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This study proposes the integration of a cooperative non-orthogonal multipleaccess (CNOMA) and improved hybrid simultaneous wireless information and powertransfer (IHS SWIPT) protocol (termed as CNOMA-IHS) to enhance the spectralefficiency (SE) of a downlink (DL) CNOMA communication system. CNOMA-IHS schemecan enhance the ergodic sum capacity (ESC) and energy efficiency (EE) of DLCNOMA by transferring additional symbols towards the users and energize therelay operation as well without any additional resources (e.g., timeslot/frequency/code). The analytical and simulation results indicate that theproposed CNOMA-IHS scheme outperforms other existing SWIPT-based schemes (e.g.,CNOMA with hybrid SWIPT, CNOMA with power-splitting SWIPT, wireless-poweredCNOMA, CNOMA with time switching SWIPT, and orthogonal multiple access with IHSSWIPT) in terms of the ESC. Moreover, the CNOMA-IHS scheme also enhances EEcompared with other conventional TS-SWIPT-based schemes, which is alsoillustrated by the simulation results. In addition, the proposed CNOMA-IHSscheme with the considered EE optimization technique outplayed the proposedCNOMA-IHS scheme without EE optimization and other existing TS-SWIPT-basedschemes in terms of EE.

Performance Evaluation of Cooperative NOMA-based Improved Hybrid SWIPT Protocol