A Novel Probabilistic Shaping Based Chaotic Encryption for VLC Systems

Visible light communication (VLC) suffers from eavesdropping due to its broadcast nature and channel openness in public areas. In this paper, we propose a low-rate loss distribution matching to generate shaped symbols, further employing chaotic sequences to encrypt symbols. Numerical results show that the proposed scheme outperforms constant component distribution matching (CCDM)-based probabilistic shaping and conventional direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) scheme in terms of both bit error rate (BER) and general mutual information (GMI). The proposed scheme enjoys the benefit of the large key space of 10 ⁶⁵ , which can prevent almost any violent attacks.