(2,1,2)卷积码链路仿真,采用viterbi译码算法,采用m语言编写,并非直接调用matlab内部函数,有助于对viterbi译码算法的理解-(2,1,2) convolutional code link simulation using viterbi decoding algorithm using m language, not directly call matlab internal function, contribute to the understanding of viterbi decoding algorithm