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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Power Allocation Algorithms for ZF-THP Sum Rate Optimization in Multi-user Multi-antenna Systems

ZF-THP를 이용한 다중 안테나 다중 사용자 시스템에서 전송률 합 최적화를 위한 전력 할당 알고리즘

  • 이욱봉 (고려대학교 전기전자전파공학과) ;
  • 송창익 (고려대학교 전기전자전파공학과) ;
  • 이상림 (고려대학교 전기전자전파공학과) ;
  • 이길봄 (고려대학교 전기전자전파공학과) ;
  • 곽진삼 (LG 전자 차세대통신연구소) ;
  • 이인규 (고려대학교 전기전자전파공학과)
  • Received : 2012.01.31
  • Accepted : 2012.08.08
  • Published : 2012.09.30
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Abstract

In this paper, we study a power allocation technique for Tomlinson-Harashima precoding (THP) in multi-user multiple input single output (MISO) downlink systems. In contrast to previous approaches, a mutual information based method is exploited for maximizing the sum rate of zero-forcing THP systems. Then, we propose a simple power allocation algorithm which assigns proper power level for modulo operated users. Simulation results show that the proposed scheme outperforms a conventional water-filling method, and it provides similar performance with near optimal method with much reduced complexity.

이 논문에서 우리는 Tomlinson-Harashima precoding (THP)를 이용한 다중 입력 단일 출력 다중 사용자 하향링크 시스템을 위한 전력할당 기법에 대해 알아본다. Zero-forcing THP 시스템의 sum rate를 최대화하기 위해 우리는 이전 방법과는 달리 mutual information 방법을 적용하였다. 나아가서, 모듈로 오퍼레이션을 사용하는 유저에 적절한 전력 레벨을 할당하기 위해 간단한 전력 할당 알고리즘을 제안한다. 실험 결과는 제안된 기법이 기존의 water-filling 기법보다 성능이 우수하고, 시스템의 최적의 성능을 내는 기법과 성능은 유사하면서 보다 작은 복잡도로 이루는 것을 보여준다.

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