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｡
OFDM（Orthogonal Frequency Division Multiplexing）is one kind of special multi-carrier plan. It may be regarded as one kind of modulating technique, also can be regarded as one kind of multiplying technique. The primary cause of choosing OFDM in this project is that it can be able to resist the frequency selective declining well or the clipping interference. Due to the high frequency spectrum using OFDM, and the low cost, OFDM has been attached more and more people's attention.
This project is carried on the simulation using MATLAB for OFDM. The simulation experiment is one of effective method to understand a system and its performance. It can determine the system performance through the simulation model experiment. Therefore it can provide the reliable reference for the new system establishment or the original system updating.
The paper introduces the research significance ，the background and the trend of development of OFDM technology, and its primary technology and simulation. Specifically as follows:
Firstly, the paper introduces the historical background, the developing tendency of present situation, the research significance, the research goal, the research way of the OFDM ,and then the basic principle，basic model, basic transfer technology and application of OFDM. And then, the paper also introduces the simulation tool software MATLAB which is used in the project, and introduces each module of OFDM including the channel coding, interleaves, modulation, the fast Fournier transformation and the wireless channel in this simulation. Finally, the paper analyzes the flowing diagram of OFDM and carries on the simulations on the simplification module which does not affect the research of the transmission, and then discusses the results obtained from the simulation experiments.
Key words: OFDM, Wireless channel, Multipart effect, MATLAB, IFFT
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