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A Robust OFDMA Channel Estimation Against Imperfect Synchronization  

Chae Soo-Jin (이화여자대학교 정보통신학과 이동통신연구실)
Kim Eun-Ju (이화여자대학교 정보통신학과 이동통신연구실)
Kim Nak-Myeong (이화여자대학교 정보통신학과 이동통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.8A, 2005 , pp. 649-655 More about this Journal
Abstract
We propose a robust channel estimation method against imperfect synchronization in orthogonal frequency division multiple access (OFDMA) downlink systems. We address time and frequency synchronization, and the channel estimation at the same time, and try to minimize the error propagation from the time and frequency synchronization steps into the chailnel estimation. The simulation results show that the proposed channel estimation method outperforms the conventional algorithms by about 3dB, and circumvents the problem of mismatch among the synchronization tasks.
Keywords
OFDMA; Channel Estimation; Time offset; Frequency offset;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 F. Daffara and O. Adami, 'A new frequency detector for orthogonal multicarrier transmission techniques,' IEEE 45th VTC, pp.804-809, Jul. 1995
2 P. Robertson and S. Kaiser, 'Analysis of the effects of phase noise in orthogonal frequency division multiplexing (OFDM) systems,' ICC'95, vol. 3, pp.1652-1657, 1995
3 T.M. Schmidl and D. C. Cox, 'Robust frequency and tlmmg synchronization for OFDM,' IEEE Trans. on Commun., vol. 45, no.12, pp.1613-1621, Dec, 1997   DOI   ScienceOn
4 강연석, 김영수, 서덕영, 김진상, 'OFDM 시스템을 위한 LMMSE 채널추정기법의 성능 개선,' 한국통신학회논문지 제30권 2A호 2005
5 M.A. Visser, and Y. Bar-Ness, 'A novel method for blind frequency offset correction in OFDM Systems,' PIMRC'98, pp.816- 820, Sep. 1998
6 S. Wu and Y. Bar-Ness, 'Performance analysis on the effect of phase noise in OFDM systems.' ISSSTA '02, Sep. 2002   DOI
7 T. Pollet, M.V. Bladel and M. Moeneclaey, 'BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise,' IEEE Trans. Commun., vol. 43, no. 2, pp.191-193, Feb. 1995   DOI   ScienceOn
8 J.A.C Bingham, 'Multicarreir modulation for data transmission; an idear for whose time hans come,' IEEE Commun. Mag., no.28, pp.5-14, 1990