毕业设计QPSK调制与解调的软件实现.doc

QPSK调制与解调的软件实现 摘要：随着移动通信技术的发展，以前在数字蜂窝系统中采用FSK、ASK、PSK等调制方式，逐渐被许多优秀的调制技术所替代，其中四相移相键控QPSK技术是无线通信技术中比较突出的一种二进制调制方法。本文主要介绍了QPSK调制与解调的实现原理框图，重点研究了用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，得到了信号在QPSK调制与解调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：数字蜂窝系统， 四相移相键控，调制，解调。 QPSK modulation and demodulation of software implementation Abstract：As mobile communications technology, and previously in the adoption of digital cellular system, ASK, FSK PSK modulation, etc. Gradually been many excellent modulation technology substitution, where four phase-shift keying QPSK technology is a wireless communications technology in a binary modulation method. This article primarily describes QPSK modulation and demodulation of the implementation of the principle 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 demodulation adjustment process domain change figure. The software implementation, can dramatically improve the design flexibility, saving design time, increase efficiency, design to reduce the workload of hardware circuit design, and shorten the development cycle. Key words：Digital cellular system, QPSK, modulation, demodulation. 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc262654828 第一章 绪论 PAGEREF _Toc262654828 \h 1 HYPERLINK \l _Toc262654829 1.1 选题的目的与意义 PAGEREF _Toc262654829 \h 1 HYPERLINK \l _Toc262654830 1.2 研究背景与现状 PAGEREF _Toc262654830 \h 1 HYPERLINK \l _Toc262654831 1.3 数字调制解调技术的概述 PAGEREF _Toc262654831 \h 2 HYPERLINK \l _Toc262654832 1.4 QPSK技术的概述 PAGEREF _Toc262654832 \h 3 HYPERLINK \l _Toc262654833 1.5 本文的主要研究工作 PAGEREF _Toc262654833 \h 4 HYPERLINK \l _Toc262654834 第二章 QPSK调制解调原理及结构设计 PAGEREF _Toc262654834 \h 5 HYPERLINK \l _Toc262654835 2.1相移键控系统概述 PAGEREF _Toc262654835 \h 5 HYPERLINK \l _Toc262