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UAV Secure Downlink NOMA Transmissions A Secure Users Oriented Perspective

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Document pages: 15 pages

Abstract: This paper proposes a secure downlink multi-user transmission scheme enabledby a flexible unmanned aerial vehicle base station (UAV-BS) and non-orthogonalmultiple access (NOMA). According to their heterogeneous service requirements,multiple legitimate users are categorized as security-required users (SUs) andquality of service (QoS)-required users (QUs), while these QUs can potentiallyact as internal eavesdroppers which are curious about the secrecy transmissionsof SUs. In such a context, our goal is to maximize the achievable minimumsecrecy rate among SUs through the joint optimization of user scheduling, powerallocation, and trajectory design, subject to the QoS requirements of QUs andthe mobility constraint of UAV-BS. Due to the non-convexity of the problem, anefficient iterative algorithm is firstly proposed, based on the alternativeoptimization (AO) and successive convex approximation (SCA) methods and alongwith a penalty-based algorithm to deal with the introduced binary integervariables, to obtain a sub-optimal solution. Then, we propose an SUs-orientedlow-complexity algorithm by taking advantage of the inherent characteristics ofthe optimization problem, which can efficiently reduce the computationalcomplexity and can act as a reasonable initial solution for the previousiterative algorithm to achieve better performance. Finally, the superiority ofour proposed scheme compared with the conventional orthogonal multiple access(OMA) one is validated by numerical simulation results.

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