Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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A Study of Spreading code for Watermarking of TxID of ATSC-DTV

ATSC-DTV의 송신기 식별을 위한 워터마킹용 확산코드에 관한 연구

  • Cha Jae-Sang (Dept. of Media Engineering, Seoul National Univ. of Technology) ;
  • Choi Seong-Jin (Dept. of Media Engineering, Seoul National Univ. of Technology) ;
  • Lee Seon-Hee (Dept. of Media Engineering, Seoul National Univ. of Technology) ;
  • Lee Kwang-Jik (Dept. of Media Engineering, Seoul National Univ. of Technology) ;
  • Lee Yong-Tae (Digital Broadcasting Research Division, Broadcasting System Dept., ETRI) ;
  • Park Goo-Man (Dept. of Media Engineering, Seoul National Univ. of Technology)
  • 차재상 (서울산업대학교 매체공학과) ;
  • 최성진 (서울산업대학교 매체공학과) ;
  • 이선희 (서울산업대학교 매체공학과) ;
  • 이광직 (서울산업대학교 매체공학과) ;
  • 이용태 (한국전자통신연구원 방송시스템연구그룹) ;
  • 박구만 (서울산업대학교 매체공학과)
  • Published : 2006.03.01
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Abstract

In this paper, we proposed a TxID(Transmitter Identification) system using ZCD (Zero Correlation Duration) code as interference-cancelled spread codes for single frequency network of ATSC terrestrial DTV broadcasting. ZCD codes are simply implemented and have ZCD characteristics. Then, Proposal system can fundamentally solve interference problems caused by ICI(Inter Code Interference) and MPI(Multi-Path Interference) which happens in TxID system using spread coding method. Also, those can cancel truncated error which happens at watermarking for TxID since those can remove its period. In this paper, we identified the availability of TxID system applying interference-cancelled ZCD codes by analyzing DER (Detection Error Rate) which is simulated in various interference environments such as AWGN, ICI, and MPI.

본 논문에서는 지상파 디지털 방송시스템의 단일 주파수망 (SFN; Single Frequency Network) 구성을 위해 DTV (Digital Television)의 TxID (Transmitter Identification)용 저간섭 ZCD (Zero Correlation Duration) 확산코드를 제시하였다. ZCD 확산 코드는 코드발생기의 구현이 용이함과 동시에 ZCD 특성을 가짐으로 인해서, TxID에서 발생되는 인접코드 간섭 (ICI; Inter Code Interference) 및 다중경로 간섭 (MPI; Multi-Path Interference) 문제를 확산코딩기법을 이용하여 근원적으로 해결해주는 역할을 하고 있으며, 주기를 가변적으로 조절할 수 있어 TxID를 위한 워터마킹 (Watermarking)시에 발생하는 Truncated error 를 제거할 수 있다. 본 논문에서는 AWGN (Additive White Gaussian Noise) 잡음 및 ICI, MPI와 같은 다양한 간섭환경을 모의실험에 반영하여 도출된 DER (Detection Error Rate) 특성을 분석함으로써, TxID용 저간섭 ZCD 확산코드의 유용성을 입증하였다.

Keywords

References

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