NOMA-Aided Multi-UAV Communications in Full-Duplex Heterogeneous Networks

Abstract

To address spectrum scarcity in unmanned aerial vehicle (UAV) communications, non-orthogonal multiple access (NOMA) aided multi-UAV communications in full-duplex (FD) heterogeneous networks (HetNets) is investigated in this paper. Specifically, an ergodic capacity analysis of NOMA-aided multi-UAV communications in FD-HetNets is conducted through a moment generating function (MGF) approach within a stochastic geometry framework. By employing the MGF approach to evaluate ergodic capacity, exact expressions that are simpler to evaluate are obtained. When compared against half-duplex HetNets, i.e., HD-HetNets, FD-HetNets with effective interference management enable higher ergodic capacity to be obtained by the macro base station and UAVs. Furthermore, we show that it is possible for NOMA-aided multi-UAV communications in FD-HetNets to achieve higher ergodic sum capacity and ergodic capacity gains than HD-HetNets while supporting more UAVs at low altitude due to a stronger desired signal. Even with lower levels of self-interference (SI) suppression and strong phase noise, NOMA-aided multi-UAV communications in FD-HetNets is still able to achieve higher ergodic sum capacity over HD-HetNets. Therefore, the attractiveness of NOMA-aided multi-UAV communications in FD-HetNets is highlighted as a promising solution towards improving spectrum utilization in UAV communications.

Improving Connectivity in 6G Maritime Communication Networks With UAV Swarms

“…The road to realize 6G networking includes radical departures from conventional wireless architectures, where highly dynamic nodes are deployed to different network areas, ensuring increased resiliency against outages [15], [16]. Moreover, UAVs act as an intermediate layer to terrestrial and satellite segments, providing connectivity in remote and rural environments, fast recovery from disasters, and ondemand radio-resources [7], [17]- [19].…”

“…the one with the lowest power at the reception, is decoded without any interference. The feasible {S→R} link set is denoted by F n SR with cardinality of F n SR , considering that after SIC, the UAV has managed to decode packets from n maritime sources, and that the set's members fulfill (15).…”

Orthogonal variable spreading factor encoded unmanned aerial vehicle‐assisted nonorthogonal multiple access system with hybrid physical layer security

“…The authors found that NOMA‐assisted UAV systems outperformed conventional UAV communication systems. A heterogeneous network (HetNet) using full‐duplex (FD) communication under NOMA‐assisted multi‐UAV transmission was investigated by the authors of [10] to assess inadequate spectra in UAV communications. By featuring more UAVs at lower level altitudes due to the demand for stronger signals, the authors demonstrated the effectiveness of NOMA‐assisted multi‐UAV communications under FD HetNets in terms of achieving higher ergodic sum capability and ergodic capacity gains than half‐duplex HetNets.…”

UAV-Enabled Wireless Backhaul Networks Using Non-Orthogonal Multiple Access

“…By basing on NOMA designs, a multiobjective joint optimization of resource and power allocation was well addressed in [15] while ensuring the minimum transmit power. There has been a number of works that focused on utilizing NOMA in UAV communication system [16]- [30], [32]. Ernest et al [16] computed the ergodic capacity of NOMA-aided systems with a great aim of alleviating the spectrum dearth.…”

“…There has been a number of works that focused on utilizing NOMA in UAV communication system [16]- [30], [32]. Ernest et al [16] computed the ergodic capacity of NOMA-aided systems with a great aim of alleviating the spectrum dearth. In virtue of moment generating function (MGF) technique, and together with stochastic geometry; it was proven that unlike half duplex (HD), higher spectrum efficiency is attainable in NOMA aided full duplex (FD) -HetNets.…”