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 $\mathcal{E}$, the capacity scales as $\mathcal{E}\sqrt{ \frac{\log \frac{1}{\mathcal{E}}}{2} }$.

翻译：本文研究了低信噪比（SNR）条件下具有平均强度约束的光无线信道的容量。当输入的平均强度不超过一个较小的$\mathcal{E}$时，容量渐近行为为$\mathcal{E}\sqrt{ \frac{\log \frac{1}{\mathcal{E}}}{2} }$。