Abstract

This paper studies 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. Closed-form expressions for the
asymptotic high-signal-to-noise-ratio (high-SNR) capacity and for
the corresponding capacity-achieving input distribution are
presented. Moreover, several practical modulation schemes are
proposed 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: Wed Jan 22 14:48:50 UTC 2025