Power Allocation Stable Matching User Pairing (SMUP) in Non-orthogonal Multiple Access (NOMA) with Simultaneous Wireless Information and Power Transfer (SWIPT)

Non-orthogonal multiple access (NOMA) is a potentially spectral efficient approach for beyond-fifth-generation wireless networks. This paper investigates the joint user pairing, and power allocation problem in a cooperative-NOMA (CNOMA) with simultaneous wireless information and power transfer (SWIPT) capabilities. The purpose of this work is to enhance the sum rate of users with poor channel conditions while guaranteeing residual energy for paired users with good channel conditions as compensation for their cooperation. To overcome this challenge, we divided it into two parts: power allocation (PA) and user pairing (UP). The particle swarm optimization (PSO) method is utilized to address the PA issue, whereas the stable matching (SM) algorithm is utilized to solve the UP problem. After participating in relaying the far user signal, the proposed algorithm considers the benefits of the user with superior channel conditions in the form of residual energy. The simulation results highlight the proposed model's behavior and show that it produces a higher average system sum rate than the standard CNOMA with SWIPT.