中文说明：
dbpsk信号的调制解调matlab代码实现的一个例子，调制时差分编码，这样用1bit延迟差分检测的结果，直接就是原码，解调采用1bit差分延迟检测。
English Description：
DBPSK modulation signal demodulation matlab code implementation of a example, difference coding modulation, so with the testing results of the 1 bit delay difference, is the original code directly, demodulation using 1 bit difference delay detection.