用matlab实现DQPSK的调制解调，并绘制BER曲线-Using matlab to achieve DQPSK modulation and demodulation, and draw the BER curves

π/4-DQPSK的Matlab调制解调仿真程序，通过在Ka频段的仿真得出不同天气情况下此调制方式的受影响情况-π/4- DQPSK Matlab modem simulation program, through the simulation in Ka band at the different weather condition the modulation mode affected situation