NOMA for Energy-Efficient LiFi-Enabled Bidirectional IoT Communication

In this paper, we consider a light fidelity (LiFi)-enabled bidirectional Internet of Things (IoT) communication system, where visible and infrared are used in the downlink uplink, respectively. order to efficiently improve energy efficiency (EE) LiFi-IoT non-orthogonal multiple access (NOMA) with quality-of-service (QoS)-guaranteed optimal power allocation (OPA) strategy is applied maximize EE both uplink channels. We derive closed-form OPA sets based on identification decoding orders channels, which can enable low-complexity allocation. Moreover, propose an adaptive channel QoS-based user pairing approach by jointly considering users' gains QoS requirements. further analyze outage probability (UOP) performance channels system. Extensive analytical simulation results demonstrate superiority NOMA comparison orthogonal (OMA) typical channel-based strategies. It also shown that proposed greatly outperforms individual channel/QoS-based approaches, especially when users have diverse