基于MATLAB的模拟调制系统仿真.

河 北 建 筑 工 程 学 院

本科生毕业设计（论文）

题

目 基于MATLAB的模拟调制系统仿真

答辩委员会主席签字：

河 北 建 筑 工 程 学 院

本科生毕业设计（论文）

题

目 基于MATLAB的模拟调制系统仿真

学 科 专 业: 建筑电气与智能化

班

级: 电智151

姓 名: 王金立

指 导 教 师: 李亚杰

指导教师职称: 讲师

Ⅰ 摘要

随着时间的发展，通信技术得到了很大的提高，能够通过模拟将我们需要的信号进行一下调制，调成能够在信道上传送的一个非常重要的技术。我们经常使用到幅度调制和角度调制来作为重要的方式。当我们用幅度调制的时候，我们会将振幅调制、双侧波带、单侧波段等方法来作为我们首要的研究对象，了解他们的原理我们再进行讲解分析讨论。而当进行到角度调制分析的话，我们往往用到频率调制还有音调来进行研究探讨，阐述一下我们了解到的调制原理，紧接着开展模拟调制研究。

我们可以用一个软件叫做MATLAB，他下面有一个工具箱叫Simulink，这个工具箱可以帮助我们到我们进行模拟调制研究分析。经过一系列工作研究我们会得到频域或者时域模拟结论，我们会清楚的得到所有调制方法的优劣，哪一个更好、哪一个有不足，我们将会更加全面地掌握模拟调制系统有关方面的一些重要东西，在了解每一种调制方法后我们再根据我们想要使用的调制方法，但是不同的调制方法往往就会有不同的系统功能，通信系统的发送端通常需要调制过程，为了将调制信号的光谱移动到期望的位置，并将调制信号频谱转换为适合信道传输或方便信道复用的调制信号，在接收端为了恢复本来的有用信号而进行解调过程必要。调制解调方案通常确定通信系统的性能。随着信息化时代的到来，调制解调技术成为当今社会极其重要的学科和技术领域，广泛应用于通信、信号处理等多个领域。在调制解调系统中担当者主角地位的应当归属调制解调器啦，数字通信技术中没有调制解调器是万万不可以的，这使得调制解调器大面积投入到大中小型工厂和个人研究所中。

关键词：MATLAB；模拟调制；仿真；Simulink

Ⅱ Abstract

With the development of time, communication technology has been

greatly improved. We can modulate the signal we need through simulation to a

very important technology that can transmit on the channel. Amplitude

modulation and angle modulation are often used as important methods. When

we use amplitude modulation, we will take the methods of amplitude

modulation, bilateral band and unilateral band as our primary research object.

We will explain and discuss their principles. When we do angular modulation

analysis, we often use frequency modulation and tone to study and discuss,

elaborate the modulation principle we know, and then carry out analog

modulation research.

We can use a software called MATLAB, which has a toolbox called

Simulink below. This toolbox can help us to carry out analog modulation

research and analysis. After a series of work research, we will get the

conclusion of frequency domain or time domain simulation. We will clearly get

the advantages and disadvantages of all modulation methods, which one is

better and which one is insufficient. We will have a more comprehensive grasp

of some important aspects of analog modulation system. After understanding

each modulation method, we will use the modulation method we want to use,

but not. The same modulation method often has different system functions.

The transmitter of communication system usually needs a modulation process.

In order to move the spectrum of the modulated signal to the desired position

and convert the spectrum of the modulated signal into a modulated signal

suitable for channel transmission or convenient for channel multiplexing, it is

necessary for the receiver to carry out the demodulation process in order to

recover the original useful signal. Modem schemes usually determine the

performance of communication systems. With the advent of the information

age, modem technology has become an extremely important subject and

technical field in today's society, which is widely used in communication, signal

processing and other fields. In the modem system, the leading role should

belong to the modem. It is absolutely impossible without the modem in digital

communication technology, which makes the modem invest in large and

medium-sized factories and personal research institutes.

Ⅱ Key words: Analog modulation; simulation; Simulink

目录

目录

第1章 绪论 ............................................................................................................................................ 1

1.1引言 ........................................................................................................................................... 1

1.2 研究背景 .................................................................................................................................. 1

1.3 关键技术 ................................................................................................................................ 2

1.3.1 调制 ............................................................................................................................. 2

1.3.2 解调 ............................................................................................................................. 2

1.4 研究目的及意义 .................................................................................................................... 3

1.5 本文工作及内容安排 ............................................................................................................ 4

第2章MATLAB简介 ................................................................................................................................ 5

2.1 什么是MATLAB： ..................................................................................................................... 5