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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance Enhancement of the Feedback Interference Canceller for the EDOCR in the ATSC DTV System

ATSC DTV 방송용 중계기 궤환간섭 제거 성능 개선

  • 이영준 (부산대학교 전자전기컴퓨터공학과 통신 및 신호처리 연구실) ;
  • 박성익 (한국전자통신연구원) ;
  • 김흥묵 (한국전자통신연구원) ;
  • 김형남 (부산대학교 전자전기컴퓨터공학과 통신 및 신호처리 연구실)
  • Received : 2013.08.09
  • Accepted : 2013.10.25
  • Published : 2013.11.30
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Abstract

We propose two feedback interference cancellers(FICs) to improve the performance of the equalization digital on-channel repeater(EDOCR) with the FIC for the ATSC DTV broadcasting system. The FIC estimates the feedback channel between Tx. and Rx. antennas of the repeater by cross-correlating the reference signal and the feedback signal. Since there is a DC pilot which ruins the white property of the ATSC DTV signals, the FIC cannot estimate the feedback channel accurately. To solve the problem, the structural method which uses an additional DC pilot free reference for feedback channel estimation and the algorithmic method based on the digital signal processing which whitens the ATSC DTV signals and performs the feedback cancellation in the whitened signal domain. Simulation results show that the proposed two FICs show better feedback cancellation performance than the conventional FIC.

본 논문에서는 ATSC DTV 시스템에서 독립적인 궤환간섭 제거기(Feedback Interference Canceller: FIC)를 가지는 등화형 디지털 동일채널 중계기(Equalization Digital On-Channel Repeater: EDOCR)의 궤환간섭 제거 성능 향상을 위한 새로운 구조의 FIC를 제안한다. FIC는 기준신호와 궤환되는 신호의 상관관계를 이용하여 궤환채널을 추정하는데, ATSC DTV 방송 신호는 신호의 상관관계 특성을 저해하는 DC 파일럿을 포함하고 있으므로 FIC로 하여금 정확한 궤환채널 추정을 수행하지 못하게 한다. 이러한 문제를 해결하기 위해, EDOCR과 FIC의 결합 구조에 기반하여 EDOCR에서 신호 재변조 시 DC 파일럿을 포함하지 않는 기준신호를 추가적으로 생성하여 궤환채널 추정에 사용하는 DC 파일럿 없는 기준신호 기반 FIC와 디지털 신호처리를 통해 입력신호들을 백색화하여 DC 파일럿을 제거한 후 궤환채널을 추정하는 백색화된 신호 영역 FIC를 제안한다. 모의실험을 통해, 제안된 두 FIC 구조 모두 기존의 상관관계 제거형 FIC에 비해 우수한 궤환간섭 제거 성능을 가짐을 보인다.

Keywords

References

  1. A. Mattsson, "Single frequency networks in DTV," IEEE Trans. Broadcast., vol. 51, no. 4, pp. 413-422, Dec. 2005. https://doi.org/10.1109/TBC.2005.858419
  2. K. Salehian, M. Guillet, B. Carson, and A. Kennedy, "On-channel repeaterfor digital television broadcasting service," IEEE Trans. Broadcast., vol. 48, no. 2, pp. 97-102, June 2002. https://doi.org/10.1109/TBC.2002.1021274
  3. ATSC, "Standard A/110: Synchronization Standard for Distributed Transmission," Advanced Television Systems Committee, Washington D.C., July 2004.
  4. ATSC, "Recommended Practice A/111: Design of Synchronized Multiple Transmitter Networks," Advanced Television Systems Committee, Washington D.C., Sep. 2004.
  5. S. W. Kim, Y.-T. Lee, S. I. Park, H. M. Eum, J. H. Seo, and H. M. Kim, "Equalization digital on-channel repeater in single frequency networks," IEEE Trans. Broadcast., vol. 52, no. 2, pp. 137-146, June 2006. https://doi.org/10.1109/TBC.2006.875651
  6. Y.-T. Lee, S. I. Park, H. M Eum, J. H. Seo, H. M. Kim, S. W. Kim, and J. S. Seo, "A design of equalization digital on-channel repeater for single frequency network ATSC system," IEEE Trans. Broadcast., vol. 53, no. 1, pp. 23-37, Mar. 2007. https://doi.org/10.1109/TBC.2006.886453
  7. H. M. Kim, S. I. Park, J. H. Seo, H. Eum, Y.-T. Lee, S. I. Lee, and H. Lee, "Modulation and pre-equalization method to minimize time delay in equalization digital on-channel repeater," IEEE Trans. Broadcast., vol. 54, no. 2, pp. 249-256, June 2008. https://doi.org/10.1109/TBC.2008.921371
  8. J. K. Lee and J. G. Kim, "Multi-level correlation LMS algorithm for digital on-channel repeater system in digital TV broadcasting system environment," J. Korean Soc. Broadcast Eng. (KOSBE), vol. 15, no. 1, pp. 63-75, Jan. 2010. https://doi.org/10.5909/JBE.2010.15.1.063
  9. A. Wiewiorka and P.N. Moss, "Digital on-channel repeater for DAB," BBC R&D White Paper 120, Sep. 2005.
  10. H. Hamazumi, K. Imamura, N. Iai, K. Shibuya, and M. Sasaki, "A study of a loop interference canceller for the relay stations in an SFN for digital terrestrial broadcasting," in Proc. IEEE GLOBECOM 2000 Conf., pp. 167-171, San Francisco, U.S.A., Dec. 2000.
  11. K. Imamura, "Verification of performance of coupling loop interference canceller for on-air relay in an SFN on-channel repeater for ISDB-T," in Proc. 56th Annu. IEEE Broadcast. Symp. (BTS 2006), Washington D.C., U.S.A., Sep. 2006.
  12. K. M. Nasr, J. Cosmas, M. Bard, and J. Gledhill, "Performance of an echo canceller and channel estimator for on-channel repeaters in DVB-T/H networks," IEEE Trans. Broadcast., vol. 53, no. 3, pp. 609-618, Sep. 2007. https://doi.org/10.1109/TBC.2007.903612
  13. Y.-J. Lee, J.-B. Lee, S. I. Park, H. M. Kim, Y.-T. Lee, K. S. Son, and H.-N. Kim, "Correlation canceling-type feedback canceler based on decision-directed pilot symbols for T-DMB repeaters," IEEE Trans. Broadcast., vol. 58, no. 3, pp. 499-507, Sep. 2012. https://doi.org/10.1109/TBC.2012.2196322
  14. S. Haykin, Adaptive filter theory, 4th Ed., Prentice hall, 2002.
  15. K.-H. Suh, Y.-J. Lee, S. I. Park, H. M. Eum, H. M. Kim, and H.-N. Kim, "Feedback cancellation with a pilot-free reference for the ATSC terrestrial DTV repeaters," in Proc. 59th Annu. IEEE Broadcast. Symp., Alexandria, U.S.A., Oct. 2009.
  16. J. Lee, Y.-W. Suh, J.-Y, Choi, and J. S. Seo, "VSB based digital on-channel repeater with interference cancellation system," ETRI J., vol. 33, no. 5, pp. 670-678, Oct. 2011. https://doi.org/10.4218/etrij.11.0110.0539
  17. Mackenzie, ABERT, and SET, "General decription of laboratory tests,", DTV Field Test Report in Brazil, July. 2000.