BER performance of NOMA network with majority based JTRAS scheme in practical impairments

We investigate bit error rate (BER) performance of majority-based joint transmit and receive antenna selection (JTRAS-maj) in non-orthogonal multiple access (NOMA) networks with practical impairments including channel estimation error (CEE), feedback delay (FD) and successive interference cancellation (SIC) error. The closed-form expression of the exact BER is derived for binary phase shift keying modulation in Nakagami-m fading channels. In the high signal-to-noise ratio region, asymptotic and error floor expressions are also obtained in the absence and presence of the practical impairments, respectively. The analytical results verified by simulations reveal that non-zero and zero diversity gains are achieved in these cases, respectively. Also, the BER performance of users with worse channel gains is significantly improved as the number of receive antennas increases or channel condition enhances. In addition, the system works well up to some values of CEE, FD and SIC error.