基于MATLAB的QPSK通信系统仿真设计

摘 要

随着移动通信技术的发展，以前在数字通信系统中采用FSK、ASK、PSK

等调制方式，逐渐被许多优秀的调制技术所替代。本文主要介绍了QPSK调制与

解调的实现原理框图，用MATLAB软件中的SIMULINK仿真功能对QPSK调制

与解调这一过程如何建立仿真模型，通过对仿真模型的运行，得到信号在QPSK

调制与解调过程中的信号时域变化图。通过该软件实现方式，可以大大提高设

计的灵活性，节约设计时间，提高设计效率，从而缩小硬件电路设计的工作

量，缩短开发周期。

关键词 QPSK，数字通信，调制，解调，SIMULINK

Abstract

As mobile communications technology, and previously in the adoption of digital

cellular system, ASK, FSK PSK modulation, etc. Gradually been many excellent mod

ulation technology substitution, where four phase-shift keying QPSK technology is a

wireless communications technology in a binary modulation method. This article prim

arily describes QPSK modulation and demodulation of the implementation of the prin

ciple of block diagrams, focuses on the MATLAB SIMULINK software emulation in

on QPSK modulation and demodulation the process how to build a simulation model,

through the operation of simulation model, I get signal in QPSK modulation and dem

odulation adjustment process domain change figure. The software implementation, ca

n dramatically improve the design flexibility, saving design time, increase efficiency,

design to reduce the workload of hardware circuit design, and shorten the developmen

t cycle.

Keywords QPSK, Digital Communication,modulation,demodulation,SIMULINK

目 录

摘 要 ............................................................................................................................... I

Abstract ......................................................................................................................... II

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

1.1 选题的目的和意义 ......................................................................................... 1

1.2 课题研究现状 ................................................................................................. 1

1.3 本文主要研究工作 ......................................................................................... 2

第 2 章 数字通信技术简介 .......................................................................................... 3

2.1 引言 ................................................................................................................. 3

2.2 概念及其基本组成部分 ................................................................................. 3

2.3 数字通信的特点 ............................................................................................ 5

2.4 数字通信发展的回顾与展望 ......................................................................... 5

本章小结 ................................................................................................................ 6

第3 章 数字相位调制 .................................................................................................. 7

3.1 数字基带传输系统 ......................................................................................... 7

3.2 正弦载波数字调制系统 ................................................................................ 8

3.3 QPSK概述...................................................................................................... 9

3.4 QPSK调制和解调........................................................................................ 10

3.4.1调制 ..................................................................................................... 10

3.4.2解调 ..................................................................................................... 10

3.4.3QPSK的调制原理............................................................................... 11

3.4.4QPSK解调的工作原理....................................................................... 13

本章小结 .............................................................................................................. 14

第4章 QPSK调制与解调的软件实现 ..................................................................... 15

4.1 SIMULINK功能介绍 .................................................................................. 15

4.2 SIMULINK特点 .......................................................................................... 15

4.3 QPSK调制与解调的软件设计.................................................................... 16

4.3.1QPSK调制与解调的软件实现........................................................... 16

4.3.2QPSK调制解调过程主要组件的功能............................................... 17

4.4 QPSK调制解调仿真过程及其波形图........................................................ 19

4.4.1QPSK调制过程及其波形图............................................................... 19

4.4.2QPSK解调过程及其波形图............................................................... 29

4.5 QPSK调制解调仿真过程正确性的验证.................................................... 34

本章小结 .............................................................................................................. 35

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