On the Low-SNR Asymptotic Capacity of Optical Wireless Channels with Average-Intensity Constraints

This paper investigates the capacity of an optical wireless channel with an average-intensity constraint in the low signal-to-noise ratio (SNR) regime. When the average intensity of the input is no larger than a small E, the capacity scales as
$\mathcal{E} \sqrt{\frac{\log \frac{1}{\varepsilon}}{2}}$