软件无线电台中QPSK调制解调的算法与仿真.doc

学号:3042003116

中国人民解放军体育学院
毕业论文
软件无线电中QPSK调制解调的
算法与仿真
THE REALIZE OF ALGORITHM AND EMULATION ABOUT MODULATOR AND DEMODULATOR ON QPSK IN SOFTWARE DEFINED READIO
姓名钟颖浩
专业通信工程
指导教员王进
2006年12 月15 日
软件无线电中QPSK调制解调的算法与仿真
摘要:软件无线电是一种全新的无线电通信体系结构,其基本思想是把硬件作为无线通信的基本平台,而把尽可能多的无线通信功能用软件来实现。随着半导体和微电子技术的发展,在中频完成全数字化解调已成为可能。本文就是对70 MHz的中频QPSK 信号进行直接带通采样,然后送入已写入载波同步算法和定时同步算法的FPGA中,从而完成对QPSK信号的全数字化解调,由于采用了可动态配置的FPGA来实现QPSK信号的解调,因此只需通过软件对其参数进行适当的设置,就可以完成对多种数据传输率、多种中频载波的QPSK信号的解调。
关键词:软件无线电,QPSK解调,载波同步,定时同步,数字锁相环,MATLAB仿真
THE REALIZE OF ALGORITHM AND EMULATION ABOUT MODULATOR AND DEMODULATOR ON QPSK IN SOFTWARE DEFINED READIO
Abstract:Software defined radio is a kind of new munication system structure,the main principle was using the hardware as a basic platform of munication,implement function of the munication using software. In the paper,direct band pass sampling was used to QPSK signal with 70 MHz IF,plete demodulation with FPGA which has carrier recovery and timing synchronization algorithms,using reconfigurable device. You can demodulate multi-rate & multi-IF-Carrier after you change some parameter properly. Keywords:QPSK demodulation,carrier recovery,timing synchronization,DPLL,MATLAB simulink
Key words:software defined radio,QPSK demodulation,carrier recovery,timing synchronization,DPLL,MATLAB simulink
目录
1 前言............................................................4
2 软件无线电......................................................4
软件无线电的种类..........................................4
软件无线电的概念.........................................5
软件无线电的特点..........................................5
3 数字锁相环的特性与结构..........................................6
4 QPSK载波恢复环的实现............................................6
鉴相误差的提取............................................7
鉴相增益的计算............................................7
环路滤波器的参数设置......................................8
5 QPSK定时同步实现................................................9
Matlab仿