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基于MATLAB的通信系统仿真

专业：电子与通信工程

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数字通信大作业 目录

基于Matlab的通信系统仿真 ······························································································ 3 系统综述 ······················································································································ 3

结构框图 ··············································································································· 3 系统实现 ······················································································································ 4

随机信号的生成 ··································································································· 4 星座图映射 ··········································································································· 4 插值 ······················································································································ 6 波形成形（平方根升余弦滤波器） ····································································· 7 10倍载波调制 ······································································································ 8 加入高斯白噪声 ·································································································· 11 匹配滤波器 ········································································································· 12 采样 ···················································································································· 15 判决解调 ············································································································· 16 误码率曲线 ········································································································· 17 整体程序构架 ····································································································· 19 讨论 ···························································································································· 21

信噪比修正 ········································································································· 21 仿真曲线 ············································································································· 21 仿真终止条件 ····································································································· 22 升余弦滤波器 ····································································································· 22

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基于Matlab的通信系统仿真 基于Matlab的通信系统仿真

系统综述

利用Matlab仿真软件，完成如图1所示的一个基本的数字通信系统。信号源产生0、1等概分布的随机信号，映射到16QAM的星座图上，同时一路信号已经被分成了实部和虚部，后边的处理建立在这两路信号的基础上。实部、虚部信号分别经过平方根升余弦滤波器，再加入高斯白噪声，然后通过匹配滤波器（平方根升余弦滤波器）。最后经过采样，判决，得到0、1信号，同原信号进行比较，给出16QAM数字系统的误码。

结构框图

图1 待构建系统的框图

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