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This paper provides new inner and outer bounds on the capacity region ofoptical intensity multiple access channel (OIMAC) with per-user average or peakpower constraint. For the average power constrained OIMAC, our bounds at highpower are asymptotically tight, thereby characterizing the asymptotic capacityregion. The bounds are extended to K-user OIMAC with average power constraintwithout loss of asymptotic optimality. For the peak power constrained OIMAC, athigh power, we bound the asymptotic capacity region to within 0.09 bits, anddetermine the asymptotic capacity region in the symmetric case. At moderatepower, for both types of constraints, the capacity regions are bounded towithin fairly small gaps.

Bounds on the Capacity Region of the Optical Intensity Multiple Access Channel