Decision-Directed Frequency Tracking Algorithm for OFDM System in Fast Fading Environments  

作　　者：HE Bo LI Jun LIN Jia-ru WU Wei-ling 

机构地区：[1]School of Information Science and Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China [2]School of Information Science and Engineering, Shandong University

出　　处：《The Journal of China Universities of Posts and Telecommunications》2005年第2期46-49,63,共5页中国邮电高校学报（英文版）

基　　金：This work is supported by National Natural Science Fundation of China(60372099) , and National "863" High Technology Projects of China(2001AA123016) .

摘　　要：This paper analyzed the structure of Orthogonal Frequency Division Multiplex （OFDM） system and presented a new Carrier Frequency Offset （CFO） tracking algorithm, which depends on comparability between the decision data and the original data to correct carrier frequency offset. Therefore it is robust during the normal communization process since the Bit Error Rate （BER） of the decision data is low. We can utilize pilot data in time domain for channel estimation to track CFO without reducing system efficient and to enhance the tracking scope largely. Simulation results denote the presented algorithm can track the frequency offset and control it under ± 1% using only 1 frame if the original frequency offset is within ±8% .This paper analyzed the structure of Orthogonal Frequency Division Multiplex （OFDM） system and presented a new Carrier Frequency Offset （CFO） tracking algorithm, which depends on comparability between the decision data and the original data to correct carrier frequency offset. Therefore it is robust during the normal communization process since the Bit Error Rate （BER） of the decision data is low. We can utilize pilot data in time domain for channel estimation to track CFO without reducing system efficient and to enhance the tracking scope largely. Simulation results denote the presented algorithm can track the frequency offset and control it under ± 1% using only 1 frame if the original frequency offset is within ±8% .

关 键 词：OFDM MULTICARRIER carrier frequency synchronization carrier frequency tracking 

分 类 号：TN911[电子电信—通信与信息系统]