Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

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

DOI QR Code

Performance Improvement of Retrodirective Antenna System using Turbo Equalizer

터보등화기를 이용한 디지털 역지향성 안테나 시스템의 성능 개선

  • Kim, Bong-Jun (Department of Electronics and Engineering, Chungbuk National University) ;
  • Ryu, Heung-Gyoon (Department of Electronics and Engineering, Chungbuk National University)
  • Received : 2013.08.28
  • Published : 2014.01.25
Download PDF
⟨ Previous Next ⟩

Abstract

A digital RDA(Retrodirective Antenna) system is a retransmit system that received signal without prior information turn back by estimated phase of the signal to received direction. The RDA can decrease consumption of power by increase of directivity because signal concentrates on received direction compare to omni-direction antenna which transmit power all direction. Generally, the RDA is known to show better performance than the single-antenna system in multi-path environment. However, the RDA occurs performance degradation in serious ISI channel. In this paper, to solve this problem, we propose retrodirective antenna combined with turbo equalizer combined which can compensate serious ISI channel, we increase the BER performance through proposed retrodirective antenna combined with turbo equalizer in serious ISI channel.

디지털 역지향성 안테나 시스템은 사전정보 없이 입사된 신호를 신호의 위상을 추정하여 추정한 각도만큼 다시 돌려서 신호가 수신된 방향으로 재전송하는 시스템이다. 디지털 역지향성 안테나는 모든 방향에 대해 전력을 송출해야 하는 무지향성 안테나에 비해 신호가 수신된 방향으로 신호를 재전송하기 때문에 입사된 방향으로 신호가 집중되어 지향성이 높아지므로 전력의 소모를 줄일 수 있다. 일반적으로 디지털 역지향성 안테나는 다중경로 환경에서 단일 안테나 시스템에 비해 좋은 성능을 보이는 것으로 알려져 있지만, 심각한 ISI의 영향에서는 성능의 저하가 일어난다. 본 논문에서는 이러한 문제점을 극복하기 위해 심각한 ISI의 보상이 가능한 터보등화기를 결합하여 역지향성 안테나를 제안하였다. 제안하는 터보등화기를 이용한 디지털 역지향성 안테나를 통해 심각한 ISI 환경에서의 BER 성능을 개선하였다.

Keywords

References

  1. Van Atta, L. C., "Electromagnetic Reflector," U.S. Patent No. 2,908,002, Oct. 6, 1959.
  2. C. Pon, "Retrodirective array using the heterodyne technique", IEEE Trans. Antennas & Propagat., Vol. 12, No. 2, pp. 176-180, Mar. 1964. https://doi.org/10.1109/TAP.1964.1138191
  3. C. Loadman and Z. Chen, "A Study of Retrodirective Array Performance in the Presence of Multipath", Proceedings Second Annual Conference on Communication Networks and Services, pp. 56-60, May. 2004.
  4. A. Warrier, Z. Chen, and C. Loadman, "Experimental Study of the Retrodirective Antenna Array System in a Multipath Environment," in 6th Ann. Commun. Netw. Services Res. Conf., pp. 449-452, May 5-8, 2008.
  5. M. Tucher, R. Koetter, and A.C. Singer, "Turbo Equalization: Principles and New Results", IEEE Transactions on Communications, Vol.50, No.5, pp. 754-767, May 2002. https://doi.org/10.1109/TCOMM.2002.1006557
  6. R.Y Miyamoto and T. Itoh, "Retrodirective Arrays for Wireless Communications.", IEEE Microwave Magazine, Vol. 3, No. 1, pp. 71-79, March. 2002.
  7. Ji Sun, "A Bandpass Sampling Retrodirective Antenna Array for Time Division Duplex Communications.", M.S thesis, Dalhousie Univ, Halifax, Canada, 2007.
  8. R. Koetter, A.C. Singer, and M. Tuchler "Turbo Equalization," IEEE Signal Processing Mag., Vol. 21, No. 1, pp. 67-80, Jan. 2004. https://doi.org/10.1109/MSP.2004.1267050
  9. Douillard, Catherine; Jezequel, Michel; Berrou, Claude, European Transactions on Telecommunications, vol. 6, no. 5, pp. 507-511, September-October. 1995. https://doi.org/10.1002/ett.4460060506
  10. CHENG Xiang, YUAN. Dongfeng, and YU Xiangming, "The Improvement of Turbo Equalization through Using Turbo Codes", International Conference on Communications, Circuits and Systems (ICCCAS) 2005, Vol 1, pp. 124-127, May. 2005.
  11. Mauri Nissila and Subbarayan Pasupathy, "Soft-Input Soft-Output Equalizers for Turbo Receivers: A Statistical Physics Perspective" IEEE Transactions on Communications, Vol. 55, No. 7, July. 2007.