新的OFDM系统同步联合算法  

A Novel Joint Synchronization Algorithm for OFDM System

作　　者：李兵兵[1] 王雯芳[1] 葛建明[1] 张丰华[2] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071 [2]西安航空计算技术研究所,西安710068

出　　处：《电子科技大学学报》2008年第4期527-529,共3页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60496316、60772138);国家863计划(2007AAO1Z288)

摘　　要：对正交频分复用(OFDM)系统的同步算法进行了研究。提出了一种基于循环前缀和虚载波的联合算法。该算法不需要辅助数据,降低了系统冗余度。该算法首先根据循环前缀的特点,用ML算法完成符号同步和小数频偏估计;其次根据虚载波的位置偏移得到整数频偏估计。仿真表明,该算法能够实现符号同步和大范围的频偏估计、计算复杂度低、系统冗余度小,并且可用于快同步。Synchronization algorithm for orthogonal frequency division multiplex （OFDM） systems is discussed. A joint algorithm is proposed based on cyclic prefix and virtual carriers. This algorithm does not need assistant data hence decreases system redundancy. In the algorithm, the symbol synchronization and the fractional frequency offset are obtained by using ML algorithm based on the cyclic prefix property, and the integral frequency offset is obtained by the position offset of virtual carriers. The results show the proposed algorithm not only achieves symbol synchronization and large range of frequency offset estimation, without increased calculation complexity and system redundancy, but also can be used for fast synchronization.

关 键 词：频率同步 联合算法 OFDM 号同步 虚载波 

分 类 号：TN919.3[电子电信—通信与信息系统]