Secure NOMA-Based Indoor VLC Networks with Body Blockage Model

In this work, the performance of indoor visible light communication (VLC) networks with mobile devices in the presence of a passive eavesdropper is investigated in terms of the achievable throughput and secrecy. We consider a body blockage model of the users as well as the eavesdropper in order to capture the effect when the communication links from light-emitting diodes (LEDs) to the devices are blocked by their bodies. We introduce a novel LED arrangement as well as LED linking strategy under the framework of non-orthogonal multiple access (NOMA) so as to improve the secrecy performance and throughput without any knowledge of the channel state information of the eavesdropper. The effectiveness of the proposed system is demonstrated by simulation results.