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CIR Performance Enhancement by Frequency Offset Estimation in OFDM System  

Ko, Seong-Hui (충북대학교 정보통신공학과)
Choi, Jung-Hun (충북대학교 정보통신공학과)
Lee, Dong-Ho (충북대학교 정보통신공학과)
Kim, Nam (충북대학교 전자정보대학)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.4C, 2009 , pp. 446-452 More about this Journal
Abstract
OFDM system has a disadvantage of sensitiveness about the effect of frequency offset caused by the discord of oscillators in the transmitter and receiver. Either, the frequency offsets in mobile radio channels distort the orthogonality between sub-carriers resulting in the inter-carrier interference(ICI). In this paper, we analyze the effect of the ICI and propose a new method using SC technique. To analyze BER(Bit Error Rate) and CIR(Carrier to Interference Ratio) performance of the proposed method. the simulation program MATLAB is used. By the simulation results, SNR performance is improved by this method. In case the frequency offset is 0.3 and 0.5, SNR gains are over 0.5dB and 1dB in the BPSK modulation and 1dB and 2dB in the QPSK modulation at BER of $10^{-3}$ respectively. In addition, CIR performance is improved over 15dB. As a result, the proposed method is more effective to improve the system performance than the conventional method.
Keywords
ICI; CIR; SC cancellation; frequency offset;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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