Opencable 방식과 DVB-C 방식의 전송성능에 관한 연구

Studies on the Transmission Performance of Opencable and CVB-C

  • 이재련 (경희대학교 전자정보학부 멀티미디어전송 연구실) ;
  • 손원 (경희대학교 전자정보학부 멀티미디어전송 연구실)
  • 발행 : 2002.01.01

초록

이 논문은 미국과 유럽에서 디지털 CATV (Community Antenna Television) 전송방식으로 각각 채택되고 있는 OpenCable 방식과 DVB-C (Digital Video Broadcasting-Cable System) 방식의 전송성능을 모의실험을 통하여 동일한 채널환경에서 비교 및 분석하였다. 두 방식을 공정하게 비교하기 위하여, 랜던잡음과 CTB (Composite Tripple Beats) 잡음을 신호손상요소로서 포함한 채널 모형을 고려하였으며, 가변 인터리빙 깊이 기능을 가지는 OpenCable 전송시스템은 여러 가지 인터리빙 깊이에 대한 전송성능을 분석하였다. 전송선능을 비교하기 위하여 각 전송방식에 대한 송수신 시스템을 소프트웨어로 구현한 다음, C/N값의 증가에 따른 BER(Bit Error Rate) 값을 비교 및 분석하였다. 모의실험결과, 각 잡음에 대하여 BER 값 ${10}^{-6}$을 얻기 위한 C/N 값이 64-QAM 모드에서는 OpenCable 방식이 DVB-C 방식보다 약 1.2 dB 정도 낮았으며, 256-QAM 모드에서는 두 방식이 유사하다는 결과를 얻었다.

This paper compares and analyzes and analyzes the transmission performance of the OpenCable system and the DBD-C system which are adopted as the digital CATV transmission standard in U.S.A. and Europe respectively through computer simulation under the same channel environment. We considered the channel environment including the random noise and the CTB (Composite Tripple Beats) noise as channel impairments in order to compare the two standard fairly. Additionally, we analyzed the transmission performance of the OpenCable system for the various interleaving depths. We implemented each transmission system by software, and we analyzed BER values with respect to the C/N in order to compare their transmission performance. As a result of the computer simulation, to get the BER of ${10}^{-6}$ the OpenCable system requires 1.2 dB kiwer C/N than the DVB-C system in the 64-QAM mode, and the two system require similar C/N in the 256-QAM mode.

키워드

참고문헌

  1. ITU-T Recommendation J.83, Digital Multi programme Systems for Television Sound and Data Services for Cable Distribution, April 1997
  2. SCTE DVS/031r5, Digital Video Transmission Standard for Cable Television, July 2000
  3. EN 300 429 v1.2.1, Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for cable systems, April 1998
  4. K. J. Kerpez, 'A Comparison of QAM and VSB for Hybrid Fiber/Coax Digital Trans-mission,' IEEE Transactions on Broadcasting, vol. 41, No. 1, March 1995, pp. 9-16 https://doi.org/10.1109/11.372016
  5. K. Maeda and K. Utsumi, 'Bit-Error Rate of M-QAM Signal and Its Analysis Model for Composite Distortions in AM/QAM Hybrid Transmission', IEEE Transaction on Commu-nications, Vol. 47, No. 8, August 1999, pp. 1173-1180 https://doi.org/10.1109/26.780453
  6. W. I. Way, Broadband Hybrid Fiber/Coax Access System Technologies, Academic Press, San Diego, 1999
  7. Error Control Coding Hand-book, Linkabit Corp., San Diego, July 15, 1976
  8. H. K. Wolf and E. Zehavi, 'P2 codes: Pragmatic trellis codes utilizing punctured convolutional codes,' IEEE Communications Magazine, vo1.25, pp. 12-21, February 1987
  9. Shu Lin and Daniel J. Costello, Jr., Error Control Coding: Fundamental and Applications, Prentice Hall, 1983