中文说明：详细描述了pi/4dqpsk调制解调、RRC匹配滤波器设计、误码率蒙特卡罗仿真、瑞利衰落的系统仿真。文件附有每个模块的Matlab代码。
English Description：
Detailed description of pi/4 DQPSK modulation, demodulation, RRC matched filter design, BER Monte Carlo simulation, rayleigh fading of system simulation. Document attached to each module of the Matlab code.