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

  • 제33권9C호
  • /
  • Pages.734-742
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  • 2008
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  • 1226-4717(pISSN)
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  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

공간다중화 MIMO 시스템을 위한 Soft Output 성능향상 기법

A Soft Output Enhancement Technique for Spatially Multiplexed MIMO Systems

  • 김진민 (중앙대학교 전자전기공학부 디지털통신연구실) ;
  • 임태호 (중앙대학교 전자전기공학부 디지털통신연구실) ;
  • 김재권 (연세대학교 원주캠퍼스 컴퓨터정보통신공학부) ;
  • 이주현 (삼성전자 정보통신연구소) ;
  • 조용수 (중앙대학교 전자전기공학부 디지털통신연구실)
  • 발행 : 2008.09.30
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⟨ 이전 논문 다음 논문 ⟩

초록

무선통신 채널에서 높은 전송 속도를 가능하게 하는 공간다중화 MIMO 시스템에서 다중화된 신호를 검출하는 것은 어려운 작업이며, 최근 다양한 신호검출 기법들이 개발되었다. 다양한 신호검출기법 중 maximum likelihood detection with QR decomposition and M-algorithm (QRM-MLD), sphere decoding (SD), QOC, MOC와 같은 기법들은 maximum liklihood (ha)기법과 유사한 경판정 달성한다. 그러나 일반적으로 이러한 기법들은 soft output의 신뢰도가 저하되는 문제점을 가진다. 본 논문에서는 기존 신호검출기법들의 soft output 신뢰도를 향상시키는 기법을 제안한다. 모의실험을 통하여 기존의 기법들과 결합시 제안된 방법에 의해 개선된 성능을 얻을 수 있음을 보인다.

In spatially multiplexed MIMO systems that enable high data rate transmission over wireless communication channels, the spatial demultiplexing at the receiver is a challenging task and various demultiplexing methods have been developed. Among the previous methods, maximum likelihood detection with QR decomposition and M-algorithm (QRM-MLD), sphere decoding (SD), QOC, and MOC schemes have been reported to achieve a (near) maximum likelihood (ML) hard decision performance. In general, however, the reliability of soft output of these schemes is not satisfactory. In this paper, we propose a method which enhances the reliability of soft output. By computer simulations, we demonstrate the improved performance by the proposed method.

키워드

참고문헌

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