QoS-Based Resource Allocation in Multicarrier NOMA-IBFD Cellular System With Sectorization

In this study, we examine the performance of a multicell cellular system featuring an Non-orthogonal multiple access (NOMA) - In-band full duplex transmission (IBFD) enabled base station to improve spectral efficiency. The simultaneous transmission of multiple signals on the same frequency resource introduces several interferences and necessitates higher transmission powers to meet user’s quality of service (QoS) requirements. To address this, we introduce a heuristic approach aimed at optimizing subcarrier and power allocation with the goal of minimizing required downlink powers while ensuring QoS for each user. We also present decodability order for downlink (DL) NOMA in the presence of uplink users. Subsequently, we extend our investigation at sector level to obtain a comprehensive understanding of network dynamics within a more confined coverage area. We use orthogonal resource allocation and half duplex scenarios as benchmarks to evaluate the performance of proposed algorithm. Numerical simulations reveal that NOMA-IBFD requires lower transmit powers to meet QoS compared to the orthogonal multiple access (OMA) system, despite having more interference terms. Our key findings emphasize that the proposed algorithm not only enables users with weaker channel conditions to meet QoS requirements but also allows users with stronger channel conditions to contribute significantly to system throughput enhancement, thereby providing enhanced energy efficiency.