OFDM系统的PAPR抑制算法设计.DOC

本科毕业论文（设计） 题 目OFDM关键技术的研究及其通信系统仿真设计 学 院 ____电子信息工程学院___ 专 业 ____ 电子信息工程____ 年 级 ______ _ 2007级 学 号 222007315222035 姓 名 ______ _ 汪洋 指 导 教 师 ______ _ 王进华 成 绩 _____________________ 2011年 4月30日OFDM关键技术的研究及其通信系统仿真设计 汪 洋 西南大学电子信息工程学院，重庆北碚 400715 摘 要：OFDM（Orthogonal Frequency Division Multiplex）（MCM,Multi-Carrier Modulation）（FFT）（）DVB（）OFDM技术的发展过程、应用及其关键技术原理，接着提出了一个基于MATLAB的OFDM通信系统实现方案，最后利用MATLAB软件对OFDM传输性能进行仿真并与16QAM（正交振幅调制，一种传统的单载波调制方式）的性能进行了比较，仿真结果表明OFDM技术的抗多径干扰能较强。 关键词：正交频分复用（OFDM）Study On Key Technologies and Design and Simulation of OFDM Communication System Wang Yang School of Electronics and Information Engineering, Southwest University, Chongqing 400175, China Abstract:Orthogonal Frequency Division Multiplexing(OFDM) is a multi-carrier modulation technology.It’s principal thought is that transmitting data simultaneously over multiple equally spaced carrier frequencies and using Fast Fourier Transform processing for modulation and demodulation.The main advantages of OFDM versus other types of modulation are better use of the available bandwidth and better performance in multi-path environments,so it has been widely used in high-data-rate wireless communication systems,such as wireless local-area networks and digital video broadcasting and high distinction television. This paper firstly introduces the development and applications and the theory of OFDM key technologies,then presents a implementation scheme of OFDM communication system based on MATLAB.Finally,I make use of MATLAB to simulate the transmission performance of OFDM.In order to compare OFDM to a traditional single carrier communication syetem,a Quadrature Amplitude Modulation (16QAM) simulation has also been performed,the result shows that OFDM has better performance in multi-path environments . Key words: OFDM；MATLAB；FFT；Simulation 目 录 一、绪论 1 二、OFDM系统的基本原理 2 2.1 正交调制解调 2 2.2系统组成 5 2.2.1 串并转换 5 2.2.2信道编码 6 2