(2,1,3)卷积码的编码及译码程序，封装成函数，无冗余子函数，简单易懂，运行时显示Viterbi译码全部过程-(2,1,3) convolutional code encoding and decoding process, encapsulated into a function, non-redundant Functions, easy to understand, run-time display the whole process of Viterbi decoding