一种OFDM符号同步的改进算法

同步是OFDM(正交频分复用)系统中极为关键的一个环节.OFDM同步方面比较经典的算法有S&C算法和PARK算法,然而S&C算法存在平台效应,PARK算法在信噪比低的情况下定时效果不佳,鉴于此,提出一种改进的符号同步算法.该算法通过改进训练序列前置的循环前缀CP,基本消除了传统算法中因循环前缀的存在而产生的平台效应.仿真结果表明,改进算法可以消除以上两种算法所存在的缺陷,消除平台效应的同时,在低信噪比以及多径衰落的信道环境下仍然具有较为理想的同步效果.

An improved OFDM Symbol Synchronization Algorithm

Synchronization is a critical aspect to OFDM systems.There are classic algorithms of OFDM synchronization, S C algorithm and PARK algorithm,however,there is platform effect in S C algorithm,and the timing effect of the PARK algorithm in low SNR case is poor.In view of this,we propose an inproved symbol synchronization algorithm.In view of this,we propose an improved synchronization algorithm.This algorithm basically eliminating the plateau effect due to the presence of traditional algorithms generated by cyclic prefix with the method of improving the pre-training sequence cyclic prefix CP. Simulation results show that: the improved algorithm can eliminate the defect of the traditional algorithms,while eliminating the platform effect,in the mean time, this algorithm can have relatively good effects in the case of low SNRas well as in the multi-path fading channel environment.