Physical-Layer Network Coding Enhanced Visible Light Communications Using RGB LEDs

被引:8
|
作者
Xiong, Jian [1 ]
Zhang, Runxin [2 ,3 ]
Lu, Lu [2 ,3 ]
Sun, Qifu Tyler [1 ]
Long, Keping [1 ]
机构
[1] Univ Sci & Technol Beijing, Sch Comp & Commun Engn, Beijing, Peoples R China
[2] Chinese Acad Sci, Technol & Engn Ctr Space Utilizat, Key Lab Space Utilizat, Beijing, Peoples R China
[3] Univ Chinese Acad Sci, China Emai, Beijing 100049, Peoples R China
来源
IEEE PHOTONICS JOURNAL | 2023年 / 15卷 / 01期
基金
中国国家自然科学基金;
关键词
Light emitting diodes; Optical transmitters; Visible light communication; Optical saturation; Optical receivers; Optical filters; Image color analysis; Visible light communications; physical-layer network coding; ambient light noise; photodiode saturation;
D O I
10.1109/JPHOT.2023.3240438
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
Visible light communications (VLC) is a good candidate technology for the 6th generation (6G) wireless communications. Red, green, and blue (RGB) light-emitting diodes (LEDs) based VLC has become an important research branch due to its low price and high reliability. However, the saturation of photodiode (PD) caused by the ambient background light may seriously degrade the bit error rate (BER) performance of an RGB-VLC system's three spatially uncoupled information streams (i.e., red, green, and blue LEDs can transmit different data packets simultaneously) in practical applications. To mitigate the ambient light interference in point-to-point RGB-VLC systems, we propose, PNC-VLC, a network-coded scheme that uses two LEDs with the same color at the transmitter to transmit two different data streams and we make use of the naturally overlapped signals at the receiver to formulate physical-layer network coding (PNC). The adaptivity of PNC-VLC could effectively improve the BER degradation problem caused by the saturation of PD under the influence of ambient light. We conducted simulations based on the parameters of commercial off-the-shelf (COTS) products to prove the superiority of the PNC-VLC under the influence of four typical illuminants. Simulation results show that the PNC-VLC system can maintain a better and more stable system BER performance under different ambient background light conditions. Remarkably, with 2/3 throughput efficiency, PNC-VLC can bring 133.3% gain to the BER performance when compared with RGB-VLC under the Illuminant A interference model, making it a good option for VLC applications with unpredictable ambient background interferences.
引用
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页数:10
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