On the Energy Efficiency Maximization of NOMA-Aided Downlink Networks With Dynamic User Pairing

• Published in: IEEE access Vol. 10; pp. 35131 - 35145
• Main Authors: Nguyen, Kha-Hung, Nguyen, Hieu V., P. Le, Mai T., Sanguinetti, Luca, Shin, Oh-Soon
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Approximation; Array signal processing; Beamforming; Complexity theory; Continuity (mathematics); convex optimization; Design optimization; Downlinking; Energy efficiency; Massive MIMO; Maximization; Mixed integer; NOMA; non-orthogonal multiple access (NOMA); Nonorthogonal multiple access; Optimization; Resource management; Robust design; Uncertainty; user pairing
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2022.3162875

This study investigates a combined system comprising non-orthogonal multiple access (NOMA) and beamforming in a downlink network. To fully exploit the advantages of NOMA, user (UE) pairing and beamforming design are jointly optimized via a generalized model for UE association, subject to energy efficiency maximization. Owing to the combination of binary variables and nonconvex constraints, the resulting optimization problem belongs to the class of mixed-integer nonconvex programming. An innovative algorithm, integrating the inner-approximation and Dinkelbach methods, is proposed herein to address a nonconvex fractional function. By introducing a pairing matrix and relaxing the binary variables into continuous ones, our approach is capable of reaching an optimal solution, where two arbitrary UEs are optimally paired regardless of geographical or spatial constraints. For practical scenarios, we further propose a robust design to manage the effect of channel estimation errors under settings involving channel uncertainty. Numerical results show that our proposed designs, even with the presence of the imperfect channel state information at the base station, significantly outperform the conventional beamforming and existing pairing schemes.