哈尔滨工业大学学报（英文版）2008，Vol.15Issue(5)：653-656,4.
A novel frequency synchronization scheme for OFDM systems
A novel frequency synchronization scheme for OFDM systems
摘要
Abstract
A novel frequency synchronization scheme for orthogonal frequency division multiplexing(OFDM) systems is proposed,including a novel frequency offset estimation algorithm and a novel frequency offset compensation algorithm.The frequency offset estimation includes both the fractional frequency offset(FFO)estimation and the integral frequency offset(IFO)estimation.Firstly,the FFO WaSsobtained by the conventional ML algorithm in time domain.After the FFO was compensated in time domain,the IFO Was obtained by the proposed algorithm based on the energy of virtual carriers.This algorithm needs only simple calculations and has a large frequency offset estimation range.Furthermore,it is insensitive to symbol synchronization errors and channel changing.Finally,the IFO Was compensated based on the carrier-positions offset,which Can be completed through carrier-positions cyclic shifts in frequency domain.This proposed frequency synchronization scheme can decrease the system redundancy without any need of assistant data,and can be applied to the fast synchronization with the only need of one OFDM symbol.The analyses and simulations show the improved performance of the proposed frequency synchronization scheme.关键词
OFDM systems/frequency synchronization/virtual carriers/MLKey words
OFDM systems/frequency synchronization/virtual carriers/ML分类
信息技术与安全科学引用本文复制引用
WANG Wen-fang,LI Bing-bing..A novel frequency synchronization scheme for OFDM systems[J].哈尔滨工业大学学报（英文版）,2008,15(5):653-656,4.基金项目
Sponsored by the National Natural Science Foundation Important Project Reserch of China(Grant No.60496316),the National Natural Science Foundstion of China(Grant No.60772138),the National 863 Plans Projects(Grant No.2007AA01Z288)and the College Discipline Innovation Plan Project (Grant No．B08038). （Grant No.60496316）
