说明：  本程序是卷积码的viterbi译码，卷积码的编码结构图已经附在程序打包中，本卷积码是循环递归卷积码，最后状态不容易回零，本程序最后有判决程序，记录回零状态！反向译码！本程序可以直接生成节点的树图，便于纠错，检错！
(This program is viterbi decoding convolutional codes, convolutional codes have been attached to the coding structure packaged in a loop of the recursive convolutional code convolutional code, the final state is not easy to zero, the last a decision procedure of this program, records back to the zero state! Reverse decoding! This program can generate tree nodes, to facilitate error correction, error detection!)