BER Performance Evaluation for the Downlink NOMA System over Different Fading Channels with Different Modulation Schemes

Non-orthogonal multiple access (NOMA) is one of the proposed and hopeful multiple access techniques for fifth-generation of cellular networks. This paper investigates bit error rate (BER) Performance of downlink NOMA technique with various modulation techniques namely Binary phase shift keying (BPSK), Quadrature phase shift keying (QPSK), and Quadrature amplitude shift keying (QAM) under the effect of various fading channels. The performance of transmission modes are evaluated by calculating the BER of different number of User Equipment receivers (UEs) in downlink NOMA system from near User Equipment (NU) up to far user Equipment (FU) versus energy per bit to noise power spectral density ratio (Eb/No) under the effect of Additive white Gaussian noise (AWGN), Rician fading and Rayleigh fading channel with different modulation schemes.to have some insightful results about the Quality of service (QoS) of each individual user.