中文摘要：

针对OFDM符号同步基本算法在低信噪比条件下定时度量值低和干扰峰严重的缺点,提出了一种改进算法。该算法在基于训练序列符号同步的典型算法基础上,对训练序列的帧结构进行了改进,将共轭序列带入到帧结构中,同时改变了度量函数的计算方法。改进后的算法在低信噪比条件下有5 d B的性能提升,且具有计算量小、受信噪比影响小和实现简单等优点。仿真验证了改进算法在低信噪比环境下的有效性。

英文摘要：

In view of the existence of high redundant peaks and of low timing metric when the classical methods are used in the condition of low SNR OFDM systems,a new symbol synchronization method with new training sequence and new timing metric calcula- tion is proposed in this paper.The improved method has advantages of ease for implementation, smaller calculations and low influence by SNR difficultly.The effectiveness of the method will be verified by the simulation results.