一种改进的基于LS的OFDM盲同步算法  

A Modified Blind Synchronization Algorithmfor OFDM Based on LS

作　　者：王季立[1] 郭道省[2] WANG Ji-li GUO Dao-xing(Unit 62215 ,PLA,Golmud Qinghai 816000,China College of Communication Engineering,PLA University of Science and Technology, Nanjing Jiangsn 210007, China)

机构地区：[1]中国人民解放军62215部队 [2]解放军理工大学通信工程学院

出　　处：《无线电通信技术》2017年第2期47-50,共4页Radio Communications Technology

摘　　要：在基于LS(lease squares)的OFDM盲同步算法基础上,提出了一种性能优良的OFDM盲同步算法。采样周期取为原算法采样周期的M倍,计算出抽样点处的判决函数值,然后对相邻的判决函数值进行前后移动平均,定时点取为使移动平均值为最小时对应的那2个抽样点的中间位置。仿真结果表明:该算法不仅减少了计算量,而且在复杂的多径衰落信道中,定时和频偏估计性能也有大的改善。A robust blind synchronization method for OFDM is proposed which is based on the LS blind synchronization algorithm.Firstly,the sampling period is taken as M times of the original algorithm to calculate the decision function value at the sampling points,and then the moving averages of adjacent decision function values are calculated.The timing point is the intermediate position between the two sampling points where the moving average is the minimum. The simulation results show that the proposed method not only reduces the amount of calculation,but also improves significantly the timing and frequency offset estimation performance in complicated multipath fading channels.

关 键 词：OFDM 盲同步 LS 

分 类 号：TN911.7[电子电信—通信与信息系统]