中文摘要：

传统基于互相关的时间同步方法中的目标函数峰值尖锐,便于捕获准确的时间延迟点,但是其性能易受收发机间频率偏移的影响。将恒模零自相关序列作为训练序列,以互相关方式为基础,提出一种适用于存在大频偏情况下的时间、频率同步方法。在相关峰的搜索过程中,与传统方法相比,该方法不增加额外的算法复杂度。大范围的频偏估计同样是在时域通过滑动互相关搜索完成,其具有良好的估计性能,且性能不受频偏大小的影响。仿真表明,该方法同时适用于AWGN信道和衰落信道。

英文摘要：

Conventional cross-correlation based time synchronization methods have sharp correlation peaks,which make it easy to get the exact time delay point.But their performances are vulnerable to the frequency offset between the transmitter and the receiver.By taking the constant amplitude zero auto corelation（CAZAC） sequences as the training sequences,a cross-correlation based time and frequency synchronization method is proposed,which can work with a large frequency offset.Compared with the conventional methods,no extra computational complexity is introduced in the process of searching the correlation peak.The estimation of the large frequency offset is also performed by sliding cross-correlation and is independent of the frequency offset.Simulations show the method is applicable to both AWGN channel and fading channel.