Interference cancellation aided channel estimation for OFDM/OQAM system  

作　　者：CHENG GuoBing XIAO Yue HU Su LI ShaoQian 

机构地区：[1]National Key Laboratory of Science and Technology on Communications, University of Electronic Scienceand Technology of China [2]Telecommunication Engineering Institute of Air-force Engineering University [3]National Mobile Communications Research Laboratory, Southeast University

出　　处：《Science China(Information Sciences)》2013年第12期159-166,共8页中国科学（信息科学）（英文版）

基　　金：supported in part by Key Laboratory of Universal Wireless Communications, Beijing university of Posts and Telecommunications, Ministry of Education (Grant No. KFKT-2012102);Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (Grant Nos. 2013D05, 2012D03);Fundamental Research Funds for the Central Universities (Grant No. ZYGX2010X003);National Natural Science Foundation of China (Grant No. 61101090)

摘　　要：Abstract Orthogonal frequency division multiplexing offset-QAM （OFDM/OQAM） is a promising multi- carrier transmission technique for its merits such as operating without cyclic prefix （CP） and flexibility of introducing well time-frequency localized pulse shapes. However, under dispersive channel condition, the intrinsic inter-symbol and inter-carrier interference arises in OFDM/OQAM system. Especially, the surrounding data symbols will cause interferences to the pilot symbols, leading to channel estimation error and degradation of system performance. In this paper, an efficient pilot structure and a channel estimation method are proposed for OFDM/OQAM system. The basic principal is to rebuild the transmitted symbols around the considered pilot position through pre-decision, then calculate and cancel the interference from the received signal. Analysis and simulation results show that the proposed scheme outperforms conventional ones with respect to both channel estimation accuracy and bit error rate （BER） performance while with less pilot consumption.Abstract Orthogonal frequency division multiplexing offset-QAM （OFDM/OQAM） is a promising multi- carrier transmission technique for its merits such as operating without cyclic prefix （CP） and flexibility of introducing well time-frequency localized pulse shapes. However, under dispersive channel condition, the intrinsic inter-symbol and inter-carrier interference arises in OFDM/OQAM system. Especially, the surrounding data symbols will cause interferences to the pilot symbols, leading to channel estimation error and degradation of system performance. In this paper, an efficient pilot structure and a channel estimation method are proposed for OFDM/OQAM system. The basic principal is to rebuild the transmitted symbols around the considered pilot position through pre-decision, then calculate and cancel the interference from the received signal. Analysis and simulation results show that the proposed scheme outperforms conventional ones with respect to both channel estimation accuracy and bit error rate （BER） performance while with less pilot consumption.

关 键 词：OFDM/OQAM channel estimation interference cancellation 

分 类 号：TN919.3[电子电信—通信与信息系统] TN929.533[电子电信—信息与通信工程]