一种数据辅助的OFDM符号定时同步算法

摘要

针对正交频分复用系统的同步偏差敏感性,提出了一种新的符号定时同步算法.该算法通过新设计的训练序列结构,得到新的符号定时偏移估计函数表达式.仿真结果表明,该算法有效地克服了Schmidl、Minn和Park算法中的符号定时缺陷,并且在低信噪比下能实现更准确的同步；另外,该算法在同等条件下符号定时偏移估计的均方误差更低.%To overcome the serious influence of synchronization offset on OFDM communication systems, this paper proposed a novel symbol timing synchronization algorithm. It deduced the new symbol timing offset estimation function expressions fay the new structure of training sequence. Simulation results show that the proposed algorithm effectively overcomes the symbol timing defect in Schmidl' s, Minn' s and Park' s methods. The proposed algorithm has a more accurate synchronization in low signal noise ratio. Moreover, symbol timing offset estimation of the proposed algorithm has lower mean-square error under the same conditions.