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In this paper, the integration of cooperative non-orthogonal multiple access(CNOMA) and power splitting based simultaneous wireless information and powertransfer (SWIPT) is proposed to improve the spectral and energy efficiency.Moreover, different orbital angular momentum (OAM) based signals are alsoconsidered in this paper to transmit additional symbols to cell center user(CCU) and cell edge user (CEU). In the proposed technique, CCU is used asenergy-constrained relay to forward signal to CEU. CCU harvests energy from thetransmitted signal by the BS using the power splitting technique. Theadditional symbols are transmitted from the BS to CCU and CEU by utilizingdifferent modes of OAM. This paper investigates the ergodic sum capacity (ESC)of the proposed technique along with analytical derivations over Rician fadingchannels. Finally, the performance in terms of ESC and energy efficiency overconventional technique compared to conventional multiple access is demonstratedby analysis and simulation.

Channel Capacity Enhancement of SWIPT based CNOMA Downlink Transmission with Orbital Angular Momentum over Rician Fading Channel