Secrecy Performance of a Multi-NOMA-MIMO System in the UEH Relaying Network Using the PSO Algorithm

In this paper, we investigate the secrecy performance of nonorthogonal multiple access (NOMA) system in an untrusted relaying energy harvesting (UEH) network with multiple-input multiple-output (MIMO) architecture using maximum ratio transmission (MRT) and maximal combining (MRC) techniques. network, a source communicates users help composed components amplify-and-forward (AF) protocol. These relay nodes are equipped single antenna employ power-splitting (PS) protocol to harvest from received signals. Moreover, improve outage protect confidential information acts as jammer generate artificial noise (AN). To evaluate each user overall system, derive closed-form expressions probability (SOP) over Rayleigh fading channels use Monte Carlo simulation verify accuracy these analytical results. analyze data rate, maximization problem sum rate (SSR) is solved by applying particle swarm optimization (PSO) algorithm based on power allocation (PA). results also validated optimal exhaustive search method. Furthermore, compare MIMO/NOMA MIMO/OMA systems examine effects various parameters characterize effectiveness both systems.