In recent years, non-orthogonal multiple access (NOMA) has emerged as a transformative technique, revolutionising spectral efficiency and enabling massive connectivity in next-gen wireless communication. This ground breaking research delves into multiple input multiple output non-orthogonal multiple access (MIMO NOMA) systems' power allocation strategies, prioritising system throughput and user fairness. Our innovative approach leverages QPSK modulation in a comprehensive system model, meticulously simulating performance across various variables, including user distance and power differentials. Across varying bandwidths, our model showcases remarkable improvements in user experience, with a jaw-dropping 12 dB/Hz increase in spectral efficiency at a mere 1 dB SNR boost, coupled with a staggering 15 × 10-3 and 12 × 10-3 reduction in outage probabilities at 0.17 dB. Even in the challenging Rayleigh fading channel, the bit error rate (BER) sees substantial reductions, reaffirming the prowess of our proposed methodology.
Bharathi et al. (Thu,) studied this question.