Abstract
Cooperative NOMA is a method to improve the system performance, this could be done by enabling a user to relay the signal to other users or a dedicated relay. Several dedicated hybrid relays are distributed to forward the source’s signal to the destinations to further enhance the system and serve the users at the cell edge. However, operating several relays simultaneously reduces the spectral efficiency because they need orthogonal channels. Thus, hybrid relay selection is proposed and investigated as a cooperative technique to improve NOMA performance. The relay that provides the highest SNR channel is enabled to relay the signal while the other relays are disabled. BER, outage probability, and channel capacity are measured and investigated to assess the overall system performance. These indicators show that this relay selection is feasible, moreover, relay selection enhances the system reliability, flexibility, and data throughput.
Published Version
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