Article: Database systems under Rayleigh fading channels: MIMO-NOMA based performance evaluation modelling Journal: International Journal of System of Systems Engineering (IJSSE) 2026 Vol.16 No.1 pp.31 - 57 Abstract: 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. Inderscience Publishers - linking academia, business and industry through research

Title: Database systems under Rayleigh fading channels: MIMO-NOMA based performance evaluation modelling

Authors: C. Bharathi; H.S. Manjunatha Reddy

Addresses: Department of Electronics and Communication Engineering, Global Academy of Technology, Visvesvaraya Technological University, Bengaluru, Karnataka, 590 018, India ' Department of Electronics and Communication Engineering, Global Academy of Technology, Visvesvaraya Technological University, Bengaluru, Karnataka, 590 018, India

Abstract: 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.

Keywords: BER; bit error rate; Rayleigh; spectrum efficiency; outage probability; MIMO; multiple input multiple output; database systems; NOMA; non-orthogonal multiple access; simultaneous multi-user communication.

DOI: 10.1504/IJSSE.2026.152420

International Journal of System of Systems Engineering, 2026 Vol.16 No.1, pp.31 - 57

Received: 26 Jul 2023
Accepted: 03 Oct 2023
Published online: 19 Mar 2026 *

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Title: Database systems under Rayleigh fading channels: MIMO-NOMA based performance evaluation modelling

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