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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Frequency Synchronization Technique for the Equalization Digital On-Channel Repeater

등화형 디지털동일채널중계기의 송수신 신호 간 주파수 동기화 기술

  • 이용태 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 음호민 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 박성익 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 서재현 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 김흥묵 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 김승원 (한국전자통신연구원 전파방송연구단 방송시스템연구그룹) ;
  • 서종수 (연세대학교 전기전자공학과)
  • Published : 2006.07.01
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Abstract

In this paper, we propose an algorithm which makes the frequency of output signal synchronize with frequency of input signal in Equalization Digital On-channel Repeater (EDOCR) system which was proposed to overcome the disadvantage of conventional Digital On-Channel Repeater (DOCR). Also, we verify the algorithm by using the mathematical equivalent model and analysis the performance by implying the algorithm to EDOCR. The main idea is to use the frequency offset information, which comes from carrier recovery in the receiving part of EDOCR, when the demodulated symbol is re-modulated in transmitting part. Based on the proposed algorithm, EDOCR not only makes the output signal synchronized with input signal in frequency but also emit the output signal which satisfies the ATSC transmission standard without additional equipments such as Global Positioning System (GSP).

본 논문에서는 ATSC 지상파 디지털TV 방송신호를 중계하는 EDOCR 시스템에서 송수신신호의 주파수 동기를 위해 제안된 알고리즘에 대해 기술한다. 또한 수학적 등가모델을 사용하여 제안 알고리즘을 검증하고 제안 알고리즘을 적용한 EDOCR시스템의 성능을 분석하였다. 제안하는 알고리즘은 주 송신신호의 동기복원 과정에서 획득한 주파수 오차정보를 재 변조 과정에 사용함으로써 GPS와 같은 별도의 부가 장치 없이 송수신신호의 주파수를 일치시킬 수 있고, ATSC 송신신호 규격을 만족시키는 재전송신호를 발생시킬 수 있다.

Keywords

References

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