matlab在通信系统中的常用例题。其中有AMI编码的功率谱，升余弦滚降系统，最佳升余弦滚降系统及误码率，多径传播。-matlab in the communication system used in the example. Among them, the power spectrum AMI coding or cosine roll-off system, the best or cosine roll-off system and the bit error rate, multipa