  The antenna selection (AS) in non-orthogonal multiple access (NOMA) networks
is still a challenging problem since finding optimal AS solution may not be
available for all channel realizations and has quite computational complexity
when it exists. For this reason, in this paper, we develop a new suboptimal
solution, majority based transmit antenna selection (TAS-maj), with significant
reduction in computational complexity. The TAS-maj basically selects the
transmit antenna with the majority. It is more efficient when compared to
previously proposed suboptimal AS algorithms, namely max-max-max (A^3) and
max-min-max (AIA) because these schemes are merely interested in optimizing the
performance of the strongest and weakest users, respectively at the price of
worse performance for the remaining users. On the other hand, the TAS-maj
scheme yields better performance for more than half of mobile users in the NOMA
networks. In this paper, we consider a multiple-input multiple-output
communication system, where all the nodes are equipped with multi-antenna.
Besides the TAS-maj is employed at the base station, a maximal ratio combining
(MRC) is also employed at each mobile user in order to achieve superior
performance. The impact of the channel estimation errors (CEEs) and feedback
delay (FD) on the performance of the TAS-maj/MRC scheme is studied in the NOMA
network over Nakagami-m fading channels.
