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

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

DOI QR Code

OFDM의 심벌 타이밍 옵셋 추정을 위한 1심벌 옵셋의 훈련심벌 사용법과 CP 출력조절법

Symbol timing Offset Estimation for OFDM Using the 1 Symbol Offset Training Symbol and Controled CP Power

  • 옥윤철 (영남이공대학교 전자정보계열) ;
  • 하영호 (경북대학교 IT대학 전자공학부)
  • Ock, Youn Chul (Div. of Electronics & Information Engineering, Yeungnam College of Science & Technology) ;
  • Ha, Yeong Ho (School of Electronics Engineering, Kyungpook National University)
  • 투고 : 2013.07.12
  • 심사 : 2013.11.20
  • 발행 : 2013.12.25
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

이 논문에서는 OFDM 시스템의 시간 영역 동기를 위한 2가지 방법을 제안한다. 이것은 심벌타이밍 판정의 모호함의 원인이되는 플레토와 사이드로브를 제거하기 위하여 부 심벌간에 1심벌 옵셋을 두고 타이밍 메트릭을 구하는 방법과 플레토 현상을 경감시킬 수 있는 전력감소지수(Reduction Factor, ${\rho}$), 제동상수(Break Constant, ${\beta}_k$) 그리고 심벌이식깊이(Implant Depth, ${\delta}_I$)등의 파라메터를 사용하여 CP(Cyclic Prefix) 구간의 전력을 수정하는 방법이다. 제안된 2가지 방법은 기존에 제안된 심벌타이밍 동기화기법들과 컴퓨터모의시험을 통해서 성능평가가 이루어졌으며, 제안된 방법들은 다중경로의 레일레이 페이딩채널에서 기존의 시스템에 비해서 더 우수한 통계적 특성을 나타내었다.

This paper contains two algorithms proposed for synchronization in OFDM system. The first is having 1 symbol offset while calculating the timing metric, and the second is introduced in new parameter such as Reduction Factor(${\rho}$), Break Constant(${\beta}_k$) and Implant Depth(${\delta}_I$) in order to control the power of CP(Cyclic Prefix) area. Two proposed method are evaluated performance with conventional methode, and than the result of simulation show proposed methods is better than conventional methode while it experience into multipath fading channel.

키워드

참고문헌

  1. T.Pollet, M.van Bladel, and M.Moeneclaey, BER sensitivity of OFDM systems to carrier frequency offset and wiener phase noise, IEEE Trans. On Commun., vol. 43, no 2/3/4, pp. 191-193, Feb./Apr. 1995. https://doi.org/10.1109/26.380034
  2. T.M. Schmidl and D.C. Cox, Robust frequency and timing synchronization for OFDM, IEEE Trans.Commun., Vol. 45, pp. 1613-1621, Dec. 1997.) https://doi.org/10.1109/26.650240
  3. H. Minn, M. Zeng, and V.K. Bhargava, On timing offset estimation for OFDM systems, IEEE trans. Commun., vol. 4, pp. 242-244, July 2000.
  4. Byungjoon Park, Hyunsoo Choen, Eunseok Ko,Changeon Kang, et al., A novel timing estimation method for OFDM systems, IEEE Commun. Lett., vol. 7, no. 5, pp. 53-55, May 2003.
  5. Seung Duk Choi, Jung Min Choi, and Jae Hong Lee, An Initial Timing Offset Estimation Method for OFDM Systems in Rayleigh Fading Channe,
  6. Guo Yi, Liu Gang and Ge Jianhua Novel Time and Frequency Synchronization Scheme for OFDM Systems IEEE Transactions on Consumer Electronics, Vol. 54, No. 2, MAY 2008.
  7. S.B. Weinsten, Data transmission by frequency division multiplexing using the discrete Fourier transform, IEEE Trans. Commun. Technol., vol COM-19, no. pp.628-634, Oct. 1971.
  8. JJVan de Beek,M sandell, M Isaksson, and P.O. Borjesson, "ML estimation of time and frequency offset in OFDM system," IEEE Trans. Commun., vol. 45, no. 7, pp. 1800-1805, July 1997.
  9. COST 207, "Digital land mobile radio communications," Office for Official Publications of the European Communities, Final Report, Luxemburg, 1989.

피인용 문헌

  1. Integer Frequency Offset Estimation using PN Sequence within Training Symbol for OFDM System vol.51, pp.6, 2014, https://doi.org/10.5573/ieie.2014.51.6.290