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

  • 제40권9호
  • /
  • Pages.1699-1709
  • /
  • 2015
  • /
  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지
DOI QR코드

DOI QR Code

고속 이동체를 위한 상향링크 주파수 옵셋 보상 방법

Uplink Frequency Offset Compensation Scheme for High-Speed Moving Terminals

  • Choi, Sung-woo (Electronics and Telecommunications Research Institute, Chungnam National University Department of Information and communication) ;
  • Kim, Ilgyu (Electronics and Telecommunications Research Institute) ;
  • Ahn, Jae Min (Chungnam National University Department of Information and communication)
  • 투고 : 2015.08.13
  • 심사 : 2015.09.03
  • 발행 : 2015.09.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

고속열차와 같은 이동체는 높은 도플러 주파수 천이가 발생하고, 이에 따라 높은 캐리어 주파수 옵셋이 생겨서 이를 보상하지 않으면 통신 성능의 열화를 가져온다. OFDMA 방식의 다중 단말 접속 방식에서 기지국이 상향링크 주파수 옵셋을 보상하기 위해서 복잡한 하드웨어가 필요하다. 본 논문은 기지국의 부담을 줄이고, 간단하게 주파수 옵셋 추정 및 보상을 하기 위한 방법을 제안한다. 제안한 방법은 주파수 옵셋 보상을 위해 하드웨어로 단말은 추가로 곱셈기 하나만 필요하여, 기지국 직접 보상에 비해서 많은 하드웨어를 감소시킬 수 있다. 제안한 방법은 밀리미터 통신 기반 고속철도 통신 시스템 환경에서 시뮬레이션을 수행하였다. 시뮬레이션을 통해서 제안한 방법이 5G 이동통신의 요구사항인 500 km/h 속도의 높은 도플러 주파수 천이 상황에서도 효과적으로 동작함을 확인 하였다.

Moving terminals like high-speed-train undergo high Doppler frequency shift, and this leads to carrier frequency offsets that have to be compensated to avoid degradation of communication performance. In multiple access mechanism like OFDMA, base-stations need complex hardware to compensate the uplink frequency offset. In this paper, we propose a method, which can reduce burden of the base-station and makes frequency offset estimation and compensation simple. This method contains transmitting new synchronization signal, estimating frequency offsets in base-station, transmitting feedback information to terminal, and compensating the offset in uplink transmission. Simulation results show the proposed method operates well in high Doppler frequency shift conditions of 500 km/h which is the requirements of 5G mobile communication.

키워드

참고문헌

  1. H. S. Cheong, et al., "Trend analysis of moving wireless backhaul technologies for mobile hotspot networks," Electron. Telecommun. Trend, vol. 30, no. 1, pp. 12-20, Feb. 2015.
  2. A preliminary draft new Recommendation ITU-R M.[IMT.VISION], Framework and overall objectives of the future development of IMT for 2020 and beyond, Auckland, New Zealand, Feb. 2015.
  3. S. G. Park, J. W. Lee, and T. H. Jeon, "Performance comparison of space-time block coding in high-speed railway channel," J. KICS, vol. 39C, no. 3, pp. 291-297, 2014. https://doi.org/10.7840/kics.2014.39C.3.291
  4. J. Choi, C. Lee, H. W. Jung, and Y. H. Lee, "Carrier frequency offset compensations for uplink of OFDM-FDMA systems," IEEE Commun. Lett., vol. 4, No. 12, pp. 414-416, Dec. 2000. https://doi.org/10.1109/4234.898725
  5. H. Cheon, "Frequency offset estimation for high speed users in E-UTRA uplink," in Proc. 18th Annu. IEEE Int. Symp. Personal, Indoor Mob. Radio Commun., Athens, Greece, Sept. 2007.
  6. P. Bertrand, "Frequency offset estimation in 3G LTE," in Proc. VTC, Taipei, Taiwan, May 2010.
  7. S. Choi, I. G. Kim, and D. J. Kim, "Uplink pilot signal design for mobile wireless backhaul," J. KICS, vol. 40, no. 6, pp. 1005- 1013, 2015. https://doi.org/10.7840/kics.2015.40.6.1005
  8. ITU-R Recommendation P.525.2, Calculation of free-space attenuation, 1994.
  9. 3GPP TS 36.104 v8.4.0, 2008-12, Technical specification group radio access network; evolved universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)
  10. Z. Muhi-Eldeen, L. P. Ivrissimtzis, and M. Al-Nuaimi, "Modelling and measurements of millimetre wavelength propagation in urban environments," IET Microw. Antennas Propag., vol. 4, no. 9, pp. 1300-1309, 2010. https://doi.org/10.1049/iet-map.2009.0431
  11. P. H. Moose, "A technique for orthogonal division multiplexing frequency offset correction," IEEE Trans. Commun., vol. 42, no. 10, pp. 2908-2914, 1994. https://doi.org/10.1109/26.328961
  12. M. Morelli, C. C. J. Kuo, and M.-O. Pun, "Synchronization techniques for orthogonal division multiple access (OFDMA): A tutorial review," in Proc. IEEE, vol. 95, no. 7, pp 1394-1425, Jul. 2007. https://doi.org/10.1109/JPROC.2007.897979
  13. K. J. Kim, K. J. Choi, and K. S. Kim, "DFT-Based channel estimation scheme for the uplink of LTE-A systems," J. KICS, vol. 40, no. 2, pp. 307-309, 2015. https://doi.org/10.7840/kics.2015.40.2.307
  14. Z. Cao, U. Tureli, Y.-D. Yao, and P. Honan, "Frequency synchronization for generalized OFDMA uplink," in Global Telecommun. Conf., vol. 2, pp. 1071-1075, Nov. 2004.
  15. T. Yucek and H. Arslan, "Carrier frequency offset compensation with successive cancellation in uplink OFDMA systems," IEEE Trans. Wirel. Commun., vol. 6, no. 10, pp. 3546-3551, Oct. 2007. https://doi.org/10.1109/TWC.2007.060273
  16. B. Aziz, I. Fijalkow, and M. Ariaudo, "Joint estimation of channel and carrier frequency offset from the emitter, in an uplink OFDMA system," in ICASSP, pp. 3492-3495, Prague, Czech Republic, May 2011.