System and method for decoding tail-biting code especially applicable to
digital cellular base stations and mobile units
    1.
    发明授权
    System and method for decoding tail-biting code especially applicable to digital cellular base stations and mobile units 失效
    用于解码尾码的系统和方法,特别适用于数字蜂窝基站和移动单元

    公开(公告)号:US5369671A

    公开(公告)日:1994-11-29

    申请号:US889054

    申请日:1992-05-20

    CPC分类号: H03M13/4123 H03M13/23

    摘要: A digital cellular system (10) employs a decoder that decodes control messages encoded by a convolutional tail-biting encoding procedure. The control messages (57) contain 65 bits that are encoded in a 260 bit data frame (59). The decoder reads (112) the first x quadruple bits and writes them also at the end of the data frame bit stream. A Viterbi decoding algorithm (114) is applied to the modified bit stream for x plus 65 steps. A bit stream of (65+x) bits is selected (116) from a best value path and y first bits are discarded from the selected stream. The output decoded message (118) includes bits (y+1) through (y+65).

    摘要翻译: 数字蜂窝系统(10)使用解码器,其解码由卷积尾巴编码过程编码的控制消息。 控制消息(57)包含编码在260位数据帧(59)中的65位。 解码器读取(112)第一x个四位,并将其写入数据帧位流的末尾。 维特比解码算法(114)被应用于修改的比特流用于x加65步。 从最佳值路径选择(65 + x)比特的比特流(116),并且从所选择的流中丢弃y个第一比特。 输出解码消息(118)包括位(y + 1)至(y + 65)。