状态与相应的状态度量一起存储。 在组合步骤中，软值的计算分别限制在向前和向后递归中连接幸存者状态s'和s的分支（s'，s）。