Non-orthogonal multiple access (NOMA) has been widely recognised as a promising technology due to its potential to achieve high spectral efficiency and massive connectivity. The authors study a multiple-relay multiple-input and multiple-output cooperative NOMA system. In particular, a joint relay-and-antenna selection (JRAS) scheme with coordinated direct and relay transmission is proposed, which makes it possible to maximise the instantaneous rate of far user with high quality ofservice (QoS) priority while guaranteeing the requirement of near user with low QoS priority. Then, closed-form expressions for outage probability are derived and asymptotic expressions for outage probability in the high signal-to-noise ratio regime are also obtained in order to provide further insights. Analysis results demonstrate that the proposed JRAS scheme significantly enhances the outage performance for cooperative NOMA, and simulation results are provided to verify the accuracy of theoretical analysis.

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Joint relay-and-antenna selection for cooperative non-orthogonal multiple access

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