中文说明：用MATLAB设计一简单的通信系统，要求采用PCM编译码，基带信号用HDB3码，信道编译码采用循环码，调制方式为PSK，信道为衰落信道故采用数字通信系统
English Description：
Using MATLAB to design a simple communication system, called for PCM encoding and decoding, base-band signal using HDB3 coding, channel coding using cyclic codes, PSK modulation, the channel for fading channels using digital communication system