Open AccessUnderwater visible light communication at 3.24 Gb/s using novel two-dimensional bit allocation
Author(s) -
Peng Zou,
Yiheng Zhao,
Fangchen Hu
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.390718
Subject(s) - quadrature amplitude modulation , bit error rate , computer science , visible light communication , modulation (music) , qam , optics , nonlinear system , interference (communication) , underwater , transmission (telecommunications) , forward error correction , electronic engineering , algorithm , telecommunications , physics , decoding methods , channel (broadcasting) , oceanography , light emitting diode , engineering , quantum mechanics , acoustics , geology
Underwater visible light communication (UVLC) systems suffer from a strong nonlinear effect and high inter-symbol interference (ISI). In this study, to improve the performance of a UVLC system under such conditions, we propose a novel nonlinear hybrid modulation scheme named two-dimensional bit allocation (2DBA). By comparing the performance of 2DBA with the famous Levin-Campello (LC) algorithm and the quadrature amplitude modulation (QAM)-based time-domain hybrid modulation (TDHQ) algorithm, we have proved by analysis and experiment that 2DBA can outperform the power allocation-based LC algorithm and the TDHQ algorithm below the 3.8×10 -3 hard decision forward error correction threshold (HD-FEC) when the system has a severe nonlinear effect and ISI. The data rate 3.24 Gb/s of 2DBA is measured after 1.2 m underwater transmission; as far as we know, this is the highest data rate reported in a blue LED chip based UVLC system.