On the Capacity of Free-Space Optical Intensity Channels

Details On the Capacity of Free-Space Optical Intensity Channels On the Capacity of Free-Space Optical Intensity Channels

2008-05-05

arxiv.org/abs/0805.0521v1

Computer Science

Information Theory

To be presented at ISIT 2008 in Toronto

Scientific paper

New upper and lower bounds are presented on the capacity of the free-space optical intensity channel. This channel is characterized by inputs that are nonnegative (representing the transmitted optical intensity) and by outputs that are corrupted by additive white Gaussian noise (because in free space the disturbances arise from many independent sources). Due to battery and safety reasons the inputs are simultaneously constrained in both their average and peak power. For a fixed ratio of the average power to the peak power the difference between the upper and the lower bounds tends to zero as the average power tends to infinity, and the ratio of the upper and lower bounds tends to one as the average power tends to zero. The case where only an average-power constraint is imposed on the input is treated separately. In this case, the difference of the upper and lower bound tends to 0 as the average power tends to infinity, and their ratio tends to a constant as the power tends to zero.

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