一种OFDM系统时间同步新算法

摘要

Timing synchronization is one of the key technologies for OFDM systems.This paper presents a novel timing synchroni⁃zation algorithm based on the Chu sequence combining with difference method.This algorithm can overcome the negative effect of noise and frequency offset on timing offset estimation,providing good timing performance at the low SNR.The validity and reliability of the proposed algorithm has been verified in AWGN channel and Rayleigh multi⁃path channel.%时间同步是正交频分复用（ Orthogonal Frequency Division Multiplexing， OFDM）的关键技术之一。在传统的基于互相关定时同步算法的基础上，结合差分方法，提出了一种利用Chu序列的新的定时同步算法。该算法同时克服了噪声和频偏对定时的不良影响，在低信噪比下仍具有很好的定时性能。在AWGN和Rayleigh多径信道下分别对所提方案进行了仿真，验证了该方案的有效性和可靠性。