In this study, we introduce a cooperative non-orthogonal multiple access (NOMA) system model for simultaneous wireless information and power transfer (SWIPT) with the assistance of a relay node, all within the context of full-duplex (FD) communication mode. Within this framework, we consider the utilization of two distinct protocols: the power splitting protocol (PSR) and the time switching protocol (T-SR). These protocols are designed to accommodate both delay-limited-transmission (DLT) and delay-tolerant-transmission (DTT) modes, enabling efficient energy harvesting and information processing at the relay user. The paper also presents comprehensive closed-form expressions for various performance metrics, including outage probability, throughput, ergodic rate, and energy efficiency (EE). Furthermore, we explore the impact of key parameters such as energy harvesting time, power splitting ratio, energy harvesting efficiency, source data rate, and inter-node distance across normal and high signal-to-noise ratio (SNR) regimes. Our findings demonstrate that enhanced energy harvesting efficiency leads to improved overall system performance. Notably, our results underscore the superiority of NOMA over conventional orthogonal multiple access schemes, particularly in terms of energy efficiency.
KeywordsNon-orthogonal multiple access (NOMA) • energy harvesting (EH) • message processing (MP) • radio-frequency (RF) • power-splitting relaying (PSR) • time switching-based relaying (TSR) • decode-and-forward (DF) • full-duplex (FD), • energy efficiency (EE).