毕业论文摘要

安徽工程大学毕业设计（论文）

基于MATLAB的数字解调的仿真与实现

摘要

在数字通信中数字解调技术是其中非常重要的技术之一。发送端把信息加到载波

上，变成己调信号的过程称调制，在接收端用解调器从已调信号中恢复成原信息，这个

过程称解调。为使数字信号能在带通信道中传输，必须用数字基带信号对载波进行数字

调制。因数字基带信号对载波参数的调制通常采用数字信号的离散值对载波进行键控，

故有四种数字调制方式被称为幅移键控（ASK）、频移键控（FSK）、相移键控（PSK）

和差分相移键控（DPSK）。本文介绍了 2ASK、2FSK、2PSK 的解调方法以及各方法

的工作原理，利用 Matlab 软件建立仿真模型，从理论上解释 2ASK、2FSK、2PSK 的

解调原理。仿真部分都是利用 Simulink 软件并采用相干解调的方法，进行仿真分析并

使输出结果达到最好效果。本文的主要目的是通过此次的解调仿真，使我们对 2ASK、

2FSK、2PSK 解调的工作原理以及 Simulink 软件有了比较深刻的理解和掌握。

关键词：抗菌拒水；反应条件；工艺参数；性能检测

Simulation and implementation of digital demodulation based

on MATLAB

Abstract

刘海：棉织物的抗菌拒水及工艺整理探究

Simulation and Implementation of Digital Demodulation Based on the MATLAB ABSTRCAT

Digital demodulation is one of the important technologies in digital communication technology. Transmitter modulation is a process which added to the information carrier， has been transferred into the signal， Demodulation is a process which used in the receiver demodulator to recover from the modulated signal into the original information. To enable digital signal to the band communications channels of transmission must be digital baseband signals to digital modulation on the carrier. Digital baseband signal due to carrier modulation parameters are usually discrete values of digital signals for keying of the carrier， so there are four types of digital modulation. There are Amplitude shift keying(ASK)、Frequency shift keying(FSK)、Phase shift keying(PSK). In this paper， it introduces the demodulation principle of 2ASK， 2FSK and 2PSK ， and it establishes the simulation model to explain the demodulation principle of 2ASK， 2FSK and 2PSK with Matlab software. The Simulation uses coherent demodulation to achieve the best results with Simulink software. The main purpose of the demodulator is that we can have a relatively deep knowledge and understanding the principle of 2 ASK， 2FSK， 2PSK demodulator and Simulink software through this simulation. Keyword： 2ASK；2FSK；2PSK；coherent demodulation，；Simulink simulation

引言.................................................................1

第1章绪论...........................................................2

1.1通信技术的发展........................................................2

1.2Matlab和simulink的简介...............................................2

1.3主要研究内容..........................................................4

安徽工程大学毕业设计（论文）

第2章 2ASK、2FSK、2PSK的解调原理......................................10

2.1二进制振幅键控（2ASK）...............................................10

2.2二进制频移键控（2FSK）...............................................11

2.3二进制相移键控（2PSK）...............................................11

2.4本章实验小结.........................................................12

第3章 MATLAB的模型建立和仿真.........................................13

3.1 2ASK仿真.............................................................13

3.1.2调制仿真.........................................................14

3.1.3解调仿真.........................................................14

3.2 2FSK仿真.............................................................13

3.2.2调制仿真.........................................................14

3.2.3解调仿真.........................................................14

3.3 2PSK仿真.............................................................13

3.3.2调制仿真.........................................................14

3.3.3解调仿真.........................................................14

3.4实验小结.............................................................16

结论与展望..............................................................17

致谢................................................................18

参考文献................................................................19 附录A

附录B

附录C

III

刘海：棉织物的抗菌拒水及工艺整理探究

表格清单

表2-1试剂等级和生产厂商..................................................10

表2-2仪器型号和生产厂家..................................................10

表3-1 仪器型号和生产厂家.................................................13

表3-2 实验的主要材料.....................................................14

表3-5 抗菌实验数据统计...................................................14

表4-3 拒水效果统计.......................................................15