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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Design on the Interference Alignment Transceiver for Multi-Cell MIMO Downlink Channels

다중 셀 다중 안테나 하향링크 채널에서의 간섭 정렬 송수신기 설계

  • 이현호 (고려대학교 전자전기공학과 통신시스템 연구실) ;
  • 고영채 (고려대학교 전자전기공학과 통신시스템 연구실)
  • Received : 2012.08.03
  • Accepted : 2012.10.08
  • Published : 2012.10.30
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Abstract

In this paper, we propose a novel interference alignment transceiver for multi-cell MIMO downlink channels with arbitrary number of cells and users per cell. We design the receive beamformer to align the interference from undesired base stations to the effective inter-cell interference (ICI) channels. Subsequently, we design the transmit precoder which can nulllify the interference from the corresponding base station. The proposed transceiver design can attain the degrees of freedom (DOF) equal to the number of streams per user. Accordingly, we investigate conditions for the antenna configuration. From numerical results, we confirm that the proposed transceiver design can achieve higher DOF than the conventional scheme under equal antenna configuration.

본 논문에서는 임의의 셀 수 혹은 셀 당 임의의 사용자 수를 가지는 다중 셀 다중 안테나 하향링크 채널에 적용 가능한 간섭 정렬 기반 송수신기 설계를 제안한다. 타 셀로부터 오는 간섭 신호를 유효 타 셀 간섭 채널로 정렬시키는 수신 빔포머를 설계한 후, 해당 기지국으로부터 야기되는 모든 간섭 신호를 제거할 수 있는 송신 프리코더를 설계한다. 제안된 송수신기 설계는 사용자 당 전송하는 데이터 스트림 수 만큼의 자유도를 획득할 수 있고 이를 위한 안테나 조건을 구한다. 모의 실험 결과를 통하여 기지국과 사용자의 안테나 수가 동일한 조건 하에서 제안된 송수신기 설계가 기존의 기법보다 높은 자유도를 얻음을 확인한다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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