文档介绍：毕业论文
目录
摘要 III
Abstract V
第一章绪论 1
引言 1
OFDM的提出和发展 2
第二章 OFDM原理 5
引言 5
多载波调制 5
并行传输体制概述 9
OFDM基本原理 10
OFDM系统性能特点 13
本章小结 14
第三章基于OFDM的无线局域网 17
引言 17
物理层结构 17
OFDM PLCP子层 18
仿真分析 21
SystemView软件简介 21
无线局域网的实现框图 22
采用SystemView进行仿真分析。 22
本章小结 24
第四章总结与展望 25
致谢 27
参考文献 29
正交频分复用OFDM技术的研究
摘要
OFDM (Orthogonal Frequency Division Multiplexing)即正交频分复用,是一种特殊的多载波调制技术。OFDM全称为正交频分复用(Orthogonal Frequency Division Multiplexing),是一种新型的高效的多载波调制技术,它能够有效地对抗多径传播,使受到干扰的信号能够可靠地接收。经过几十年的开发之后,OFDM/COFDM不但被广泛地应用于高速数字通信中,而且已扩展到其他领域。同时现代数字信号处理技术和超大规模专用集成电路(VLSI)的发展也使得快速傅立叶变换的实现变的更加容易,使该技术的实现费用更趋实际,为以后OFDM广泛应用于通信领域开辟了道路。
论文首先研究了OFDM理论,重点分析了在频率选择性衰落信道中OFDM技术解决码间干扰问题的原理;总结分析了基于OFDM的无线局域网,利用System View对基于OFDM无线局域网系统进行了仿真,并对可能影响结果的信噪比、调制映射和信道进行了分析,结果符合预期。
关键词: 正交频分复用,多载波调制,信噪比,调制映射
The research of the Orthogonal Frequency Division Multiplexing OFDM technology
Abstract
OFDM (Orthogonal Frequency Division Multiplexing) that is Orthogonal Frequency Division Multiplexing, is a special multi-carrier modulation technique. OFDM full name Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing), is a new type of highly efficient multi-carrier modulation technique, it can effectively fight against multi-munication, so that the signal interference can reliably receive. After several decades of development after, OFDM / COFDM has been widely used in high-speed munications, and has spread to other areas. At the same time modern digital signal processing technology and ultra-large-scale application specific integrated circuits (VLSI) also makes the development of the fast Fourier transform to achieve change more easily so that the cost of the technology to achieve more practical, for the future OFDM widely used in the field munication open The road.
At the first the Papers Research the OFDM theory, and on the focus of the frequency selective fading channel OFDM technology to