Abstract

We study the multiple-input single-output free-space optical
intensity channel with signal-independent additive Gaussian noise
and subject to both an average- and a peak-intensity
constraint. We present closed-form expressions for the asymptotic
high-signal-to-noise-ratio (high-SNR) capacity and for the
corresponding capacity-achieving input distribution. Moreover, we
propose several practical modulation schemes that approach the
capacity over a wide range of practical SNR values.

-||-   _|_ _|_     /    __|__   Stefan M. Moser
[-]     --__|__   /__\    /__   Senior Scientist, ETH Zurich, Switzerland
_|_     -- --|-    _     /  /   Adjunct Professor, National Yang Ming Chiao Tung University, Taiwan
/ \     []  \|    |_|   / \/    Web: https://moser-isi.ethz.ch/

Last modified: Mon Apr 7 07:58:55 UTC 2025