10th EAI International Conference on Communications and Networking in China

Research Article

Linear Space Codes for Indoor MIMO Visible Light Communications with ML Detection

  • @INPROCEEDINGS{10.4108/eai.15-8-2015.2260672,
        author={Xiang-chuan Gao and Jian-kang Zhang Zhang and Jin Jin},
        title={Linear Space Codes for Indoor MIMO Visible Light Communications with ML Detection},
        proceedings={10th EAI International Conference on Communications and Networking in China},
        publisher={IEEE},
        proceedings_a={CHINACOM},
        year={2015},
        month={9},
        keywords={vlc-mimo ook modulation linear space code ml detection repetition code},
        doi={10.4108/eai.15-8-2015.2260672}
    }
    
  • Xiang-chuan Gao
    Jian-kang Zhang Zhang
    Jin Jin
    Year: 2015
    Linear Space Codes for Indoor MIMO Visible Light Communications with ML Detection
    CHINACOM
    IEEE
    DOI: 10.4108/eai.15-8-2015.2260672
Xiang-chuan Gao1,*, Jian-kang Zhang Zhang2, Jin Jin1
  • 1: Zhengzhou University
  • 2: McMaster University
*Contact email: iexcgao@zzu.edu.cn

Abstract

In this paper, we consider the optimal design of linear space codes for an indoor multiple input multiple output (MIMO) visible light communication (VLC) system with maximum-likelihood (ML) detection, where we assume that the full knowledge of channel state information (CSI) is available at both the transmitter and the receiver. For such a system with on-off-keying (OOK) modulation, an optimal closed-form linear space code that maximizes the minimum Euclidean distance for ML detection is attained for the scenario with two transmitters and multiple receivers. Our results reveal the fact that when the channel is good, the optimal code has either a diagonal or an anti-diagonal structure, and when the channel is bad, the optimal code is to diagonalize the channel matrix first, then, optimally distribute the total transmission power into each eigensubchannel, and then, follow a repetition coding (RC) scheme. Computer simulations verify both the accuracy and the validity of our theoretical analysis, and show that our newly proposed linear space code provides significant error performance gains over currently available space modlution (SM) and RC in literature without CSI at the transmitter.