(2,1,2)卷积编码及译码过程示例代码，有说明-(2,1,2) convolutional encoding and viterbi decoding demo codes, with instructions.

QPSK调制下的（5,7）卷积码的编码和维特比译码与BPSK调制下（5,7）卷积码的编码和维特比译码的BER特性-QPSK modulation under (5,7) convolutional code encoding and Viterbi decoding and BPSK modulation (5,7) convolutional code encoding and Viterbi BER characteristic