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引入加权系数的OFDM同步算法研究
引用本文:田野,谈振辉,温伟刚.引入加权系数的OFDM同步算法研究[J].北京交通大学学报(自然科学版),2007,31(2):29-33.
作者姓名:田野  谈振辉  温伟刚
作者单位:轨道交通控制与安全国家重点实验室;轨道交通控制与安全国家重点实验室
摘    要:提出了一种改进的OFDM联合时间频率时域快速同步算法,通过引入加权系数,本算法使用一个OFDM符号长度的训练符号,就可以在时域很好的完成AWGN信道下OFDM通信系统的同步.该算法具有较高的定时同步精度和较快的同步速度.同时,对通过引入加权系数后可以灵活设计训练符号结构的算法进行研究.通过理论分析和仿真得出结论,在多径衰落信道下,加权系数的使用必须满足一定条件,才不会影响频偏估计性能.

关 键 词:正交频分复用  定时同步  加权系数  频偏
文章编号:1673-0291(2007)02-0029-05
修稿时间:2006年9月25日

Research on the Weighted-Factors-Introduced Synchronization Method for OFDM
TIAN Ye,TAN Zhen-hui,WEN Wei-gang.Research on the Weighted-Factors-Introduced Synchronization Method for OFDM[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,2007,31(2):29-33.
Authors:TIAN Ye  TAN Zhen-hui  WEN Wei-gang
Abstract:This paper proposes an improved joint timing and frequency fast synchronization method re- alized in time domain for OFDM communication system in AWGN channel.By introducing the weighed-factors,the new method can perfectly realize the synchronization task by using only one train- ing sequence.The improved algorithm can also improve the timing synchronization accuracy and the synchronization speed.Meantime,the algoriohm which can design the training sequence freely by in- troducing the weighted-factors is also studied.By theory analysis and computer simulation,a conclusion is drawn as follow:In multipath Channel,the usage of weighed-factors must fit some conditions,oth- erwise the accuracy of frequency estimation will be reduced.
Keywords:orthogonal frequency division multiplexing(OFDM)  timing synchronization  weighted-factors  frequency offset
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