基于matlab的ofdm接收系统设计与仿真 通信工程专业 毕业论文.doc

PAGE 17 装订线 装 订 线 本科生毕业论文（设计） 题目：基于MATLAB的OFDM 接收系统设计与仿真 学 院 电子信息工程学院 学科门类 工学 专 业 通信工程 学 号 姓 名 指导教师 2011年5月12日 河北大学2011届本科生毕业论文（设计） 基于MATLAB的OFDM接收系统设计与仿真 摘　　要 OFDM即 正交频分复用技术，实际上是多 载波调制中的一种。其主要思想是：将 信道分成若干正交子信道，将高速数据信号转换成并行的低速子数据流，调制到相互正交且重叠的多个子载波上同时传输。该技术的应用大幅度提高无线通信系统的信道容量和传输速率，并能有效地抵抗多径衰落、抑制干扰和窄带噪声，如此良好的性能从而引起了通信界的广泛关注。 本文设计了一个基于FFT算法的OFDM接收系统，并在计算机上进行了仿真和结果分析。重点放在OFDM接收系统设计与仿真，在这部分详细介绍了系统各模块的组成及设计机理，然后对OFDM信号经过AWGN信道后进行解调，整个过程都是在MATLAB环境下仿真实现，并对接收系统的仿真结果及性能进行分析，通过仿真得到信噪比与误码率之间的关系，为该系统的具体实现提供了大量有用数据，为OFDM通信系统的进一步改进奠定了基础。 关键词： 正交频分复用；MATLAB；接收系统；设计仿真 OFDM Receiver Design and Simulation Based on MATLAB ABSTRACT OFDM, which is short for Orthogonal Frequency Division Multiplexing, is actually one of the multi-carrier modulations. The main idea of OFDM is to split the channel into a number of orthogonal subchannels and the high-speed data signals into a number of parallel low-speed data signals that are transmitted simultaneously over numbers of subcarriers. This technology greatly improves the channel capacity and transmission rate of the wireless communication system and effectively resists to multipath fading interference and inhibits narrowband noise. Such a good performance has brought widespread concern in the communication area. In this thesis, based on the FFT algorithm, an OFDM receiver system is designed and simulated on a computer. This article focuses on the OFDM receiver design and simulation and details the components and design of each module of the system, and then the demodulation of the OFDM signals transmitted through AWGN channel. The entire process is realized under the MATLAB simulation environment. And then it analyzes the receiver system simulation results and performance, through which we get the relation between SNR (signal to noise) and BER (bit error rate), providing a great numbers of useful datas for the concrete realization of th