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Least Square Channel Estimation Scheme of OFDM System using Fuzzy Inference Method

퍼지 추론법을 적용한 OFDM 시스템의 LS(Least Square) 채널추정 기법

  • Published : 2009.05.28

Abstract

In this paper, the new channel estimation was proposed that have the low complexity and high performance using Fuzzy inference method uses recently from various field for estimation about uncertainty in channel estimation of OFDM. Proposed method is channel estimation performance improve, calculation and interpolation for statistics character of channel using the pilot before LS channel estimation by Fuzzy inference method. Simulation result in QPSK proposed channel estimation method shows the enhancement of 5.5dB compared to the LS channel estimation and the deterioration of 1.3dB compared to the MMSE channel estimation in mean square error point $10^{-3}$. symbol error rate shows similarity performance the MMSE $10^{-1.96}$, proposed channel estimation $10^{-1.93}$ and enhancement of $10^{-0.35}$ compared to the LS channel estimation in signal to noise ratio point 20dB.

Keywords

OFDM;Channel Estimation;Fuzzy

References

  1. Richard van Nee, Ramjee Prasad, "OFDM for Wireless Multimedia Communications," Artech House, 1999
  2. P. H Moose, "A Technique for OFDM Frequency Offset Correction," IEEE Transactions Communication, Vol.42, No.7, pp.2908-2914, 1994(10). https://doi.org/10.1109/26.328961
  3. Zadeh and A. Lotfi, "Fuzzy sets, fuzzy logic, and fuzzy systems," World Scientific, Vol.6, 1996.
  4. Lowen and Robert, "Fuzzy set theory : basic concepts, techniques, and bibliography," Kluwer Academic Publishers, 1996.
  5. Zimmermann and Hans-Jurgen, "Fuzzy set theory-and its applications," Kluwer Academic Publishers, 2001.
  6. P. Bosc and L. Lietard, "Fuzzy integrals and database flexible querying," IEEE International Conference, Vol.1, pp.100-106, 1996(9). https://doi.org/10.1109/FUZZY.1996.551726
  7. D. S. Yeung, D. G. Chen, E. C. C. Tsang, J. W. T. Lee, and X. Z. Wang , "On the generalization of fuzzy rough sets," IEEE Transactions Fuzzy Systems, Vol.13, pp.343-361, 2005(6). https://doi.org/10.1109/TFUZZ.2004.841734
  8. S. Y. Zhao, E. C. C. Tsang, X. Z. Wang, D. G. Chen, and D. S. Yeung, "Fuzzy Matrix Computation for Fuzzy Information System to Reduce Attributes," IEEE Machine Learning and Cybernetics, 2006 International Conference, pp.2300-2304, 2006(8). https://doi.org/10.1109/ICMLC.2006.258677
  9. 라택수, 전용일, 이왕주, 박태준, "OFDM 시스템에서 채널 추정 기법", 전자통신동향분석, 제21권, 제6호, pp.124-132, 2006(12).
  10. J. Van de Beek, Ove Edfors, Magnus Sandell, S. K. Wilson, and P.O. Borjesson, "On Channel Estimation in OFDM System," IEEE VTC '95, Vol.2, pp.815-819, 1995(9). https://doi.org/10.1109/VETEC.1995.504981
  11. T. Kaino and K. Hirota, "Composite fuzzy measure and its application to decision making," IFSA World Congress and 20th NAFIPS International Conferenc, Vol.5, pp.25-28, 2001(7). https://doi.org/10.1109/NAFIPS.2001.943624
  12. S. Ding, Z. Shi, and F. Jin, "Studies on Fuzzy Information Measures," IEEE ICCI 2006, Vol.1, pp.292-296, 2006(7). https://doi.org/10.1109/COGINF.2006.365509
  13. D. Ramot, M. Friedman, G. Langholz, and A. Kandel, "Complex fuzzy logic," IEEE Transactions Fuzzy Systems, Vol.11, pp.450-461, 2003(8). https://doi.org/10.1109/TFUZZ.2003.814832