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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Extendable Fixed-Complexity Sphere Decoder for Downlink Multi-User MIMO Communication System

하향링크 다중 사용자 MIMO 통신 시스템을 위한 확장형 고정복잡도 스피어 복호기

  • Received : 2013.12.19
  • Accepted : 2014.04.11
  • Published : 2014.04.30
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Abstract

In this paper, a extension of a fixed-complexity sphere decoder (FSD) to perform interference signal detection and cancelling is proposed for downlink multiuser multiple input-multiple output (MIMO) communication system. It is based on the application of channel matrix expansion on generalized sphere decoder (GSD), and modification of the channel matrix ordering scheme to a FSD algorithm for interference detection. A Monte Carlo simulation shows that the proposed algorithm improves the receiver performance by 3 dB as compared to maximum likelihood detection without interference cancelling at 10% packet error rate in configuration of 702 Mbit/s datarate for four users respectively on IEEE802.11ac.

본 논문에서는, 하향 다중 사용자 MIMO 환경에서 간섭 검출 및 제거를 하기위해 확장된 fixed-complexity sphere decoder (FSD) 알고리즘이 제안되었다. 제안된 알고리즘은, generalized sphere decoder (GSD) 알고리즘을 이용한 채널행렬 확장과 간섭신호와 요구신호를 고려한 채널행렬 순서화를 통해 FSD 알고리즘을 간섭신호 검출에 활용 가능하도록 확장 하였다. IEEE802.11ac의 통신모드 중 네 명의 다중 사용자에게 각각 702 Mbit/s 전송이 가능한 환경의 몬테카를로실험을 통해서, 제안된 알고리즘이 10% packet error rate기준으로 간섭제거 기능이 없는 maximum-likelihood 검출성능 대비 $E_b/N_0$가 약 3 dB 향상됨을 보여주었다.

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References

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