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

  • 제38B권3호
  • /
  • Pages.172-179
  • /
  • 2013
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  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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비대칭 채널에서의 네트워크 코딩 기반 양방향 릴레이 전송 기법

Network-Coded Bi-Directional Relaying Over an Asymmetric Channel

  • 류현석 (고려대학교 전기전자파공학과 무선정보시스템공학 연구실) ;
  • 이준석 (LG전자) ;
  • 강충구 (고려대학교 전기전자파공학과 무선정보시스템공학 연구실)
  • 투고 : 2012.12.31
  • 심사 : 2013.03.04
  • 발행 : 2013.03.29
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초록

본 논문에서는 양방향 링크의 채널 상태와 트래픽 부하가 비대칭적인 채널에서 네트워크 코딩을 적용하는 기법과 그 방식에 따른 성능에 대해서 살펴본다. 이러한 양방향 링크의 비대칭성을 반영하기 위해 패딩후 네트워크 코딩(Network Coding after Padding: NaP) 방식과 분할 후 네트워크 코딩(Network Coding after Fragmentation: NaF) 방식을 고려한다. NaP 방식은 지금까지 트래픽 부하의 비대칭성만을 반영하기 위해 고려된 바 있으며, 본 논문에서는 실제로 채널의 상태를 동시에 고려할 경우에는 NaP 방식이 갖는 기존의 이득이 오히려 열화되는 것을 보인다. 또한, NaF 방식이 일반적인 양방향 링크 기법뿐만 아니라 NaP 방식보다 항상 성능이 좋다는 것을 보인다.

In this paper, we consider network-coded bi-directional relaying (NCBR) schemes over an asymmetric channel, in which bi-directional links have the different channel quality, as well as the asymmetric traffic load. In order to deal with asymmetric nature, two different types of NCBR schemes are considered: network coding after padding (NaP) and network coding after fragmentation (NaF). Even if NaP has been known as only a useful means of dealing with the asymmetry in traffic load up to now, our analysis shows that its gain can be significantly lost by the asymmetry in channel quality, under the given bit error performance constraint. Furthermore, it is shown that NaF always outperforms NaP, as well as traditional bi-directional relaying scheme.

키워드

참고문헌

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