中文说明：
设计了差分编码移相键控(2DPSK)调制解调系统的工作流程图，并利用 Matlab 软件对该系统的动态进行了模拟仿真。利用仿真的结果,从基带信号的波形图可以衡量数字信号的传输质量 由系统的输入和输出波形图可以看出,仿真实验良好。
English Description：
The working flow chart of differential coding phase shift keying (2DPSK) modulation and demodulation system is designed, and the dynamics of the system is simulated by MATLAB software. Using the simulation results, the transmission quality of digital signal can be measured from the waveform of baseband signal. It can be seen from the input and output waveform of the system that the simulation experiment is good