：正交频分复用(OFDM)是第四代移动通信的核心技术。该文首先简要介绍了OFDM基本原理，重点研究了理想同步情 况下，保护时隙(cP)和不同的信道估计方法在高斯信道和多径瑞利衰落信道下对OFDM系统性能的影响。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 the fourth-generation mobile communic

简要而又完整的OFDM系统仿真，文件中有仿真基于模拟调制的OFDM系统，也有仿真基于FFT变换的OFDM系统，还给了完整的基于IEEE 802.11a标准的OFDM系统仿真，并且分析了单径和多径瑞利衰落信道下的误码性能-Brief but complete OFDM system simulation file OFDM system simulation based on analog modulation, OFDM system simulation based on the FFT, a

在瑞利衰落信道下的OFDM系统仿真程序，得出信噪比与误码率的相关结果。-OFDM system simulation program in the Rayleigh fading channel, the results of the signal to noise ratio and bit error rate are obtained.

method based on Neural Network (NN) technique and accompanied with MMSE (Minimum Mean Square Error), which corrects at the receiver level, the Non-Linear (NL) distortions due to the HPA (High Power Amplifier).-In this paper, we present a meth