Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Image Transmission Using Designed Source-Channel Combined Coder for Mobile Communication Systems

이동통신 시스템을 위한 소스코더와 결합된 채널코딩방법에 의한 영상전송

  • 이병길 ((株) 데이콤綜合硏究所) ;
  • 박판종 ((株) 데이콤綜合硏究所) ;
  • 조현욱 ((株) 慶北大學校 電子工學科) ;
  • 박길흠 ((株) 慶北大學校 電子工學科)
  • Published : 2000.01.01
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Abstract

In this paper, we present the efficient image transmission system using designed source-channel combined coder in W-CDMA mobile communication system. In proposed schemes, we decompose the wavelet transformed hierarchical band-images into some types of different size blocks which have different properties in error sensitivity. The RS(Reed-Solomon) coder with different coding rate is used for each decomposed source blocks which has different importance. In addition, we combine retransmitted error frames in Truncated Hybrid Type I ARQ. The proposed algorithm shows efficient image transmission methods because it is not much degraded in PSNR compared with the existing not combined source-channel coder in erroneous wireless channel.

본 논문에서는 광대역 코드분할 다중접속방식(W-CDMA : Wideband-Code Division Multiple Access)을 이용하는 전력제어된 이동통신 시스템에서 영상전송을 위한 채널모형을 설계하고, 영상 소스 데이터와 결합된 채널 부호화에 대한 설계를 하고 전송성능을 검증하고자 한다. 웨이브릿 변환 알고리즘을 이용하여 각 대역별 중요도에 따라 차등적인 크기의 블록 단위로 세분화하여 독립적으로 부호화 하였고, 영상정보의 전송에러에 대한 감응도를 고려하여 RS(Reed-Solomon)부호화시에 각각의 신호대역에 따라 분리된 RS 부호화율을 적용하여 W-CDMA 페이딩 채널 에러에 대하여 동일한 데이터율로서 더 나은 PSNR 이득을 얻도록 하였다. 또한 Truncated Hybrid Type I ARQ 방식에 의한 재전송과정에서 재전송 프레임간 Combine하여 성능을 향상시킬 수 있는 장점이 있다. 시뮬레이션을 통해 차세대 영상전송 시스템으로서 기존의 독립적인 영상-채널 부호화방식에 비해 무선채녈의 열화에서도 성능의 감소가 크지 않아 효과적인 영상전송 방법임을 알 수 있었다.

Keywords

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