使用半分析半仿真的方法进行QPSK系统仿真，分别计算在高斯信道、瑞利衰落信道、莱斯信道环境下的系统误比特率（BER）-Simulate a QPSK system(without coding), write a summary report in MS Word file containing the following items together with the necessary analysis & discussions. system diagram error per

QPSK信号在AWGN信道下的仿真,画出了发射信号与接受信号的星座图以及BER和SER随SNR变化的曲线-QPSK signal is simulated in the AWGN channel