A Two-Stage Power Allocation-Based NOMA Architecture for Optical Camera Communication

Visible light communication (VLC) is an emerging technology that provides ubiquitous connectivity by complementing radio frequency for the fifth-generation (5G) wireless and beyond. However, inadequacies in modulation bandwidth of light-emitting diode (LED) reduce achievable data rate image sensor-based VLC, also known as optical camera (OCC). Hence, densely deployed OCC networks, multiple channel access a major challenge faced when supporting large numbers users. This article proposes nonorthogonal based (NOMA-OCC) system, where each LED can transmit two separate signals different power levels superimposing them into one signal. An sensor receiver system designed to these users implying intensity threshold. The distinct capacities both well sum point were analyzed. In order validate proposed NOMA-OCC scheme, bit error performance investigated through simulation channels then compared with conventional shift on-off keying scheme.