摘要:本文结合学过的信息专业的基本知识和基本技能,根据教学内容中的各种数字调制框架,针对数字调制系统中几种常见的调制方式,基于MATLAB软件对其进行仿真。在本文中以BFSK信号为例,建立了高斯白噪声信道和瑞利衰落信道的数学模型,并用MATLAB进行仿真,对该信号在这两个信道中的性能进行了仿真对比,收集了对应的信噪比和误码率,得出了BFSK信号在高斯白噪声信道中的误比特率低于瑞利衰落信道的结论,本文还进行了QPSK的相关仿真,通过总结数字调制的基本原理,成功完成对数字调制信号在传输信道中的传输性能的仿真。71020
毕业论文关键字: MATLAB;数字调制;仿真与分析; PSK;BFSK
Simulation of digital modulation performance based on MATLAB
Abstract: This paper combines the basic knowledge and basic skills of the information specialty, and simulates the digital modulation based on MATLAB software. In this paper, the mathematical model of Gaussian white noise channel and Rayleigh fading channel is established by taking BFSK signal as an example, and the performance of the signal in these two channels is simulated and compared, and the error rate of the signal in Gaussian white noise channel is lower than the Rayleigh fading channel. By summarizing the basic principle of digital modulation, the simulation of transmission performance of digital modulation signal in transmission channel is accomplished successfully.
KeyWords: MATLAB,;Digital modulation; Simulation and analysis,BFSK
目录
1 绪论 2
1.1 课题的目的和意义 2
1.2 现状与发展趋势 2
1.3 课题的基本内容 3
2 数字调制技术 3
2.1 二进制频移键控(2FSK) 3
2.1.1 FSK的基本原理 3
2.1.2 FSK的调制 4
2.1.3 FSK的解调 4
2.2 二进制相移键控(2PSK) 5
2.2.1 PSK的基本原理 5
2.2.2 PSK的调制 5
2.2.3 PSK的解调 6
2.3 MATLAB 6
2.3.1 MATLAB的介绍 6
2.3.2 MATLAB的编程仿真 7
2.4 SIMULINK模块 7
3 数字调制系统仿真的编程与建模 9
3.1 信道 9
3.2 高斯白噪声信道的建模与编程 9
3.2.1 高斯白噪声信道的基本内容 9
3.2.2