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Channel capacity bounds are derived for a point-to-point indoor visible lightcommunications (VLC) system with signal-dependent Gaussian noise. Consideringboth illumination and communication, the non-negative input of VLC isconstrained by peak and average optical intensity constraints. Two scenariosare taken into account: one scenario has both average and peak opticalintensity constraints, and the other scenario has only average opticalintensity constraint. For both two scenarios, we derive closed-from expressionsof capacity lower and upper bounds. Specifically, the capacity lower bound isderived by using the variational method and the property that the outputentropy is invariably larger than the input entropy. The capacity upper boundis obtained by utilizing the dual expression of capacity and the principle of"capacity-achieving source distributions that escape to infinity". Moreover,the asymptotic analysis shows that the asymptotic performance gap between thecapacity lower and upper bounds approaches zero. Finally, all derived capacitybounds are confirmed using numerical results.

Tight Capacity Bounds for Indoor Visible Light Communications With Signal-Dependent Noise