Capacity and Optimum Signal Constellations for VLC Systems

被引:16
作者
Jia, Linqiong [1 ,2 ]
Shu, Feng [1 ]
Huang, Nuo [3 ]
Chen, Ming [2 ]
Wang, Jiangzhou [4 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Peoples R China
[2] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Peoples R China
[3] Univ Sci & Technol China, Chinese Acad Sci, Sch Informat Sci & Technol, Key Lab Wireless Opt Commun, Hefei 230027, Peoples R China
[4] Univ Kent, Sch Engn & Digital Arts, Canterbury CT2 7NT, Kent, England
基金
中国国家自然科学基金;
关键词
Visible light communication; capacity-achieving PDF; constellation optimization; amplitude constraint; average intensity constraint; OPTICAL-INTENSITY CHANNELS; DESIGN; COMMUNICATION; INFORMATION; AMPLITUDE; BOUNDS;
D O I
10.1109/JLT.2020.2971273
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this article, the capacity of the point-to-point VLC system is investigated by means of a functional analysis subjected to amplitude constraint and average intensity constraint. It is proved that the capacity can be achieved by a unique probability density function (PDF). The necessary and sufficient condition for the capacity-achieving PDF is derived by the functional optimization theorem. Moreover, the capacity-achieving PDF is proved to be discrete and finite. Based on these properties, the capacity-achieving constellation optimization problems under amplitude constraint and average intensity constraint is formulated and an algorithm is proposed to solve the corresponding problem. To apply simple adaptive modulation in practical VLC systems, constellation optimization problem subject to an additional equal probability constraint is formulated and solved by maximizing the mutual information as well.
引用
收藏
页码:2180 / 2189
页数:10
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