OFDM技术的理论分析与仿真实现

文章对正交频分复用技术（OFDM）包括子载波间隔的选择、调制解调原理进行了理论分析；对OFDM系统的IFFT／FFT实现进行了数学推导，并给出了一种基于IFFT／FFT的OFDM系统仿真方案以及该方案仿真参数的设计方法和步骤，为实际应用中OFDM系统的设计提供了理论依据；给出了该方案的OFDM系统仿真结果，验证了OFDM信号的白噪声特性和OFDM通信系统较强的抗频率选择性衰落特性。

Theoretical analysis and system simulation of OFDM technique

In this paper orthogonal frequency division multiplexing technique (OFDM) is theoretically analyzed, including the choice of subcarrier interval and modulate-demodulate principle, the analysis is helpful to understand OFDM entirely, it is mathematically actualized to use IFFT/FFT in OFDM system, then the OFDM system simulation scheme based on IFFT/FFT and the approach of the design parameters are proposed, which offer theoretical foundation for the design of practical OFDM system. Finally the simulating result is presented, which validates white noise characteristic of the OFDM signal and the characteristic of anti-attenuation of frequency-selected of OFDM communication system.