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This paper studies the performance of a downlink non-orthogonal multipleaccess (NOMA) based cooperative network with maximal ratio transmission/receiveantenna selection (MRT/RAS) over Nakagami-m fading channels in the presence ofchannel estimation errors (CEEs). In the system, a base station communicateswith multiple mobile users through a half duplex channel state informationbased amplify-and-forward relay. All nodes are equipped with multiple antennasand the hybrid diversity technique MRT/RAS is employed in both hops. The outagebehavior of the system is investigated by driving closed-form expression foroutage probability (OP). In addition, the corresponding lower and upper boundsof the derived OP are obtained. Moreover, the behavior of the system is studiedin high signal-to-noise ratio region by obtaining an error floor value in thepresence of CEE as well as achieving diversity and array gains in the absenceof CEE. Finally, the analytical results in the presence and absence of the CEEsare verified by the Monte Carlo simulations. Results show that the MRT/RASscheme enhances the OP significantly and is much more robust to the CEEs incomparison with the single antenna case.

Performance of Cooperative NOMA with MRT/RAS in Nakagami-m Fading Channels with Channel Estimation Errors