通信原理实验报告（三）

学院：计算机科学与信息学院        专业： 网络工程           班级：网络092

注：各学院可根据教学需要对以上栏木进行增减。表格内容可根据内容扩充。

 

第二篇：通信原理实验3报告

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=[0.2773,0.2344,0.2148,0.168,0.1445,0.1016,0.08203,0.05859,0.02344,0.01953,0.01172,0.003908,0.003906,0.003906,0.003906,0.003906,0.003906,0.003906,0.003906,0.003906];

plot(x,y),title('误码率');

图3 QDPSK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5 QDPSK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8 QDPSK系统信噪比与误码率关系曲线图