Superposed probabilistically shaped QAM constellation design based on nonlinear coding for MIMO visible light communication systems

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外文摘要：In this study,we propose a superposed probabilistically shaped[PS]quadrature amplitude modulation[QAM]constellation scheme for multiple-input multiple-output visible light communication systems.PS QAM signals are generated from a non-linear coding equation that converts uniformly distributed 8-level signals into PS 9-or 10-level signals,which are then mapped into PS 9QAM or 10QAM signals.Square-shaped 9QAM and trapezoid-shaped 10QAM constellations are introduced to maximize the minimum Euclidean distance[MED]of the superposed constellation.Finally,the PS 9QAM and 10QAM signals are superposed with the 4QAM signals in a flipped manner to obtain PS 36QAM or 40QAM signals at the receiver,respectively.To exploit the temporal correlation of the resulting signal from nonlinear coding,we developed a detection algorithm based on Viterbi decoding.Experimental results confirmed the superiority of the proposed schemes by achieving a higher MED and stronger ability to resist nonlinearity.Compared with the traditional scheme,the peak-to-peak voltage dynamic ranges of the superposed 36QAM and 40QAM constellation schemes were improved by 52％and 48％,respectively.

外文关键词：

visible light communicationsuperposed constellationnonlinear coding

作者：

郭心悦、卢美霞、郑其斌

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作者单位：

Key Laboratory of Optical Technology and Instrument for Medicine,Ministry of Education,School of Optical-Electrical and Computing Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

Laboratory of Radiation Detection and Medical Imaging,School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出版年：

2024

DOI：

10.3788/COL202422.060601

中国光学快报(英文版)

中国光学学会中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD

影响因子：1.305

ISSN：1671-7694

年,卷(期)：2024.22(6)