Performance of transmit antenna selection in non-orthogonal multiple access for 5G systems

Transmit antenna selection is very common technique to reduce system complexity and power consumption at transmitter side while maintaining nearly the same performance of multiple antennas. In this paper, we introduce a transmit antenna selection (TAS) scheme for non orthogonal multiple access (NOMA) to improve the performance in terms of total sum rate. We consider a downlink multiuser multi-input single-output communication system where a single base station equipped with multiple antennas with a single radio frequency (RF) chain communicate with several users equipped with single antenna using NOMA. We verify that TAS at the base station considerably provides higher sum rate compared to single antenna system by exploiting spatial diversity.