On the Sum-Capacity of Two-User Optical Intensity Multiple Access Channels
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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 on decompositions of several continuous and discrete random variables, we derive several bounds on the sum-capacity. In the high signal-to-noise ratio (SNR) regime, some bounds asymptotically match or approach the sum-capacity, thus complementing or reducing the existing gaps on high-SNR asymptotic sum-capacity. At moderate SNR, some bounds are also fairly close to the sum-capacity.
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