방송공학회논문지 (Journal of Broadcast Engineering)

  • 제18권3호
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  • Pages.435-444
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  • 2013
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  • 1226-7953(pISSN)
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  • 2287-9137(eISSN)
한국방송∙미디어공학회 (The Korean Institute of Broadcast and Media Engineers)
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향상된 지상파 DTV 채널 프로파일 측정기술

Improved Channel Profile Measurement Technique for ATSC Terrestrial DTV System

  • Lee, Jaekwon (Korean Broadcasting System Technical Research Institute) ;
  • Jeon, Sung-Ho (Korean Broadcasting System Technical Research Institute) ;
  • Kim, Jung-Hyun (Korean Broadcasting System Technical Research Institute) ;
  • Suh, Young-Woo (Korean Broadcasting System Technical Research Institute) ;
  • Kyung, Il-Soo (Korean Broadcasting System Technical Research Institute)
  • 투고 : 2013.01.14
  • 심사 : 2013.04.10
  • 발행 : 2013.05.30
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초록

ATSC (Advanced Television System Committee) 지상파 DTV(Digital Television) 방송시스템은 6 MHz 대역폭을 이용하여 최대 19.2 Mbps의 데이터 전송률을 지원하지만, 멀티패스 페이딩이 발생하는 도심 환경에서는 수신 성능이 급격히 나빠지는 단점을 가지고 있다. 도심 환경에서 DTV 수신기의 성능 열화를 개선하기 위해서는 무엇보다 멀티패스 페이딩 채널을 측정하고 분석하는 것이 중요하다. 하지만 ATSC 지상파 DTV 방송시스템의 8-VSB(Vestigial Sideband Modulation) 변조 방식은 동위상 채널에만 DTV 심볼 데이터를 전송하기 때문에, 직교위상 채널을 예측하지 않으면 정확한 멀티패스 페이딩 채널 측정이 어려워진다. 본 논문에서는 지상파 DTV 방송시스템의 VSB 펄스성형 필터를 이용하여 직교위상 채널을 예측하고, 이를 통해 멀티패스 페이딩 채널을 보다 정확하게 측정하는 DTV 채널 프로파일 측정기술을 제안하고 모의실험을 통해서 성능을 분석하였다.

ATSC terrestrial DTV system can support high data rates for HDTV(High Definition Television) service, but it suffers from significant performance degradation caused by multipath fading. Thus, it is necessary to analyze multipath fading effects in order to enhance the DTV reception performance. Generally, DTV channel profile can be obtained by auto-correlation between reference pseudo random signal and received DTV signal. However, in the ATSC terrestrial DTV system, the estimation performance of DTV channel profile may be decreased due to the VSB modulation features. In this paper, improved DTV channel profile measurement technique is analyzed and proposed.

키워드

참고문헌

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