光通信技术2024，Vol.48Issue(2)：56-61,6.DOI:10.13921/j.cnki.issn1002-5561.2024.02.010
基于非线性编码的叠加概率整形20QAM星座方案
Superposed probabilistic shaping 20QAM constellation scheme based on nonlinear coding
卢美霞 1郭心悦1
作者信息
- 1. 上海理工大学 光电信息与计算机工程学院,上海 200093
- 折叠
摘要
Abstract
Aiming at the problems of high computational complexity and easy overlap of adjacent constellation points in multi-in-put multi-output visible light communication systems,a superposed probabilistically shaped(PS)20-level quadrature amplitude modulation(20QAM)constellation scheme based on nonlinear coding is proposed.Firstly,based on the proposed nonlinear cod-ing equation,a 4-level signal with equal probability is encoded into a PS 5-level signal.Then,the PS 5-level signal is mapped into a trapezoid-shaped PS 5QAM signal to maximize the Euclidean distance of the superposed constellation.Finally,the PS 5QAM signal is superposed with an equal-probability 4QAM signal to obtain a PS 20QAM signal.The experimental results prove that the proposed superposed 20QAM constellation scheme has strong robustness to nonlinear distortion of the system and better bit error rate performance than superposed 16QAM and superposed 24QAM constellation schemes.关键词
可见光通信/非线性编码/多输入多输出/概率整形/叠加星座Key words
visible light communication/nonlinear coding/multiple-input multiple-output/probabilistic shaping/superposed constellation分类
信息技术与安全科学引用本文复制引用
卢美霞,郭心悦..基于非线性编码的叠加概率整形20QAM星座方案[J].光通信技术,2024,48(2):56-61,6.
