Abstract
In this article, we analyze the performance of probabilistic shaping (PS) color shift keying (CSK) modulated visible light communication (VLC) systems. Specifically, we have considered three variants of CSK with respect to receiver structure, namely CSK with one photodetector (PD), CSK with three PDs, and CSK with one avalanche PD. For shaping the CSK input symbols, four different source distributions are considered viz., uniform, exponential, Maxwell–Boltzmann, and Pareto. The article comprises of developing algorithms to obtain the optimum probability order for maximizing the received signal-to-noise ratio (SNR) gain. The proposed systems have been analyzed for computational complexity. Furthermore, the closed-form expressions for symbol error rate (SER) have been derived for the proposed PS-CSK schemes. It has been observed that proposed PS-CSK schemes provide different SNR gain for different source distributions at a given SER. The results show that PS based on Pareto distribution gives the best performance gain at unity achievable information rate among all considered source distributions.
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