대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

MMSE 기반의 다중 빔형성기법을 가진 MIMO-OFDM 시스템의 성능

Performance of MIMO-OFDM systems with multi-beamforming based on MMSE

  • 김찬규 (한밭대학교 전자공학과)
  • Kim, Chan-Kyu (Department of Electronic Engineering Hanbat University)
  • 투고 : 2011.02.23
  • 심사 : 2011.06.15
  • 발행 : 2011.06.25
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초록

시공간 부호화기법을 가진 MIMO(Multiple-input multiple-output)-OFDM(Orthogonal frequency division multiplexing)은 미래의 무선통신 시스템에서 성능향상을 위한 약속된 기술이다. 그러나 다중 송신기를 가진 다른 사용자에 따른 간섭과 다중경로의 지연신호에 따른 영향으로 성능이 크게 감소된다. 이 논문에서는 MIMO-OFDM 시스템에서 시공간 다이버스티를 유지하면서 이와 같은 간섭신호와 다중경로 지연신호를 효율적으로 제거하기 위하여 MMSE(minimizing the mean squared error) 기반의 pre-FFT 다중 빔형성기법을 제안한다. MIMO-OFDM 시스템에 제안된 다중 빔형성기법을 적용할 경우 성능 개선 효과를 CCI(Cochannel interference)를 가진 다중경로 채널환경에서 모의실험을 통하여 확인한다.

Multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) with space-time coding (STC) is a promising technology for future wireless communication systems. However, MIMO-OFDM systems are greatly impaired by large cochannel interference (CCI) from the multiple transmitters. In this paper, we propose pre-fast Fourier transform (FFT) multibeamforming based on MMSE(minimizing the mean squared error) for a MIMO-OFDM system to preserves the STC diversity and to remove the CCI. The improvement in bit error rate is investigated through computer simulation of a MIMO-OFDM system in a multipath channel with CCI.

키워드

참고문헌

  1. A. Paulraj, D. Gore, R. Nabar, and H. Bolcskei, "An Overview of MIMO communications-A Key to gigabit wireless," Proceedings of the IEEE, vol.92,no.2,pp.198-218,Feb. 2004. https://doi.org/10.1109/JPROC.2003.821915
  2. S. M. Alamouti, "A simple transmitter diversity scheme for wireless communications," IEEE J. Select. Area Commun. Vol. 16, No. 8, pp. 1451-1458, Oct. 1998. https://doi.org/10.1109/49.730453
  3. V. Tarokh, N. Seshadri, and A. R.Calderbank, "Space-time codes for high data rate wireless communication: Performance criterion and code construction," IEEE Trans. Inform. Theory, vol.4,pp.744-765,Mar.1998.
  4. Richard D. TJ. Van Nee and Ramjee Prasad, "OFDM for wireless multimedia communication," Artech House, 2000.
  5. Ahmadi,S., "An overview of next-generation mobile WiMAX technology," IEEE comm. Vol.47, no.6, 2009, pp. 84-98.
  6. F. Ivanek, "Convergence and competition on the way toward 4G: Where are we going? In Proc. IEEE Radio Wireless Symp., pp. 265-268, Jan., 2007.
  7. Y. Li and N. R. Sollenberger, "Adaptive antenna arrays for OFDM systems cochannel intereference," IEEE Trans. Commun., vol.47, no.3, pp.217-229, Feb. 1999. https://doi.org/10.1109/26.752127
  8. J. Li, K. B. Letaief, and Z. Cao, "Co-channel interference cancellation for space-time coded OFDM system," IEEE Tran. Commun., vol.2,no.1,pp.41-49, Jan. 2003.
  9. Henfnawi, M., Millette, S, "Performance evaluation of space-time coded smart antenna systems in frequency selective channels," WCT 2003, pp.290-296
  10. N. Achoura and R. Bouallegue, "Multi-user detection for MIMO-OFDM system using joint adaptive Beamforming," ICTTA2008, 3rd ,pp.1-5, Apr.2008.
  11. J. Lorincz and D. Begusic, "Adaptive beamforming structure with STBC for IEEE 802.11n WLAN systems," SoftCOM 2008, 16th, pp. 258-263, Sept. 2008.
  12. E. G. Larsson and P. Stoica, "Space-time block coding for wireless communications," Cambridge, 2003.
  13. S. Haykin, Adaptive filter theory, Prentice Hall, 1996.
  14. C. K. Kim and Y. S. Cho, "Pre-FFT adaptive bemaforming algorithm for OFDM systems with array antenna," IEICE Trans. Commun., Vol. E86-B, No.3, pp. 1144-1148, March, 2003.