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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Feedback Reduction Scheme of SDMA with Quantized CSI using User Restriction

사용자 제한을 이용한 양자화된 채널 상태 정보를 갖는 공간 분할 다중 접속 방식의 되먹임 감소 기법

  • Seo, Woo-Hyun (Dept. of Electrical and Electronic Engin., Yonsei University) ;
  • Park, Sung-Soo (Dept. of Electrical and Electronic Engin., Yonsei University) ;
  • Min, Hyun-Kee (Dept. of Electrical and Electronic Engin., Yonsei University) ;
  • Hong, Dea-Sik (Dept. of Electrical and Electronic Engin., Yonsei University)
  • 서우현 (연세대학교 전기전자공학부) ;
  • 박성수 (연세대학교 전기전자공학부) ;
  • 민현기 (연세대학교 전기전자공학부) ;
  • 홍대식 (연세대학교 전기전자공학부)
  • Published : 2010.02.25
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Abstract

Introducing the quantized channel state information (CSI), space division multiple access (SDMA) can extract the multiplexing gain with the limited feedback burden. However, huge signaling burden of feedback can still suffer SDMA system because the total feedback data of SDMA is linearly dependent on the number of users. Hence, we propose a new feedback scheme to control the feedback load decided by the number of users. In this scheme, the cut-off level, which restricts the feedbacks of poor conditioned users, is suggested for the reduction of the feedback burden without the performance loss. From simulation results, then, we show that the proposed feedback scheme can achieve not only the sum-rate gain but also the reasonable feedback reduction.

양자화된 채널 상태 정보를 이용하는 공간 분할 다중 접속 방식은 제한된 되먹임 정보로도 다중 송신의 이득을 가질 수 있다. 그러나 되먹임 정보의 양은 사용자에 따라 선형적으로 증가하기 때문에, 공간 분할 다중 접속 방식은 제한된 되먹임 방식을 사용하더라도 여전히 높은 신호처리 부담을 갖게 된다. 그러므로 본 논문에서는 대상이 되는 사용자 수를 효과적으로 제어할 수 있는 새로운 되먹임 방식을 제안한다. 제안하는 방식에서는 성능 열화 없이 되먹임 정보량을 줄이기 위해 되먹임 요청 기준 조건을 제시하고 이에 미치지 못하는 열악한 통신 환경의 사용자들을 제한한다. 본 논문의 모의 실험에서는 제안하는 방식이 전송 효율 이득을 높일 뿐만 아니라 되먹임 정보를 합리적으로 감소시킬 수 있음을 보여준다.

Keywords

References

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