Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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A Design of Adaptive Equalizer for Terrestrial Digital Television Receivers

지상파 디지털 TV 수신기의 적응등화기 설계

  • 정진희 (삼성전자 디지털미디어 연구소) ;
  • 김정진 (삼성전자 디지털미디어 연구소) ;
  • 권용식 (삼성전자 디지털미디어 연구소) ;
  • 장용덕 (삼성전자 디지털미디어 연구소) ;
  • 정해주 (삼성전자 디지털미디어 연구소)
  • Published : 2003.06.01
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Abstract

This paper describes a structure of adaptive equalizer to improve reception performance of ATSC digital television (DTV) for 8-VSB receivers. There are many strong and dynamic echoes affecting reliable reception of DTV signal. Conventional DFE based least mean square (LMS) algorithm is readily implemented and has good Performance. There are still problems to be solved, however, in handling strong echoes and indoor reception. In this paper, structure of adaptive equalizer to mitigate these Problems in strong multipath interference conditions and indoor reception environment is first presented. Methods to reduce error propagation effects on DFE and initialization scheme of filter coefficients for fast convergence are then introduced. Computer simulation results prove that an adaptive equalizer with proposed design methods can combat with Brazil Ensemble and the Threshold of Visibility(TOV) is improved.

본 논문은 우리나라의 지상파 디지털 TV방식인 ATSC (Advanced Television System Committee) 8-VSB (Vestigial Sideband) 시스템의 수신부 가운데 등화부에 해당되는 DFE (Decision Feedback Equalizer)에 관한 것으로서, DFE 구조의 전반적인 개요와 블라인드 알고리즘에 대한 성능 분석결과를 서술한다. 특히, 다중경로, 도플러 천이(Doppler Shift), 건물 벽에 의한 신호의 감쇄 등의 영향으로 수신이 어려운 실내수신 환경에서의 수신 성능개선을 위해 최적화된 등화기의 구조를 제시하고, 등화기와 TCM(Trellis Coded Modulation)연동방법 및 필터계수 초기화 알고리즘 등을 구현한 후 모의 실험을 통한 성능 분석결과를 제시한다.

Keywords

References

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