Optimizing Time Scheduling for Hybrid OMA-NOMA Systems Under Imperfect SIC: An \alpha-Fair Utility Approach

• Published in: 2024 IEEE 99th Vehicular Technology Conference (VTC2024-Spring) pp. 1 - 5
• Main Authors: Mouni, Nemalidinne Siva, Agarwal, Pranay, Ramamoorthi, Yoghitha, Kumar, Abhinav
• Format: Conference Proceeding
• Language: English
• Published: IEEE 24-06-2024
• Subjects: Adaptation models; alpha -fair scheduling; imperfect successive interfer-ence cancellation (SIC); Interference cancellation; NOMA; non-orthogonal multiple access (NOMA); power allocation; user pairing; Vehicular and wireless technologies
• ISSN: 2577-2465
• DOI: 10.1109/VTC2024-Spring62846.2024.10683480

We formulate a scheduling problem to derive the optimal time fraction jointly for a hybrid orthogonal multiple access (OMA)-non-orthogonal multiple access (NOMA) system using the \alpha ·fair utility function, while accounting for imper-fections in successive interference cancellation (SIC). Our study demonstrates that the optimal solution derived through a solver matches the theoretical results. Furthermore, we assess the performance of these derived time fractions in comparison to an existing adaptive user pairing (AUP) algorithm, designed to mitigate imperfections in SIC. Through extensive simulations, we illustrate that the derived time fraction consistently yields improved mean user link rates when employed with the AUP algorithm, across varying levels of imperfections in SIC, under the log-rate model.