This paper investigates the sum-capacity of two-user optical intensity multiple access channels with per-user peak- or/and average-intensity constraints. By leveraging tools from the decomposition of certain maxentropic distributions, we derive several lower bounds on the sum-capacity. In the high signal-to-noise ratio (SNR) regime, some bounds asymptotically match or approach the sum-capacity, thus closing or reducing the existing gaps to the high-SNR asymptotic sum-capacity. At moderate SNR, some bounds are also fairly close to the sum-capacity.

翻译：本文研究了在每用户峰值和/或平均强度约束下，双用户光强度多址接入信道的和容量。通过利用某些最大熵分布分解的工具，我们推导了和容量的几个下界。在高信噪比（SNR）区域，某些界渐近匹配或接近和容量，从而缩小或消除了与高信噪比渐近和容量之间的现有差距。在中等信噪比下，某些界也相当接近和容量。