OFDM精细定时同步算法性能分析

Theoretical analysis of OFDM fine timing synchronization algorithm

在OFDM系统中,定时同步估计的精度直接影响到了系统的整体性能。目前尚无文献对OFDM系统的精细定时算法进行理论分析,其性能基本都是通过仿真得到,不便于对OFDM系统性能进行理论分析。本文对瑞利信道下基于PN序列自相关特性的精细定时同步算法性能进行了理论分析,得到了精细定时误差的概率密度函数,与仿真得到的概率密度函数基本一致。

The accuracy of timing synchronization influences the performance of OFDM-based system directly. However,there is no theoretical analysis of the accuracy of fine timing synchronization by now and the performance of fine timing synchronization algorithm is obtained by simulation commonly. In this paper, a fine timing synchronization algorithm based＇ on autocorrelation characteristics of PN sequence is analyzed theoretically. As a result, the cumulative density function of fine timing error is derived. It is shown that the theoretical analysis results matches simulation results perfectly.