课程设计（论文）-基于MATLAB的FM调制与解调通信仿真.doc

基于MATLAB的FM调制与解调通信仿真
摘要
FM在通信系统中的使用非常广泛。FM广泛应用于高保真音乐广播、网络伴音信号的传输、卫星通信和蜂窝电话系统等。
本设计主要是利用MATLAB集成环境下的M文件,编写程序来实现FM调制与解调过程,并分别绘制出基带信号,载波信号,已调信号的时域波形;再进一步分别绘制出对已调信号叠加噪声后信号,相干解调后信号和解调基带信号的时域波形;最后绘出FM基带信号通过上述信道和调制解调系统后的误码率与信噪比的关系,并通过与理论结果波形对比,来分析该仿真调制与解调系统的正确性及噪声对信号解调的影响。在本设计中,系统开发平台为Windows Vista,使用工具软件为MATLAB 。在该平台运行程序完成了对FM调制和解调以及对叠加噪声后解调结果的观察。通过本设计,达到了实现FM信号通过噪声信道,调制和解调系统的仿真目的。
关键词 FM;调制;解调;MATLAB ;噪声
Abstract
FM in the use munication system is very extensive. FM widely applied in hi-fi music radio, TV sound signal transmission, munications and cellular phone system, etc.
This design is mainly use of MATLAB integration environment, programming of the M files to realize FM modulation and demodulation process and draw the baseband signal respectively, carrier signal, has adjustable signal temporal profile; Further to map out already tuning respectively after adding noise signal, coherent demodulation signal after the baseband signal demodulation signal and time domain waveform; Finally draw FM baseband signal through the channel and demodulation system ber and signal-to-noise ratio, and through the relationship with this theory, this paper analyzes the wave contrast this simulation modulation and demodulation system accuracy and noise on the influence of signal demodulation. In this design, system developing platform for Windows Vista, using tools software for MATLAB . On this platform to run the pleted and the FM modulation and demodulation after adding noise results observation. Demodulating Through this design, to realize FM signals through the noise channel, modulation and demodulation system simulation purpose.
Key words FM; Modulation; Demodulation; MATLAB ; noise
目录
前言……………………………………………………….4
1、毕业设计的目的与要求…………………………….4
毕业设计的目的……………………………..4
毕业设计的要求………………………………4
2、FM调制解调系统设立………………………………4
、FM调制模型的建立…………………………….6
、调制过程分析…………………………………..6
、FM解调模型的建立…………………………….7
、解调过程分析…………………………………..8
、高斯白噪声信道特性…………………………..9
、调