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    • 1. 发明授权
    • Efficient filter implementation
    • 高效的过滤器实现
    • US06411976B1
    • 2002-06-25
    • US09131929
    • 1998-08-10
    • Richard Adam CesariXiao-An Wang
    • Richard Adam CesariXiao-An Wang
    • G06F1710
    • H03H17/0286H03H17/0227
    • An N-stage finite impulse response (FIR) filter embodying the invention includes a first filter section whose filter coefficients are made either 1 or zero (rather than 1 and −1) in order to produce a first output (i.e., C1) and a second filter section for producing a second output (i.e., C2), which when combined (added to or subtracted from) with the first output produces an output function (i.e., Cn) which is equal to that produced by an N-stage FIR filter implementing filter coefficients having a value of either 1 or −1. In a preferred embodiment, the first filter section computes the function C1 = ∑ k = 0 N - 1 ⁢ y ⁡ ( n - k ) · x ⁡ ( k ) + 1 2 ; and the second filter section computes the function C2 = ∑ k = 0 N - 1 ⁢ y ⁡ ( n - k ) . The functions C1 and C2 may be combined to produce an output function equal to 2[C1−(½)C2] or 2C1−C2.
    • 实施本发明的N阶有限脉冲响应(FIR)滤波器包括第一滤波器部分,其滤波器系数为1或0(而不是1和-1),以便产生第一输出(即,C1)和 第二滤波器部分,用于产生第二输出(即C2),当与第一输出组合(相加或相减时)产生等于由N级FIR滤波器产生的输出函数(即,Cn) 实现值为1或-1的滤波器系数。 在优选实施例中,第一滤波器部分计算功能,第二滤波器部分计算功能。功能C1和C2可以被组合以产生等于2 [C1(1/2)C2]或2C1-C2的输出功能。
    • 3. 发明授权
    • Digital communication system for high-speed complex correlation
    • 数字通信系统用于高速复杂相关
    • US6163563A
    • 2000-12-19
    • US997715
    • 1997-12-23
    • Thomas Wesley BakerRichard Adam CesariRavi Kumar Kolagotla
    • Thomas Wesley BakerRichard Adam CesariRavi Kumar Kolagotla
    • H04B1/707A61F2/06
    • H04B1/707
    • A receiver for a spread spectrum communication system is disclosed in which a transmitter transmits a data signal to a receiver includes a memory for storing digital representation of the data signal received by the receiver. A memory input addressing unit defines a circulating data window. A first ring shift register circulates a first set of components of a spreading code. A second ring shift register circulates a second set of components of a spreading code. A selector selects one of the first set of components or the second set of components as selected components of the spreading code and an adder receives as inputs digital representations of the data signal from the circulating data window and the selected components of the spreading code. The adder provides an output that is the dot product of the inputs.
    • 公开了一种用于扩展频谱通信系统的接收机,其中发射机向接收机发送数据信号包括用于存储由接收机接收的数据信号的数字表示的存储器。 存储器输入寻址单元定义循环数据窗口。 第一个环形移位寄存器循环扩展码的第一组分量。 第二环移位寄存器循环扩展码的第二组分量。 选择器选择第一组分量或第二​​组分量中的一个作为扩展码的选定分量,加法器从循环数据窗口和扩展码的选定分量接收作为数据信号的数字表示的数字表示。 加法器提供输出,它是输入的积积。
    • 4. 发明授权
    • Viterbi decoder with reduced metric computation
    • 维特比解码器,具有降低的度量计算
    • US5844947A
    • 1998-12-01
    • US772612
    • 1996-12-23
    • Richard Adam Cesari
    • Richard Adam Cesari
    • H03M13/41H04L1/00H03D1/00H04L27/06
    • H04L1/0053H03M13/3961H03M13/4107H03M13/6502H04L1/0054
    • There is disclosed a method and apparatus for computing branch metrics that are combinations of autocorrelation and cross correlation terms are constructed by first calculating and storing components of the autocorrelation and cross correlation terms at a symbol instant. Once calculated and stored, predetermined ones of the autocorrelation components and the cross correlation components are selected. The selected autocorrelation components and cross correlation components, or their inverse as predetermined, are combined to produce a branch metric. Other predetermined combinations of the stored components of autocorrelation and cross correlation terms, or their inverse, are combined to produce other branch metrics at the same symbol instant. All branch metrics associated with the symbol instant can be calculated in this manner. The components of the autocorrelation terms and cross correlation terms associated with the next symbol instant are calculated and stored, and the process of generating the branch metrics repeated.
    • 公开了一种用于计算作为自相关和互相关项的组合的分支度量的方法和装置,其通过首先在符号时刻计算和存储自相关和互相关项的分量来构造。 一旦计算并存储,则选择自相关分量和互相关分量中的预定值。 所选择的自相关分量和互相关分量或其预定的反相被组合以产生分支度量。 存储的自相关和相关项的组分或其逆的其他预定组合被组合以产生在相同符号时刻的其他分支度量。 可以以这种方式计算与符号时刻相关联的所有分支度量。 计算并存储与下一个符号时刻相关联的自相关项和互相关项的分量,并重复生成分支度量的过程。
    • 6. 发明授权
    • Method of efficient branch metric computation for a Viterbi
convolutional decoder
    • 维特比卷积解码器的有效分支度量计算方法
    • US5912908A
    • 1999-06-15
    • US976358
    • 1997-11-21
    • Richard Adam CesariSivanand Simanapalli
    • Richard Adam CesariSivanand Simanapalli
    • H03M13/23H03M13/41H04L1/00G06F11/10
    • H04L1/0052H04L1/0054
    • A method of efficient branch metric computation for a Viterbi convolutional decoder wherein a reduced and optimized set of branch metrics is distributed among one or more base sets is provided. A sequence of data transformations and associations are defined according to the connections of the delay elements in the convolutional encoder to its outputs. Each encoder state is associated with one of the base sets and one of several groups of path metric equations. During the add portion of the add-compare-select phase of Viterbi decoding, a branch metric value is extracted from the base set associated with the encoder state being evaluated. The group of path metric equations associated with state being evaluated are evaluated using the extracted branch metric value. The results of the addition are then be processed according to the remaining steps of the Viterbi algorithm.
    • 提供了一种用于维特比卷积解码器的有效分支度量计算的方法,其中在一个或多个基本集合之间分布减小和优化的分支度量集合。 根据卷积编码器中的延迟元件与其输出的连接来定义数据变换和关联序列。 每个编码器状态与基本集合之一和路径度量方程的几组中的一个相关联。 在维特比解码的加法 - 比较选择阶段的添加部分期间,从与所评估的编码器状态相关联的基本集合中提取分支量度值。 使用提取的分支度量值来评估与正在评估的状态相关联的路径度量方程组。 然后根据维特比算法的剩余步骤处理相加的结果。