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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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User Selection Scheme Based on the Projection Matrix

투영 행렬을 이용한 사용자 선택 기법

  • Kim, Gibum (School of Electrical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jinwoo (School of Electrical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Hyuncheol (School of Electrical Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2015.03.31
  • Accepted : 2015.06.19
  • Published : 2015.07.31
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Abstract

In this paper, we describe a greedy user selection scheme for multiuser multiple-input multiple-output (MIMO) systems. We propose a new metric which has significantly improved performance compared to the Frobenius norm metric. The approximation of projection matrix is applied to increase the accuracy of Frobenius norm of effective channel matrix. We analyze the computational complexity of two metrics by using flop counts, and also verify the achievable sum rate through numerical simulation. Our simulation result shows that the proposed metric can achieve the improved sum rate as the number of user antenna increases.

본 논문은 투영 행렬을 이용한 높은 채널 용량을 획득할 수 있는 사용자 선택 기법을 제안한다. 기존의 Frobenius norm기반의 사용자 선택 기법이 다수의 사용자를 선택할수록 정확도가 감소하는 점을 투영 행렬의 근사화 형태를 이용하여 개선하였다. Flop count를 이용한 제안 기준의 계산복잡도를 분석하였고, 모의 실험을 통하여 안테나 구성에 따른 획득 가능한 채널 용량에 대해서 비교하였다. 모의 실험 결과를 통해 제안한 사용자 선택 기법이 더 높은 채널 용량을 획득하는 것을 확인하였다.

Keywords

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