Abstract: In this paper a timing synchronization algorithm using the geometry character of synchronization metric is presented.In traditional algorithms，the results of synchronization estimation are acquired from the maximum value of metrics.This method produces big variance without statistical and limit computing.Curve fitting with those two computing is introduced to new algorithm.And the simplified algorithm and computation analysis are presented in this paper.Through a plenty of simulations，this new method largely improves the performance over the Schmidl’s algorithm.And the computation of new algorithm is much less than its congeners.

Key words: synchronization, timing, OFDM, curve fitting

摘要： 提出了一种利用帧同步度量的几何特性进行统计判决的高性能帧同步算法。传统算法的帧同步位置通过同步度量的最大值判决获得，既没有极限运算也没有期望运算，缺少了统计平均且产生了方差。该文提出的算法对帧同步度量进行梯形曲线拟合，加入了极限运算和数学期望，并针对工程实现给出了低复杂度简化算法和复杂度分析。经过大量仿真实验证明，该算法的性能比Schmidl算法有明显改善，且复杂度要比其他同类算法低很多。

关键词: 同步, 定时, OFDM, 曲线拟合