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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지
DOI QR코드

DOI QR Code

Pilot Subcarrier Based Channel Estimation Scheme in IEEE 802.11p Systems

IEEE 802.11p에서 파일럿 부반송파를 이용한 채널추정 기법

  • Ren, Yongzhe (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Park, Dong Chan (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Kim, Suk Chan (Dept. of Electrical and Computer Engineering, Pusan National University)
  • Received : 2015.04.13
  • Accepted : 2015.05.08
  • Published : 2015.05.31
Download PDF
⟨ Previous Next ⟩

Abstract

It has been grown interests of the convergence technologies about communication systems and vehicular industry. Vehicular communications enable a number of infotainment applications to serve cars under high mobility environments. To achieve this goal, a robust and accurate channel estimation scheme is of great importance. This paper proposes an enhanced Decision-Directed channel estimation scheme called PTAU(Pilot Tone Aided Update) for IEEE 802.11p in vehicular communication environment. Existing approaches which use subsequent data symbols to estimate channel response in time domain will lead to the error propagation. In this paper, we use the pilot subcarriers to get initial channel response, then utilize the correlation characteristics to update channel response in frequency domain. Finally, Analysis and simulation results reveal that the proposed scheme outperforms in bit error rate(BER), significantly improve the performance of the estimation.

이동 중의 차량에서 멀티 서비스를 지원받고자 하는 수요가 증가함에 따라 통신시스템과 차량산업을 융합하는 기술에 대한 관심이 증가하고 있다. 이러한 서비스가 성공적으로 수행되기 위해서는 신뢰성 있는 정보의 전달과 우수한 수신성공률이 보장되어야 한다. 따라서 정확한 채널 값을 추정 할 수 있는 기법이 필요하다. 이 논문은 고속주행 환경에서 동작하는 차량용 통신 규격인 IEEE 802.11p에서 시변 채널추정을 위한 PTAU(Pilot Tone Aided Update) 결정지향 기법을 제안한다. 기존의 기법들은 시간영역에서 오류전파가 발생하므로 높은 서비스의 질을 제공하기 어렵다. 이 논문에서는 이러한 문제점의 보완을 위해 파일럿 부반송파들을 사용하였고, 주파수 대역에서 일정한 순서에 따라 추정한 값들을 업데이트시킴을 제안한다. PTAU기법은 기존의 기법들에 비해 낮은 비트오류율을 가져 고속채널에서의 추적 성능을 향상시킴을 검증하였다.

Keywords

References

  1. H. Hartenstein and K. P. Laberteaux, "A tutorial survey on the Vehicular ad hoc networks," IEEE Commun. Mag., vol. 46, no. 6, pp. 164-171, Jun. 2008. https://doi.org/10.1109/MCOM.2008.4539481
  2. S. Kim, "An evaluation of the performance of wireless network in vehicle communication environment," J. KICS, vol. 36, no. 10, pp. 816-822, Oct. 2011. https://doi.org/10.7840/KICS.2011.36A.10.816
  3. C. F. Mecklenbrauker, et al., "Vehicular channel characterization and its implications for wireless system design and performance," in Proc. IEEE, vol. 99, no. 7, pp. 1189-1212, Jul. 2011. https://doi.org/10.1109/JPROC.2010.2101990
  4. J. Wee and Y.-S. Cho, "A modified pilot symbol based channel estimation technique using cross-correlation for OFDM systems," J. KICS, vol. 36, no. 7, pp. 467-474, Jul. 2011. https://doi.org/10.7840/KICS.2011.36C.7.467
  5. IEEE standard for Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks Specific Requirements Part 11, Wireless LAN Medium Access Control and Physical Layer Specifications, IEEE Standard 802.11p, 2010.
  6. W. Cho, "A measurement study of midamble based channel estimation in IEEE 802.11p WAVE system," J. KIECS, vol. 8, no. 5, pp. 733-738, May 2013.
  7. J. A. Fernandez, K. Borries, L. Cheng, B. V. K. Vijaya Kumar, D. D. Stancil, and F. Bai, "Performance of the 802.11p Physical layer in vehicle-to-vehicle environments," IEEE Trans. Veh. Tech., vol. 61, no. 1, pp. 3-14, Jan. 2012. https://doi.org/10.1109/TVT.2011.2164428
  8. Z. Zhao, X. Cheng, M. Wen, L. Yang, and B. Jiao, "Constructed data pilot-assisted channel estimators for mobile environments," IEEE Transportation on ITS, vol. 16 no. 2, pp. 1-11, Apr. 2015.
  9. Z. Zhao, X. Cheng, M. Wen, and B. Jiao, "Channel estimation scheme for IEEE 802.11p standard," Intell. Transportation Syst. Mag., vol. 5, no. 4, pp. 38-49, Oct. 2013. https://doi.org/10.1109/MITS.2013.2270032
  10. J. Medbo, "Radio wave propagation characteristics at 5GHz with modeling suggestions for HIPERLAN/2," ETSI BRAN 3ERIO74A, Jan. 1998.

Cited by

  1. 블라인드 채널에서 수신 신호 분석 기법을 사용한 변조 및 채널 상태 추정 알고리즘 vol.41, pp.11, 2015, https://doi.org/10.7840/kics.2016.41.11.1406