Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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The Analysis of TxID Signal's Effect to Legacy Receivers in ATSC DTV System

ATSC DTV 시스템에서 TxID 신호가 기존 수신기에 미치는 영향 분석

  • 목하균 (한국방송공사 방송기술연구소) ;
  • 박성익 (한국전자통신연구원 방송시스템연구부) ;
  • 이재권 (한국방송공사 방송기술연구소) ;
  • 유호진 (한국방송공사 방송기술연구소) ;
  • 김홍묵 (한국전자통신연구원 방송시스템연구부)
  • Received : 2010.03.11
  • Accepted : 2010.04.28
  • Published : 2010.05.30
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Abstract

When we implement the single frequency network (SFN) in ATSC terrestrial DTV system, there is an interference problem to DTV receivers due to the use of same frequency channel among transmitters and repeaters. To resolve this problem, it is recommended to adopt the transmitter identification signals in transmitting equipments. In this paper, we analyzed the influence suffered by legacy DTV receivers when the TxID signal is added to the DTV transmitting signals and the results were further verified by computer simulation, laboratory test and field test. The above tests show that if the TxID signal is added to the level of -30dB compared to the original DTV signal, the TOV(Threshold Of Visibility) increment in legacy receivers is about 0.17 dB. It means that we can insert and transmit the TxID signal in ATSC terrestrial DTV system without making the negative effect to the legacy DTV receivers.

ATSC 방식의 지상파 디지털 TV 방송에서는 단일 주파수 망 구성 시 송신기들과 중계기들이 동일한 주파수를 사용함에 따라 수신기에서 간섭 문제가 발생한다. 이를 해결하기 위하여 ATSC 에서는 각 송신기 및 중계기에 송신기 식별 (TxID: Transmitter Identification) 신호를 할당하여 송신 및 중계 신호에 부가하여 전송하도록 권고하고 있다. 본 논문에서는 기존 DTV 신호에 부가되어 전송되는 TxID 신호가 기존의 상용 수신기에 미치는 영향을 전산실험, 실험실 테스트, 그리고 필드 테스트를 통해 살펴본다. 이러한 테스트 결과에 의하면 TxID 신호가 기존 DTV 신호보다 30 dB 이하의 삽입레벨로 부가하여 전송될 때 상용 DTV 수신기의 TOV(Threshold of Visibility) 의 증가량은 0.17 dB 보다 작았다. 이것은 TxID 신호를 30 dB이하로 부가하여 전송하면 기존의 상용 수신기에 미치는 영향이 거의 없음을 의미한다.

Keywords

References

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