中文说明：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。最后给出在不同的信道条件下,保护时隙、信道估计方法对OFDM系统误码率影响
English Description：
Orthogonal frequency division multiplexing (OFDM) are the core of the fourth generation mobile communication technology. This paper briefly introduces the OFDM principle focuses on the ideal synchronization scenarios, protected time slot (CP) and differences in Gaussian channel and channel estimation method for OFDM Systems in multipath Rayleigh fading channel performance impact. In OFDM system model based on computer simulation of the entire system was implemented in MATLAB language and gives a reference design program. Presented in a variety of channel conditions, protected time slots, channel BER estimation method for OFDM system comparison of the effects of curves come to better conclusions