Abstract
In this paper, we propose an optimal user selection scheme for cooperative non-orthogonal multiple access (NOMA) networks with simultaneous wireless information and power transfer (SWIPT). By considering decode and forward (DF) protocol, SWIPT is employed at near users to relay information to far users via applying a user selection scheme that selects an optimal pair of near and far users and ensures the correct information decoding at the near user within an adaptive power allocation coefficient (PAC) range. Closed-form expressions for the outage probability of the selected near and far users are derived. We show that the selected near and far users can achieve a diversity gain of N and N + F, respectively, with a significant coding gain, where N and F are the number of near and far users. Simulation results investigate that the proposed scheme can achieve an optimal outage performance over the state of arts.