BCJR算法，解决卷积编码的译码问题，软入软出，可以为后续程序提供软值信息，程序可以直接运行，有详细注释-BCJR algorithm to solve the problem of convolution coding decoding, soft-in soft-out, can provide soft value information for follow-up procedures, the program can be run directly, there are detaile