通信原理实验3报告new

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1、1.基于Matlab/Simulink的QDPSK通信系统仿真图如下：图2基于Matlab/Simulink的QDPSK通信系统仿真图2.绘制信噪比与误码率关系曲线程序如下：figure(1)x=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];y=[0.2773,0.2344,0.2148,0.168,0.1445,0.1016,0.08203,0.05859,0.02344,0.01953,0.01172,0.003908,0.003906,0.003906,0.003906,0.00390

2、6,0.003906,0.003906,0.003906,0.003906];plot(x,y),title('误码率');图3QDPSK调制输出信号波形图图4经高斯信道后的QDPSK信号波形图（SNR为20dB）图5QDPSK调制输出信号星座图图6经高斯信道后的QDPSK信号星座图（SNR为20dB）图7眼图图8QDPSK系统信噪比与误码率关系曲线图