文档介绍：摘要
通信系统的设计、实验过程中,通信信号仿真具有灵活性好、经济等诸多优点,为通信系统研究工作带来了极大的方便。本通信仿真平台的任务是对调幅、双边带、单边带、调频、调相五种模拟通信信号的调制和解调进行建模和计算,以及对2ASK,2FSK,2PSK,2DPSK四种数字通信信号的调制和解调进行建模和计算。该仿真平台实现了不同设计参数下各个信号的时域和频域图形的绘制,从而很好的为教学提供了帮助。通信仿真充分考虑了调制样式和噪声大小以及在调制过程中的各种参数对通信信号性能的影响,完成了对模拟以及数字信号建模计算,得到了时域波形和频谱,能够直观的显示各种参数对各种调制样式的通信的影响。
本文做了以下工作:以MATLAB为工具,主要应用MATLAB中的GUI(图形用户接口)程序设计,设计实现了一个通信平台,能模拟九种调制信号的产生,传输以及解调接收,实现了在平台上进行参数输入和图形输出的交互功能。
关键词:调制;解调;仿真;MATLAB;GUI
Abstract
In the design and test of munication system, communicating signal simulation possesses many advantages, such as good flexibilities, economy . And it takes great convenience to the research munication system. The target of munication system flat is modeling and calculating to modulation and demodulation of five kinds of signals: AM,DSB,SSB,FM, task of munication simulation platform for modeling and calculation of 2ASK, 2FSK, 2PSK, 2DPSK four munications signal modulation and demodulation. The simulation platform realized the drawing of time domain graphics and frequency domain graphics to the different design parameters of each signal .Communicating simulation considers the effects of modulation mode, noise level and modulating parameters munication, modeling calculation, creation of the four time periods waveform and spectrum deeply and widely. It’s convenient to display intuitionisticly the effects of parameters to modulation modes.
This paper made the following job: by using MATLAB, mainly using the tool of the MATLAB graphical user interface (GUI) program design, designed munication platform, which can simulate the eight kinds of modulation signal’s generation, transmission and demodulation and realized the input of the parameters and the output of the graphics.
Keywords: modulation; demodulation ; simulation; MATLAB; GUI
目录
1 绪论 1
2 模拟通信系统基础理论 3
模拟通信系统概述 3
模拟通信系统中的线性调制 4
普通幅度调制(AM) 4
双边带幅度调制(DSB) 8
单边带调制(SSB) 10
模拟通信系统中的非线性调制 13
频率调制(FM) 13
相位调制(PM) 16
3 数字通信系统基础理论