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

作　　者：Xinyue Guo Meixia Lu Qibin Zheng 郭心悦;卢美霞;郑其斌(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)

机构地区：[1]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 [2]Laboratory of Radiation Detection and Medical Imaging,School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Chinese Optics Letters》2024年第6期109-115,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.12105177);the National Key ResearchandDevelopmentProgramofChina (No.2023YFF0719202)。

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 nonlinear 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.

关 键 词：visible light communication superposed constellation nonlinear coding 

分 类 号：TN929.1[电子电信—通信与信息系统]