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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Feasibility of Interference Alignment for Reverse Duplex in MIMO Cellular Networks with One-side Base Cooperation

다중 안테나를 사용하는 단방향 기지국 협력 역 듀플렉스 셀룰러 네트워크의 간섭 정렬 타당성

  • Kim, Kiyeon (School of Electrical and Electronic Engineering, Yonsei Univ.) ;
  • Jeon, Sang-Woon (Department of Information and Communication Engineering, Andong National Univ.) ;
  • Yang, Janghoon (Department of Newmedia, Korean German Institute of Technology) ;
  • Kim, Dong Ku (School of Electrical and Electronic Engineering, Yonsei Univ.)
  • Received : 2014.11.04
  • Accepted : 2015.02.10
  • Published : 2015.02.28
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Abstract

The feasibility conditions of interference alignment (IA) are analyzed for reverse duplex systems, in which one cell operates as downlink (DL) while the other cell operates as uplink (UL) assuming one-sid base station (BS) cooperation. Under general multiple-input and multiple-output (MIMO) antenna configurations, a necessary condition and a sufficient condition for one-shot linear IA are established, i.e., linear IA without symbol or time extension. In several example networks, optimal sum degrees of freedom (DoF) is characterized by the derived necessary condition and sufficient condition. For some special class of networks, a sufficient condition is established in a more compact expression, which also yields the necessary and sufficient condition. Simulation results demonstrate that the proposed IA does not only achieve larger DoF but also significantly improves the sum rate in the practical signal-to-noise ratio (SNR) regime.

본 논문에서는 상향링크와 하향링크가 공존하는 역 듀플렉스 셀룰러 네트워크 상황에서 단방향 기지국 협력을 통한 단사 간섭 정렬 타당성에 대한 연구를 하였다. 일반적인 안테나 개수와 사용자수에 따른 단사 간섭 정렬의 필요조건과 충분조건을 제시하였고, 이어서 특정 조건을 만족하는 네트워크에서 간략화 된 충분조건을 제시하였다. 특히 대칭 네트워크 상황에서는 단사 간섭 정렬의 필요충분조건을 제시하였고, 각 셀 당 두 명의 사용자가 존재하는 대칭 네트워크 상황에서는 닫힌 형태의 필요충분조건을 규명하였다. 제안한 단방향 기지국협력을 통해 합 자유도를 크게 증가시킬 수 있으며, 모의실험을 통해 상용 신호 대 잡음비 영역에서 합 전송률을 획기적으로 개선 할 수 있음을 확인 하였다.

Keywords

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