电讯技术Issue(11)：1522-1527,6.DOI:10.3969/j.issn.1001-893x.2014.11.012
基于遗传算法的OFDM高精度盲频偏估计器
High Accuracy Blind Carrier Frequency Offset Estimator Based on Genetic Algorithm for OFDM Systems
摘要
Abstract
For the frequency offset estimation in Orthogonal Frequency Division Multiplexing( OFDM) sys-tems,a high accuracy blind carrier frequency offset estimator is proposed. The OFDM system with inter-carrier interference( ICI) is considered as a multi-carrier CDMA system and the ICI coefficient matrix is considered as the spreading codes in CDMA system. The spreading code is designed with estimated fre-quency offset to reconstruct the received signal. The cost function is constructed based on minimum recon-struction error principle between the received signal and actual received signal,and the fitness function is also designed corresponding to the genetic algorithm ( GA ) . With the strong ability of parallel search and global optimization property of the genetic algorithm,the appropriate frequency offset value is achieved by minimizing the cost function. The simulation results show the proposed algorithm performs higher estimation accuracy than conventional methods,especially in low signal-to-noise ratio( SNR) condition,and it reduces time complexity effectively,without the limitation of frequency offset estimation range and modulation type.关键词
正交频分复用/载波频偏/盲频偏估计/遗传算法Key words
OFDM/carrier frequency offset/blind frequency offset estimation/genetic algorithm分类
信息技术与安全科学引用本文复制引用
杨朝阳,杨霄鹏,李腾,姚昆,倪娟..基于遗传算法的OFDM高精度盲频偏估计器[J].电讯技术,2014,(11):1522-1527,6.基金项目
国家自然科学基金资助项目(61202490) Foundation Item:The National Natural Science Foundation of China(No.61202490) （61202490）
