On Improving 5G Internet of Radio Light Security Based on LED Fingerprint Identification Method Dayu Shi, Xun Zhang, Lina Shi, Andrei Vladimirescu, Wojciech Mazurczyk, Krzysztof Cabaj, Benjamin Meunier, Kareem Ali, John Cosmas, Yue Zhang January 2021 PDF Cite DOI Previous 3D arrangement of LEDs for indoor VLC applications