基于matlab的ofdm系统仿真.doc

精品文档 知识共享 本科毕业设计 （） 题 目 基于matlab的ofdm系统仿真 学 院 专 业 班 级 学 号 学生姓名 指导教师 完成日期 摘 要 正交频分复用(OFDM, Orthogonal Frequency Division Multiplexing) 是一种特殊的多载波方案,它可以被看作一种调制技术,也可以被当作是一种复用技术?选择OFDM的一个主要原因在于该系统能够很好地对抗频率选择性衰落或窄带干扰?OFDM 由于其频谱利用率高,成本低等原因越来越受到人们的关注? 本次毕业设计是利用MATLAB对OFDM进行仿真?仿真实验是掌握系统性能的一种有效手段,它通过对仿真模型的实验结果来确定(或推断)实际系统的性能,从而为新系统的建立或原系统的改造提供可靠的参考? 论文介绍了OFDM技术的研究意义和背景及发展趋势,还有其主要技术和对其的仿真?具体如下: 首先介绍了OFDM的历史背景?发展现状及趋势?研究意义和研究目的及研究方法和OFDM的基本原理?基本模型?OFDM的基本传输技术及其应用,然后介绍了本课题所用的仿真工具软件MATLAB,并对其将仿真的OFDM各个模块包括信道编码?交织?调制方式?快速傅立叶变换及无线信道进行介绍,最后是对于OFDM的流程框图进行分析和在不影响研究其传输性的前提下进行简化,并且对其仿真出来的数据图形进行分析理解? 关键词：复用技术；仿真；快速傅立叶变换；信道编码 ABSTRACT Ofdm is a special kind of the carrier, it can be regarded as one of modulation technique, also a kind of multiplexing technology .One of the main reason to choose ofdm is that the system will be available against frequency selective fading or narrow-band interference.Because of its high frequency spectrum utilization ,ofdm get attention of peopel increasingly. This graduation design is using matlab to carry out simulated ofdm.Simulation experiment is a effective mean of grasp the system performance.By experimental result of mulation model to determine or deduce that the system performance then as the reliable reference for the establishment of the new system and improvment of old system.Paper introduces study implications,development trend and the background,and the main technology and the simulation.Accessories details as follow: Firstly it introduced the historical background ,development trend and situation ,research methods and purpose of study ,the basic principle, the basic model, basic transport technology and applications of ofdm.Then introducing a subject of emulation software tools called matlab and telling each module include code modulation, the channel with a rapidly changing fourier introduced, and radio channels of simulated ofdm.Last,we analyse the flow block diagram infer to ofdm and simplify it on the