正交频分复用（OFDM）是一种通过快速傅里叶变换实现的多载波宽带数字调制技术。相比一般的数字通信系统。它具有频带利用率高和抗多径干扰能力强等优点，因而适合于高速率的无线通信系统。正交频分复用 OFDM 是第四代移动通信的核心技术。论文首先简要介绍了OFDM基本原理。在给出OFDM系统模型的基础上,用MATLAB语言实现了整个系统的计算机仿真并给出参考设计程序。-Orthogonal frequency division multiplexing (OFDM) is a fast Fourier transform of the multi-carrier wideband digital modulation through. Compared to the general digital communication system. It has high bandwidth efficiency and resistance to multipath interference ability, etc., which is suitable for high-speed wireless communications systems. Orthogonal frequency division multiplexing (OFDM) is a core technology of fourth generation mobile communication. Firstly, brief introduction to the basic principles of OFDM. On the basis of a given OFDM system model, using MATLAB language to achieve a computer simulation program and gives the reference design of the entire system.