전자공학회논문지 (Journal of the Institute of Electronics and Information Engineers)

  • 제52권3호
  • /
  • Pages.19-24
  • /
  • 2015
  • /
  • 2287-5026(pISSN)
  • /
  • 2288-159X(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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Massive MIMO WPCN에서 에너지 효율 향상을 위한 안테나 수 최적화 기법

Optimization of the Number of Antennas for Energy Efficiency in Massive MIMO WPCN

  • 한용규 (연세대학교 전기전자공학과) ;
  • 심동규 (연세대학교 전기전자공학과) ;
  • 이충용 (연세대학교 전기전자공학과)
  • Han, Yonggue (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Sim, Dongkyu (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Lee, Chungyong (Department of Electrical and Electronic Engineering, Yonsei University)
  • 투고 : 2014.11.24
  • 심사 : 2015.02.26
  • 발행 : 2015.03.25
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초록

본 논문에서는 massive multiple-input multiple-output (MIMO) 기반의 wireless powered communication network (WPCN)에서 에너지 효율을 향상시키기 위한 기지국 안테나 수 최적화 기법을 제안한다. 제안하는 기법은 massive MIMO 시스템의 채널 hardening 특성을 이용하여 채널 이득을 안테나 수에 대한 식으로 근사한다. 그리고 근사화 된 최적화 문제에 편미분을 적용한 후 Lambert-W 함수를 이용하여 최적해를 closed form으로 찾는다. 모의실험을 통해 제안하는 기법의 근사 과정과 최적화 문제를 해결하는 방법이 적절함을 보이고, closed form 해가 exhaustive search 방법으로 찾은 해와 오차가 크지 않음을 확인한다.

We introduce an optimization of the number of base station antennas in massive multiple-input multiple-output (MIMO) wireless powered communication network (WPCN). We use channel hardening property of massive MIMO system to approximate channel gain in terms of the number of base station antennas. Then, we find an optimal solution by partial differential and obtain a closed form solution by using Lambert-W function. The simulation results show that the approximation and the method of solving the optimization problem are reasonable, and the optimal solution of proposed scheme is almost identical to the optimal number of base station antennas by the exhaustive search method.

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참고문헌

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