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通信工程专业设计说明书

基于Matlab/Simulink 的2FSK调制解调仿真设计与研究

目录

摘 要 ··························································································· 3 第一章 前 言 ··············································································· 4 1.1 专业设计任务及要求 ··································································· 4 1.2 MATLAB简介 ············································································ 4 1.3 MATLAB下的SIMULINK简介 ························································· 4 1.4 通信系统模型 ··········································································· 5 第二章 FSK调制解调原理及MATLAB仿真 ················································ 6 2.1 FSK信号产生原理 ······································································ 6 2.1.1 2FSK信号的产生： ································································ 6 2.1.2 2FSK信号的频谱特性： ·························································· 7 2.2 FSK调制原理 ············································································ 7 2.3 FSK解调原理 ············································································ 9 2.4仿真思路 ·················································································· 9 2.5 仿真程序 ················································································· 10 2.6 输出波形及结果分析 ·································································· 12 结果分析 ························································································· 17 第三章 用SIMULINK仿真FSK调制解调 ················································ 18 3.1 用SIMULINK仿真FSK调制 ························································· 18 3.1.1 Simulink仿真FSK调制框图 ···················································· 18 3.1.2参数设置 ············································································· 18 3.1.3仿真波形 ············································································· 19 3.2 用SIMULINK仿真FSK解调 ························································· 21 3.2.1 Simulink仿真FSK解调框图 ················································· 21 3.2.2参数设置 ··········································································· 21 3.2.3仿真波形及分析 ·································································· 23 第五章 结论 ···················································································· 25 参考文献 ························································································· 26

摘 要

本设计是基于MATLAB来实现调制与解调的仿真。主要设计思想是利用MATLAB和MATLAB集成环境下Simulink的仿真平台，这个强大的数学软件工具方便快捷灵活的功能实现数字调制解调中的频率调制与解调的设计。

首先，先阐述了通信系统的模型，以及FSK信号的产生原理，调制与解调的基本原理。然后分别设计了FSK调制框图和解调框图，实现了Matlab程序仿真和Simulink系统仿真，在解调部分各信号都是采用相干解调、非相干解调的方法，同时在没有噪声的情况下和存在噪声的基础上分别对信号进行调制与解调，并且在解调的过程中都对整个系统的误码率在display模块中有所显示，得到了比较准确的结果，进而在存在噪声和不存在噪声时进行对比，对结果进行了详尽而且准确的分析。

最后给出了一些结论：信道中的噪声大小严重影响通信质量。在通信中，要保证通信质量高，必须信道信噪比要高。在低信噪比信道中，必须想其它办法克服，如信道编码等。FSK（Frequency-shift keying）是信息传输中使用得较早的一种调制方式,它的主要优点是: 实现起来较容易,抗噪声与抗衰减的性能较好。在中低速数据传输中得到了广泛的应用。