瑞利衰落信道下，DQPSK误码率性能仿真,Rayleigh fading channels, DQPSK BER performance simulation

This m file draw the BER curve of the differential QPSK over the AWGN channel.

Simple Series Form Formula of BER Performance for DQPSK/OFDM Signals in Comprehensive Nonlinear Fading Channels

本代码主要通过pi/4 DQPSK，经过AWGN信道，可以对比不同offset下BER的变化。主程序请点击BER_Figure。-This code mainly by pi/4 DQPSK, through AWGN channel, you can compare different offset changes under the BER. Click on the main BER_Figure.