一种基于导频能量分布的OFDM频率同步算法  

A pilot energy distribution based frequency synchronization method for wireless OFDM systems

作　　者：尚政[1] 毛雪鸿[1] 朱近康[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室,安徽合肥230027

出　　处：《中国科学技术大学学报》2006年第2期125-130,共6页JUSTC

基　　金：国家"863"计划(2001AA123011);国家自然科学基金(60241003)资助

摘　　要：提出了一种新的频率同步算法,并将其用于无线正交频分复用(OFDM)系统.该算法根据扩散后的导频能量分布特征,充分利用扩散到相邻子载波上的pilot能量,同时完成了频率粗估计和精估计.还设计了一个实用的积累流程来实现该算法,可以在估计性能和同步时间之间做较好的折中.仿真结果表明,在不同多普勒频偏下,该算法都具有良好的性能.A new frequency synchronization algorithm for wireless orthogonal frequency division multiplexing （OFDM） systems has been proposed. The method is based on the distribution of the pilot energy, which utilizes the pilots＇ energy efficiently by collecting the energy leaking into the neighbour sub carriers, and gives coarse and fine estimations of the frequency offset at the same time. Furthermore, an accumulator is designed to fulfill the algorithm and to make a good trade off between the performance and the synchronization time. Computer simulation results demonstrate that the proposed method performs well even at high Doppler frequency shifts.

关 键 词：正交频分复用 载波频偏 频率同步 导频 子载波间干扰 

分 类 号：TN929.5[电子电信—通信与信息系统]