Communications and Networking. 11th EAI International Conference, ChinaCom 2016, Chongqing, China, September 24-26, 2016, Proceedings, Part I

Research Article

A Novel OFDM Scheme for VLC Systems Under LED Nonlinear Constraints

  • @INPROCEEDINGS{10.1007/978-3-319-66625-9_38,
        author={Lingkai Kong and Congcong Cao and Siyuan Zhang and Mengchao Li and Liang Wu and Zaichen Zhang and Jian Dang},
        title={A Novel OFDM Scheme for VLC Systems Under LED Nonlinear Constraints},
        proceedings={Communications and Networking. 11th EAI International Conference, ChinaCom 2016, Chongqing, China, September 24-26, 2016, Proceedings, Part I},
        proceedings_a={CHINACOM},
        year={2017},
        month={10},
        keywords={Optical orthogonal frequency division multiplexing (O-OFDM) Clipped infomation Coefficients separation Nonlinear distortion Light-emitting diodes (LEDs)},
        doi={10.1007/978-3-319-66625-9_38}
    }
    
  • Lingkai Kong
    Congcong Cao
    Siyuan Zhang
    Mengchao Li
    Liang Wu
    Zaichen Zhang
    Jian Dang
    Year: 2017
    A Novel OFDM Scheme for VLC Systems Under LED Nonlinear Constraints
    CHINACOM
    Springer
    DOI: 10.1007/978-3-319-66625-9_38
Lingkai Kong1,*, Congcong Cao1,*, Siyuan Zhang1,*, Mengchao Li1,*, Liang Wu1,*, Zaichen Zhang1,*, Jian Dang1,*
  • 1: Southeast University
*Contact email: konglingkai@seu.edu.cn, caocongcong@seu.edu.cn, zhangsiyuan@seu.edu.cn, limengchao@seu.edu.cn, wuliang@seu.edu.cn, zczhang@seu.edu.cn, newwanda@seu.edu.cn

Abstract

In this paper, a novel optical orthogonal frequency division multiplexing (O-OFDM) scheme based on real-imaginary coefficients separation is proposed for visible light communications (VLCs) to mitigate nonlinear distortion of light-emitting diodes (LEDs). In the proposed scheme, the transmitted signal in the frequency domain does not need to be Hermitian symmetric, and real and imaginary parts are separated. Signals are introduced to keep the clipped information due to the high peak to average power ratio of OFDM, and a procedure to recover the clipped information is proposed. The transmit strategy and receive algorithm of the proposed scheme are presented in detail. Simulation results show that compared with traditional O-OFDM schemes, the proposed scheme can achieve better bit error rate performance under LED nonlinear constraints and reduce the requirement for the linear dynamic range of LEDs.