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<p>In the context of 6&#xa0;G, visible-light communications (VLC) has emerged as a green supplement to existing radio-frequency backbones. However, VLC is known for its dependence on line-of-sight (LoS) and inter-symbol interference (ISI) at high data-rates. To achieve competitive data-rates in the absence of LoS, the technology of Reconfigurable Intelligent Surface (RIS) has emerged for VLC. In conjunction with RIS, robust post-distorters are also required for equalizing non-Gaussian VLC links impaired by NLoS and residual ISI. This paper presents a performance evaluation of Logarithmic Hyperbolic Cosine Adaptive Filter (LHCAF)-based post-distortion, which is found to enhance such non-Gaussian VLC links caused by NLoS and residual ISI. As a breakthrough, we find that in the absence of LoS, an LHCAF post-distorter is found to deliver equivalent performance as compared to RIS aided VLC system with LoS. This finding alleviates the dependence on LoS path for achieving the intended cutting-edge data rates from VLC systems.</p>

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LHCAF based post distortion for RIS enabled visible light communication

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Krishna Teja Yadav CH T,
  • Venkateswaran K

摘要

In the context of 6 G, visible-light communications (VLC) has emerged as a green supplement to existing radio-frequency backbones. However, VLC is known for its dependence on line-of-sight (LoS) and inter-symbol interference (ISI) at high data-rates. To achieve competitive data-rates in the absence of LoS, the technology of Reconfigurable Intelligent Surface (RIS) has emerged for VLC. In conjunction with RIS, robust post-distorters are also required for equalizing non-Gaussian VLC links impaired by NLoS and residual ISI. This paper presents a performance evaluation of Logarithmic Hyperbolic Cosine Adaptive Filter (LHCAF)-based post-distortion, which is found to enhance such non-Gaussian VLC links caused by NLoS and residual ISI. As a breakthrough, we find that in the absence of LoS, an LHCAF post-distorter is found to deliver equivalent performance as compared to RIS aided VLC system with LoS. This finding alleviates the dependence on LoS path for achieving the intended cutting-edge data rates from VLC systems.