本文先简要介绍了OFDM的基本原理，然后进行了OFDM添加循环前缀后可以抗多径干扰的数学推导，在给出OFDM系统模型的基础上，用MATLAB语言对系统进行了仿真。最后给出不同信道下，循环前缀、均衡技术对系统误码率影响的比较曲线，并得出结论。-This paper first introduces the basic principles of OFDM, and then after the OFDM cyclic prefix can be added anti-multipath interference mathematical derivation is given on the basis of OFDM system model, using MATLAB language for system simulation. Finally, under different channel, cyclic prefix, equalization effects on BER comparison curve, and draw conclusions.