Outage analysis of aerial semi-grant-free NOMA systems☆

Hongjiang Lei; Chen Zhu; Ki-Hong Park; Imran Shafique Ansari; Weijia Lei; Hong Tang; Kyeong Jin Kim

doi:10.1016/j.dcan.2023.10.001

›› 2024, Vol. 10 ›› Issue (5) :1529 -1541. DOI: 10.1016/j.dcan.2023.10.001

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Outage analysis of aerial semi-grant-free NOMA systems^☆

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Abstract

In this paper, we analyze the outage performance of Unmanned Aerial Vehicles (UAVs)-enabled downlink Non-Orthogonal Multiple Access (NOMA) communication systems with the Semi-Grant-Free (SGF) transmission scheme. A UAV provides coverage services for a Grant-Based (GB) user and one Grant-Free (GF) user is allowed to utilize the same channel resource opportunistically. The analytical expressions for the exact and asymptotic Outage Probability (OP) of the GF user are derived. The results demonstrate that no-zero diversity order can be achieved only under stringent conditions on users' quality of service requirements. Subsequently, an efficient Dynamic Power Allocation (DPA) scheme is proposed to relax such data rate constraints. The analytical expressions for the exact and asymptotic OP of the GF user with the DPA scheme are derived. Finally, Monte Carlo simulation results are presented to validate the correctness of the derived analytical expressions and demonstrate the effects of the UAV's location and altitude on the OP of the GF user.

Keywords

Unmanned aerial vehicle / Non-orthogonal multiple access / Semi-grant-free / Outage probability

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Hongjiang Lei, Chen Zhu, Ki-Hong Park, Imran Shafique Ansari, Weijia Lei, Hong Tang, Kyeong Jin Kim. Outage analysis of aerial semi-grant-free NOMA systems^☆. , 2024, 10(5): 1529-1541 DOI:10.1016/j.dcan.2023.10.001

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