中文摘要：

提出了一种改进的OFDM联合时间频率同步算法，通过使用两组训练符号，该算法可以很好的完成突发或连续的OFDM通信系统的同步．其中，第一个训练符号用于估计小数频偏，并完成粗定时同步，第二个训练符号用于估计整数频偏，并进一步精确的调整定时同步位置．仿真结果表明，该算法具有更小的定时估计误差．

英文摘要：

This paper presents a new OFDM synchronization method. By using two training sequences, the presented method can perfectly realize the synchronization task either in burst or continuous transmission mode. The first training sequence is used to finish the symbol timing and evaluate the decimal frequency offset. The second one is used to evaluate the integral frequency offset. The simulation re sults show that the proposed method can give out smaller timing estimation error.