一种新的基于重复共轭对称构前导的OFDM同步算法  

A New Timing Synchronization Method for OFDM Systems Based on Repeated-Conjugated-Symmetric Preamble

作　　者：石峰[1,2] 王晨[2] 周柱[1] 张尔扬[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073 [2]空军工程大学工程学院,陕西西安710038

出　　处：《国防科技大学学报》2010年第3期103-108,共6页Journal of National University of Defense Technology

摘　　要：针对基于重复共轭对称结构前导的OFDM系统,提出了一种延迟相关与对称相关相结合的符号同步新算法,在搜索出定时度量峰值位置的基础上,使用固定门限搜索出第一条路径。理论分析表明该方法可以实现性能良好的符号同步。在静态多径信道和6径典型市区信道条件下对新提出的算法进行了仿真,仿真结果表明所提算法可有效抑制传统的基于对称定时度量同步算法中存在的定时位置偏移,获得准确的定时性能。A new timing synchronization method for OFDM systems based on repeated-conjugated-symmetric preamble was proposed. The proposed timing method utilized delayed correlation and symmetric correlation to search the first tap of multipah channel with the fixed threshold after the peak position of timing metric was detected. Theoretic analysis shows that the proposed method can achieve good performance of timing synchronization. Simulation results in static multipath channel and 6-path channel for typical urban show that the proposed method prevents the timing synchronization from moving backward and achieves more accurate timing result than conventional timing synchronization method based on conjugated-symmetric timing metric.

关 键 词：延迟相关 OFDM 对称相关 同步 

分 类 号：TN929.5[电子电信—通信与信息系统]