Performance Analysis of Detection Threshold on OFDM Time Synchronization Using PN Sequences

Many synchronization algorithms for Orthogonal Frequency Division Multiplexing (OFDM) systems have been proposed. Among them, the time synchronization algorithm by correlating the training sequence with the local known sequence can obtain good performance with a sharp synchronization peak. Detection threshold is an important and necessary parameter in time synchronization. In this paper, based on this algorithm, the authors evaluate three different methods of setting threshold and point out one method which performs well when SNR is in large dynamic range. The simulation results are consonant with their theoretic analyses and show that this method is suitable for OFDM systems in multi-path fading channel.