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

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

Turbo Coded OFDM for Digital Audio Broadcasting System

디지털 오디오 방송을 위한 터보 부호화된 OFDM

  • Kim, Han-Jong (School of Information Technology Electronics Engineering, Korea University of Technology and Education)
  • 김한종 (한국기술교육대학교 정보기술공학부)
  • Published : 2001.11.25
Download PDF
⟨ Previous Next ⟩

Abstract

The Pan-European Digital Audio Broadcasting(DAH) system's performance is characterized and improved with the aid of turbo codec. From the fact that the first bit among the four coded bits at the RCPC coding defined in the Eureka 147 DAD system is not. punctured and always transmitted, this paper proposes a new turbo coded DAB system model that replaces the existing RCPC codec by a turbo codec without modifying the puncturing procedure and puncturing vectors defined in the standard DAB system for compatibility. The performance of a new system is compared to that of the conventional system under the Rician fading channel and the Rayleigh fading channel in conjunction with DAD transmission mode I and III suitable for the terrestrial single frequency network and satellite broadcasting.

본 논문에서는 펑쳐드 콘볼루션 부호기와 연관정 비터비 복호기를 사용하는 기존의 COFDM DAB 시스템에서 부호 율이 1/4인 모체부호로부터 부호화 된 4비트 중 처음 한 비트는 펑쳐링되지 않고 언제나 전송된다는 사실에 근거하여 기존 COFDM DAB 시스템에서 정의된 펑쳐링 절차를 수정함이 없이 터보 부호를 적용한 TCOFDM(Turbo Coded OFDM) DAB 시스템 모델을 제안한다. COFDM DAB 시스템에 터보 부호기를 적용하기 위해 유효 자유거리가 최대인 터보 부호기를 설계하여, 기존의 펑쳐링 과정을 수정함이 없이 터보 부호기로 대체하기 위해 새로운 펑쳐링 과정을 정의한다. 또한 제안된 터보 부호기에 대한 복호기 구조를 제안하고 DAB 시스템에서 정의된 네 가지 전송모드 중에서 단일 주파수망(SFN) 방송 시스템 구성에 유리한 전송모드 I과 위성방송에 적합한 전송모드 III에 대해서 기존의 COFDM DAB 시스템과 제안된 TCOFDM DAB 시스템의 성능을 주파수 선택적 라이시안 페이딩 채널 및 주파수 선택적 레일레이 페이딩 채널 환경에서 컴퓨터 시뮬레이션을 통해 비교, 분석하여본다.

Keywords

References

  1. ETSI, Digital audio broadcasting (DAB) to mobile, portable and fixed receivers, ETS 300 401, May 1997
  2. L. Thibault and M. T. Le, 'Performance Evaluation of COFDM for Digital Audio Broadcasting:Part I,' IEEE trans, On Broadcasting, vol. 43, pp. 64-75, March1997 https://doi.org/10.1109/11.566826
  3. K. Taura and H. Kato, 'A Digital Audio Broadcasting(DAB) Receiver,' IEEE trans. On Consumer Elec, vol. 42, pp.322-326, Aug. 1996 https://doi.org/10.1109/30.536126
  4. U. Liebenow and G. Zimmermann, 'Investigations of Single Frequency Networks for Digital Mobile Radio Systems Based on COFDM,' in VTC'98, pp. 2227-2231, 1998 https://doi.org/10.1109/VETEC.1998.686153
  5. J. A. Huisken, F. A. M. Laar, M. J. G. Bekooij, G. C. M. Gielis, P. W. F. Gruijters and F. P. J. Welten, 'A Power-Efficient Single-Chip OFDM Demodulator and Channel Decoder for Multimedia Broadcasting,' IEEE J. of Solid State Circuit, vol. 33, pp.1793-1798, Nov. 1998 https://doi.org/10.1109/4.726579
  6. M. Alard and R. Lassalle, 'Principles of Modulation and Channel Coding for Digital Broadcasting for Mobile Receivers,' EBU Tech. Rev. No. 224, pp. 168-190, August 1987
  7. W. Y. Zou and Y. Wu, 'COFDM: An Overview,' IEEE Trans. Broadcasting vol. 41, No. 1, pp. 1-7, March 1995 https://doi.org/10.1109/11.372015
  8. C. Berrou and A. Glavieux, 'Near Optimum Error Correcting Coding and Decoding:Turbo-Codes,' IEEE trans. On Comm, vol. 44, pp. 1261-1271, Oct. 1996 https://doi.org/10.1109/26.539767
  9. C. S. Lee, S. Vlahoyiannatos and L. Hanzo, 'Satellite Based Turbo-Coded, Blind Equalized 4-QAM and 16 QAM Digital Video Broadcasting,' IEEE trans. On Broadcasting, vol. 46, pp. 23-33, March 2000 https://doi.org/10.1109/11.845862
  10. V. Kuhn, 'Evaluating the Performance of Turbo Codes and Turbo Coded Modulation in a DS-CDMA Environment,' IEEE JSAC, vol. 17, pp. 2138-2147, Dec. 1999 https://doi.org/10.1109/49.814830
  11. D. Divsalar and F. Pollara, 'Turbo Codes for PCS Applications,' in ICC'95, Seattle, Washington, June, 1995 https://doi.org/10.1109/ICC.1995.525138
  12. H. J. Kim, 'Turbo Coded Orthogonal Frequency Division Multiplexing for Digital Audio Broadcasting,' in ICC'00, New Orleans, pp. 420-424, June 2000 https://doi.org/10.1109/ICC.2000.853352
  13. M. C. Reed and S. S. Pietrobon, 'Turbo-Code Termination Schemes and a novel alternative for Short Frames,' in PIMRC'96, vol. 2, pp. 354-358, Oct, 1996 https://doi.org/10.1109/PIMRC.1996.567415
  14. D. Divsalar and F. Pollara, 'On the Design of Turbo Codes,' TDA Progress Report, Nov. 1995
  15. L. R. Bahl, J. Cocke, F. Jelinek and J. Raviv, 'Optimal Decoding of Linear Codes for Minimizing Symbol Error Rate,' IEEE Trans. Inform. Theory, vol. IT-20, pp. 218-287, Mar. 1974
  16. P. Jung, 'Comparison of Turbo-Code Decoders Applied to Short Frame Transmission Systems,' IEEE JSAC, vol. 14, pp, 530-537, April 1996 https://doi.org/10.1109/49.490238
  17. M. Reed and J. Asenstorfer, 'A Novel Variance Estimator for Turbo-Code Decoding,' in ICT'97, pp. 173-178, April 1997
  18. H. Goldman, 'Mathematical Analysis of the Three-Ray Dispersive Fading Channel Model,' IEE Proceedings, vol. 138, pp.87-94, April 1991
  19. C. Loo and N. Secord, 'Computer Models for Fading Channels with Application to Digital transmission,' IEEE Trans. on Vehi. Tech., vol. 40, pp.700-707, Nov. 1991 https://doi.org/10.1109/25.108380
  20. ETSI, Digital broadcasting systems for television, sound and data services , DRAFT pr ETS 300 744, March 1996