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系统误码率影响的比较曲线,得出了较理想的结论。-Orthogonal frequency division multiplexing (OFDM) is the fourth generation mobile communications core technology. This article first introduces the basic principles of OFDM, focus on the ideal synchronous case, protection time slot (CP) and different channel estimation in the Gaussian channel and multipath Rayleigh fading channel on the OFDM system performance. In the OFDM system model is given based on the MATLAB language with the computer simulation of the entire system and gives reference to the design process. Finally, in a different channel conditions, the protection time slot, channel estimation method for OFDM system, the comparison of bit error rate curves, obtained better results.