Preceding Scheme for Dual Spatial Multiplexing Systems with Limited Feedback

제한된 피드백 정보를 이용하는 이중 공간 다중화 시스템의 Preceding 기법

  • Lee, Myoung-Won (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Mun, Cheol (Department of Electronic Communication Engineering, ChungJu National University) ;
  • Yook, Jong-Gwan (Department of Electrical and Electronic Engineering, Yonsei University)
  • 이명원 (연세대학교 전기전자공학과) ;
  • 문철 (충주대학교 전자통신공학과) ;
  • 육종관 (연세대학교 전기전자공학과)
  • Published : 2006.12.31

Abstract

In this paper, for spatial multiplexing with limited feedback, a precoding scheme is proposed based on the joint use of minimal instantaneous feedback and long-term feedback of a small number of bits, wherein the long-term feedback is used to convey a selected preceding matrix within a precodercodebook consisting of a number of unitary matrices, and the active column vectors of the selected unitary matrix are conveyed to the transmitter using instantaneous feedback. Focusing on the case of dual multi-input multi-output(MIMO) systems, precoder codebook design for maximizing the average throughput of a spatial multiplexing system with a zero-forcing(ZF) receiver is proposed. It is shown that the proposed scheme provides a considerable throughput enhancement over multi-mode antenna selection and multi-mode basis selection only with the additional long-yterm feedback of a small number of bits. For example, the throughput increases by 11.5 % than antenna selection and 5.1% than basis selection, respectively, when SNR=20 dB.

본 논문에서는 제한된 피드백 정보를 사용하는 공간 다중화 시스템을 위한 preceding 기법을 제안하였다. 제안하는 precoding 기법은 unitary 행렬로 구성된 precoder 코드북내에서 preceding 행렬의 선택 정보를 송신단에 전달하는 장구간 피드백과 선택된 unitary 행렬의 열 벡터 중 전송체 사용될 열 벡터 정보를 송신단에 전달하는 단구간 피드백을 이용한다. 또한, zero-forcing 수신기를 사용하는 $2{\times}2$ MIMO 시스템에 대해 평균 throughput을 최대화하는 precoder 코드북을 디자인하였다. 모의 실험 결과에 따르면 제안된 기법은 몇 비트의 장구간 피드백 정보를 추가함으로써 평균 SNR이 20 dB인 환경에서 멀티모드 안테나 선택 기술이나 멀티모드 기저 선택 기술에 비해 throughput 성능이 각각 11.2 %, 5.1 % 증가한다.

Keywords

References

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