Browse > Article

Robust fine carrier offset estimation for OFDM in Doppler conditions  

Kang, Eun-Su (School of Electrical Engineering and Computer Science, Kyungpook National University)
Han, Dong-Seog (School of Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.5, 2009 , pp. 109-114 More about this Journal
Abstract
An orthogonal frequency division multiplexing(OFDM) system is effective to bandwidth because of orthogonality of subcarriers and robust to multipath fading. However, if there is a frequency offset, we lose the orthogonality of subcarriers and that results in inter-carrier interference(ICI) which increases errors in the system. In this paper, we propose an algorithm that estimates the fine frequency offset using a correlation method in OFDM systems. This scheme compares two correlation values in different frequency offsets with opposite directions. From the difference between two correlation values we can derive a fine frequency offset estimation algorithm. Its performance is verified by computer simulations.
Keywords
Synchronization; Frequency Offset Estimation; OFDM;
Citations & Related Records
연도 인용수 순위
  • Reference
1 F. Classen and H. Meyr, 'Frequency synchronization algorithms for OFDM systems suitable for communication over frequency selective fading channels,' in Proc. VTC-1994, vol.3, pp.1655-659, 1994   DOI
2 P. H. Moose, 'A technique for orthogonal frequency division multiplexing frequency offset correction,' IEEE Trans. Commun., vol. 42, no. 10, pp. 2908-2914, Oct. 1994   DOI   ScienceOn
3 Final draft 'ETSI EN 300 744 v1.5.1', June 2004
4 J. J. van de Beek, M. Sandell, and P. O. B$\ddot{o}$rjesson, 'ML estimation of time and frequency offset in OFDM systems,' IEEE Trans. Signal Processing, vol. 45, pp. 1800-1805, July 1997   DOI   ScienceOn
5 B. Y. Prasetyo, F. Said and A. H. Aghvami, 'On the guard band-based coarse frequency offset estimation technique for burst OFDM systems' in Proc. VTC2000-Spring, vol. 1, pp. 220-224, Tokyo, 2000
6 ETSI EN 300 401, 'Radio broadcasting systems; Digital Audio Broadcasting(DAB) to mobile, potable and fixed receivers', 1994
7 F. Daffara, O. Adami, 'A new frequency detector for orthogonal multicarrier transmission techniques,' in Proc. VTC1995, vol.2, pp.804-809, 1995
8 H. Nogami and T. Nagashima, 'A frequency and timing period acquisition technique for OFDM systems,' in Proc. PIMRC-1995, vol.3, pp.1010-1015 1995
9 J. Jo, H. Kim and D. S. Han, 'Residual frequency offset compensation for IEEE 802.11a,' in Proc. VTC2004-Fall, vol. 3, pp. 2201-2204, LA, Sept. 2004