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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance Enhancement using Hierarchical Modulation in Distributed Relaying Systems

분산 릴레이 시스템에서 계층적 변조를 이용한 성능 향상

  • 최두환 (인하대학교 정보통신공학부) ;
  • 강동관 (인하대학교 정보통신공학부) ;
  • 박재현 (인하대학교 정보통신공학부) ;
  • 김덕경 (인하대학교 정보통신공학부)
  • Published : 2009.01.31
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Abstract

Various relay technologies have been considered in wireless communication systems to enlarge the coverage and to enhance the system throughput. However, the coverage is limited by its modulation levels and additional time slot(s) is required for relaying. In the paper, by applying the hierarchical modulation to two-relay systems, two-hop relaying can be implemented instead of three hops, and both throughput and coverage can be enhanced. Throughout simulation analysis, the coverage extension is evaluated for different modulation levels and the total throughput is increased by up to two times.

기존의 무선 통신 시스템에서 신호의 수신 범위를 늘리고 수율을 증가시키기 위해 릴레이를 이용하는 방식이 다양하게 고려되고 있다. 하지만, 릴레이를 이용하는 방식은 변조 방식에 따라 제한된 수신 범위를 갖고 릴레이가 추가됨에 따라 추가적인 시간슬롯이 요구되는 단점이 있다. 본 논문에서는 계층적 변조방식과 두 개의 분산된 릴레이를 결합하여 2 홉 시스템을 구현하며, 수율과 최대 전송가능 영역을 모두 증대시킬 수 있는 방식을 제안한다. 제안된 방식에서는 단말의 위치에 따라 다른 레벨을 가지는 데이터의 수신이 가능함에 따라 최대수신가능 영역이 증대되고 수율이 약 2배 증가되는 이득을 얻을 수 있었다.

Keywords

References

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