QPSK调制的误码率与信噪比关系图，理论值与实际值的对比。-QPSK modulation the BER and SNR diagram

典型的QPSK调制系统的误码率与误比特率的仿真，并与理论曲线进行对比-Typical QPSK modulation system bit error rate and bit error rate simulation, and compared with the theoretical curve

分别编写BPSK与QPSK调制解调系统的Matlab仿真程序，要求：发送滤波器与接收滤波器均为根升余弦滚降滤波器；信道噪声为加性高斯白噪声 绘制BPSK与QPSK调制下的误码率与信噪比曲线图，并与理论曲线比较对比-They were written BPSK and QPSK modulation and demodulation system Matlab simulation program requirements: a transmission filter and a recept

基于高斯白噪声下的QPSK系统仿真，绘制误码率图，可与理论曲线对比-Based on QPSK system simulation under Gaussian white noise, the bit error rate map can be compared with the theoretical curve

瑞利信道下的QPSK误码率仿真，利用蒙特卡洛模型跟理论结果曲线对比(Rayleigh channel QPSK bit error rate simulation, the use of Monte Carlo model with the theoretical results curve comparison)