说明：  2DPSK 调制与解调 包括参数初始化、信号初始化、求差分编码、产生基带信号、调制部分、相干解调、低通滤波部分、抽样判决 & 逆码变换部分、序列生成与差分还原。事实上这个程序不是我写的，是一个朋友下载了这个程序但是运行不了，我帮他改了其中的一些内容使之能够运行。
(2DPSK modulation and demodulation It includes parameter initialization, signal initialization, differential coding, baseband signal generation, modulation, coherent demodulation, low-pass filtering, sampling decision and inverse code conversion, sequence generation and differential reduction. In fact, this program was not written by me. It was a friend who downloaded the program, but it couldn't work. I helped him change some of it so that it could run.)