Viterbi解码器Matlab版.生成输入、输出表、状态转移表，沿Trellis进行剪枝，记录保留路径，最后返回并得到最终解码。-Matlab version of Viterbi decoder. Generate input, output tables, state transition table, along the Trellis for pruning, record succeed path, finally trace back and get eventually deco