该函数实现卷积编码 (2,1,3)卷积码的译码器，生成冲激响应分别为[1 1 1]和[1 0 1] 用维特比译码实现-This function convolution coding (2,1,3) convolutional code decoder to generate the impulse response, respectively [1] and [1 0 1] Viterbi decoding