Performance of a nonlinear energy harvesting CR-enabled D2D network with censoring and NOMA

In order to improve connection density and spectrum efficiency, hybrid transmission is integrated with non- orthogonal multiple access (NOMA) enabled Device-to-Device (D2D) networks for 5 G and future cellular networks. Both downlink and uplink NOMA are used by the D2D nodes during their information transmission. The goal of this study is to evaluate the end-to-end (e2e) performance of a cooperative D2D network in which D2D sources (DSs) exchange information with corresponding D2D destinations (DDs) via a relay in addition to harvesting energy. Cellular users' (CUs) and power transfer units' (PTUs') radio frequency (RF) signals are used to harvest energy by the DSs. The cognitive radio (CR) technology is used by the proposed D2D system to locate the vacant CU spectrum. In order to increase transmission efficiency, it uses a censoring technique that eliminates the DSs connected to bad quality channels. An analytical framework has been developed according to the proposed network scenario under an interference constraint. According to the proposed network scenario, new analytical expressions of outage and total network throughput are developed. Network throughput and outage performance are studied by adjusting several network parameters. This work proposes two algorithms: one for censoring of users and other for maximization of throughput.