The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Improved Multi-stage Timing Offset Estimation Scheme for OFDM Systems in Multipath Fading Channel

다중경로 페이딩 환경에서 OFDM 시스템을 위한 개선된 다중단계 타이밍 옵셋 추정기법

  • 박종인 (성균관대학교 정보통신공학부) ;
  • 노윤갑 (성균관대학교 정보통신공학부) ;
  • 윤석호 (성균관대학교 정보통신공학부)
  • Received : 2011.07.22
  • Accepted : 2011.09.08
  • Published : 2011.09.30
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Abstract

This paper proposes an improved multi-stage timing offset estimation scheme for orthogonal frequency division multiplexing (OFDM) systems in multipath fading channel environment. The conventional multi-stage timing offset estimation scheme is very sensitive to the random multipath components. By exploiting the sample standard deviation of the cross-correlation values, the proposed scheme achieves a robustness to the random multipath components. Simulation results demonstrate that the proposed scheme has a higher correct estimation probability and has a better mean square error (MSE) performance than the conventional scheme in multipath fading channels.

본 논문에서는 다중경로 페이딩 (multipath fading) 채널 환경에서 직교 주파수 분할 다중 (orthogonal frequency division multiplexing: OFDM) 시스템을 위한 개선된 다중단계 (mu1ti-stage) 타이밍 옵셋 (timing offset) 추정기법을 제안한다. 제안한 기법은 기존의 다중단계 타이밍 옵셋 추정기법이 랜덤한 다중경로 채널 성분에 민감하다는 점을 개선하기 위해 상호 상관함수 샘플 표준편차를 이용한다. 모의실험 결과를 통해 제안한 기법이 기존 기법에 비해 우수한 정추정확률과 (correct estimation probability) 평균제곱오차 (mean square error: MSE) 성능을 가짐을 보인다.

Keywords

Acknowledgement

Supported by : 한국연구재단, 경제부 및 정보통신산업진흥원

References

  1. R. V. Nee and R. Prasad, OFDM for Wireless Multimedia Communications. Artech House, 2000.
  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. https://doi.org/10.1109/26.328961
  3. T. M. Schmidl and D. C. Cox, "Robust frequency and timing synchronization for OFDM," IEEE Trans. Commun., Vol.45, No. 12, pp.1613-1621, Dec. 1997. https://doi.org/10.1109/26.650240
  4. H. Minn, M. Zeng, and V. K. Bhargava, "On timing offset estimation for OFDM systems," IEEE Commun. Lett., Vol.4, No.7, pp.242-244, July 2000. https://doi.org/10.1109/4234.852929
  5. B. Park, H. Cheon, C. Kang, and D. Hong, "A novel timing estimation method for OFDM systems," IEEE Commun. Lett., Vol.7, No.5, pp.239-241, May 2003. https://doi.org/10.1109/LCOMM.2003.812181
  6. K. Shi and E. Serpedin, "Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison," IEEE Trans. Wireless Commun., Vol.3, No.4, pp.1271-1284, July 2004. https://doi.org/10.1109/TWC.2004.828282
  7. A. Awoseyila, C. Kasparis, and B. G. Evans, "Improved preamble-aided timing estimation for OFDM systems," IEEE Commun. Lett., Vol.12, No.11, pp.825-827, Nov. 2008. https://doi.org/10.1109/LCOMM.2008.081054