文档介绍：毕业设计(论文)
基于MSK调制的通信系统性能分析
系别
电子信息系
专业名称
通信工程
班级学号
学生姓名
指导教师
2012年6月10日
基于MSK调制的通信系统性能分析
摘要
最小频移键控(Minimum Shift Keying,MSK)是一种具有连续相位和最小频偏的数字调制技术。MSK的突出优点是信号具有恒定的包络和信号的相位连续性,频带利用率高,信号的功率谱在主瓣外衰减较快,这就使得它对邻波道干扰小。由于包络恒定、MSK信号不受信道的非线性影响等特点,使其在卫星通信和移动通信中得到了广泛的应用。因此,对MSK通信系统的研究有着显著的意义,也为未来深入研究通信领域的先进数字调制解调技术奠定基础。
本文阐述了MSK调制的国内外研究现状,分析了MSK调制技术的基本原理,对几种基本调制方法及其优缺点进行了比较。在此基础之上,构建基于MATLAB的MSK通信系统模型:信源、调制、信道、解调和信宿。并对调制、解调、高斯白噪声进行数学建模和流程图设计,最后得到各部分的仿真结果。最后分析了MSK已调信号时域和频域特征,评估验证其频率利用率并对基于MSK调制的通信系统在噪声信道的误码率进行仿真,得到其在噪声中的适应能力。
通过仿真分析证实了其频带利用率高的特点。调制方案采用数字式调制的方法,直接根据MSK信号的时域表达式和相位图进行数字式调制;解调方案采用功率估计比较来进行判决并译码,然后得到解调信号码元序列。
最后在本文的结论中,对基于MSK调制的通信系统性能进行了总结,并对今后MSK调制方面的研究工作进行了展望。
关键词:最小频移键控,软件仿真,误码率,频带利用率
MSK modulation munication system performance analysis
Author: Huang Zhanjun
Tutor: Liu Fulai
Abstract
MSK (Minimum Shift Keying) is a continuous phase and the minimum deviation of the digital modulation techniques. Outstanding advantage of MSK signals have constant envelope and continuous phase signals, high bandwidth efficiency and the signal power spectrum decreases rapidly outside the main lobe, this makes it a small adjacent channel interference. As a constant envelope and MSK signal is not the impact of the nonlinear channel characteristics, to the satellite and munications have been widely used in. Thus, munication system has significant meaning; also it laid the foundation for the future in-depth study of advanced munications modem technology.
This paper introduces the development of MSK modulation, analysis of the basic principle of MSK modulation technology. On several basic modulation methods and their advantages and disadvantages pared. On this basis, is constructed based on the MATLAB munication system model: source, modulation, demodulation, channel and destination. And the modulation, demodulation, Gauss white noise to mathematical modeling and flowchart design, finally get the part of the simulation results. The final analysis of the MSK modulated s