多径信道下的改进型OFDM定时同步方法

Improved OFDM Timing Synchronization Method in Multipath Channel

正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术具有数据传输速率快、频谱利用率高等优点,因此被广泛运用;但是,其对定时同步要求很高,尤其是在多径信道下,准确的定时同步尤为重要。针对这一问题,提出了一种基于扎多夫-楚(Zadoff-Chu,ZC)序列的前导码结构,并使用动态阈值法进行判别的改进型OFDM定时同步方法,最后在多径信道下通过仿真验证了其性能。

Orthogonal Frequency Division Multiplexing(OFDM)technology has the advantages of fast data transmission rate and high spectrum efficiency,so it is widely used.However,it has high requirements for timing synchronization,especially in multipath channels,where accurate timing synchronization is particularly important.Aiming at this problem,an improved OFDM timing synchronization method based on Zadoff-Chu(ZC)sequence preamble structure and using dynamic threshold method is proposed.Finally,its performance is verified by simulation in multipath channel.