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In this work, we investigate the transmission sum rate as well as the secrecysum rate of indoor visible light communication (VLC) networks for mobiledevices with the power domain non-orthogonal multiple access (NOMA)transmission, where multiple legitimate users are equipped with photodiodes(PDs). We introduce a body blockage model of the legitimate users as well asthe eavesdropper to focus on the case where the communications fromtransmitting light-emitting diodes (LEDs) to receiving devices are blocked bythe bodies of receiving users. Furthermore, in order to improve the secrecywithout any knowledge of the channel state information (CSI) of theeavesdropper, a novel LED arrangement is introduced to reduce the overlappingarea covered by LED units supporting different users. We also propose two LEDoperation strategies, called simple and smart LED linking, and evaluate theirperformance against the conventional broadcasting in terms of transmission sumrate and secrecy sum rate. Through computer simulations, the superiority of ourproposed strategies is demonstrated.

Secrecy Design of Indoor Visible Light Communication Network under Downlink NOMA Transmission