说明：  卷积码译码算法改进 实现Conv (2,1,9)的编码,软判决滑动窗维特比译码,其生成多项式为G0 561(八进制),G1 753
(The decoding algorithm of convolutional code is improved to realize the coding of Conv (2,1,1, 9), and the soft decision sliding window Viterbi decoding is implemented. Its generating polynomial is G0.561 (octal), G7553.)