Open AccessConstellation optimization under the ergodic VLC channel based on generalized spatial modulation
Author(s) -
Fubin Wang,
Fang Yang,
Jian Song
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.397831
Subject(s) - visible light communication , modulation (music) , ergodic theory , constellation , computer science , channel (broadcasting) , optics , telecommunications , phase modulation , optical wireless , mathematics , physics , topology (electrical circuits) , wireless , acoustics , phase noise , light emitting diode , mathematical analysis , astronomy , combinatorics
When the generalized spatial modulation (GSM) is applied to visible light communication (VLC), radio frequency (RF) technologies, such as constellation designs, should be modified for the ergodic VLC channel, which is different from that in typical RF environments. In this paper, constellations of amplitude-phase modulation (APM) symbols are optimized for GSM-based VLC systems in which optical signals must be real-valued and non-negative, while the ergodic VLC channel and the random characteristic of receiver locations are also considered. The algorithm of statistically convergent gradient descent (SCGD) is adopted for the maximization of coded modulation average mutual information (CM-AMI), and superior performances of optimal constellations are verified by numerical simulations.