Dual-UAV-Enabled Secure Communications: Joint Trajectory Design and User Scheduling

This article investigates the non-orthogonal multiple access (NOMA) enhanced unmanned aerial vehicle (UAV)-to-Everything (U2X) frameworks. A novel 3-Dimension framework for providing wireless services to randomly roaming NOMA receivers (Rxs) in the sphere space is proposed by utilizing stochastic geometry tools. In an effort to evaluate the performance of the proposed framework, we first derive closed-form expressions for the outage probability and the ergodic rate of paired NOMA Rxs.For obtaining more insights, we investigate the diversity order and the high signal-to-noise (SNR) slope of NOMA enhanced U2X frameworks. We also derive the spectrum efficiency in both NOMA and orthogonal multiple access (OMA) enhanced U2X frameworks. Our analytical results demonstrate that the diversity order and the high SNR slope of the proposed framework are m and one, respectively.Numerical results are provided to confirm that: i) the proposed NOMA enhanced U2X frameworks have superior outage performance and spectrum efficiency compared with the OMA-enhanced U2X frameworks; and ii) for the case of fixed LoS probability, the outage performance of paired NOMA Rxs mainly depends on users with poor channel conditions.

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“…Proof. Similar to Appendix C, with interchanging z f with z n * , we can obtain the desired result in (20), and the proof can is complete.…”

Section: Proof Please Refer To Appendix Amentioning

confidence: 70%

Non-Orthogonal Multiple Access in Multi-UAV Networks

Hou

Liu

Sun

et al. 2019

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)

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“…Proof: By applying the idea of the proof for Lemma 1 in [14], we can always set e k [n] to be zero if R k [n] − R e,k [n] is negative. Now, we turn our attention to tackle the binary variables in problem (7). Instead of simply relaxing E into a continuous one, a variational approach is introduced.…”

Section: Problem Formulation and Proposed Designmentioning

confidence: 99%

“…Some preliminary works have been devoted to secure UAV-aided communications by leveraging physical-layer security (PLS). Specifically, the research in [7] focused on improving the worst-case secrecy rate among mobile users by generating a jamming signal in order to confound Eves. The work in [6] studied secrecy energy efficiency in multiple UAV-aided wireless networks by leveraging cooperation.…”

Section: Introductionmentioning

confidence: 99%

Latency-Minimized Design of secure transmissions in UAV-Aided Communications

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Unmanned aerial vehicles (UAVs) can be utilized as aerial base stations to provide communication service for remote mobile users due to their high mobility and flexible deployment. However, the lineof-sight (LoS) wireless links are vulnerable to be intercepted by the eavesdropper (Eve), which presents a major challenge for UAV-aided communications. In this paper, we propose a latency-minimized transmission scheme for satisfying legitimate users' (LUs') content requests securely against Eve. By leveraging physical-layer security (PLS) techniques, we formulate a transmission latency minimization problem by jointly optimizing the UAV trajectory and user association. The resulting problem is a mixed-integer nonlinear program (MINLP), which is known to be NP hard. Furthermore, the dimension of optimization variables is indeterminate, which again makes our problem very challenging. To efficiently address this, we utilize bisection to search for the minimum transmission delay and introduce a variational penalty method to address the associated subproblem via an inexact block coordinate descent approach. Moreover, we present a characterization for the optimal solution. Simulation results are provided to demonstrate the superior performance of the proposed design.

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“…In each iteration, the closed-form expressions of the user scheduling binary integer variables were obtained given fixed transmit powers and trajectories of dual UAVs, and then SCA methods were exploited to deal with the non-convexity of other sub-problems. In [15], a similar idea was investigated in the presence of multiple external ground eavesdroppers. Given the constant transmit power, the collision avoidance constraint was further taken into consideration for the safety of dual UAVs.…”

Section: Uav-enabled Hybrid Secure Transmission Schemementioning

confidence: 99%

UAV-Involved Wireless Physical-Layer Secure Communications: Overview and Research Directions

Wang

Zhang

Jiang

2019

IEEE Wireless Commun.

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Due to their flexible deployment and on-demand mobility, small-scale unmanned aerial vehicles (UAVs) are anticipated to be involved in widespread communication applications in the forthcoming fifthgeneration (5G) networks. However, the confidentiality of UAV communication applications is vulnerable to security threats due to the broadcast nature and dominant line-of-sight (LoS) channel conditions, and physical-layer security (PLS) technique can be applied for secrecy performance enhancement in such a context. On the other hand, it is also promising to exploit UAVs to cooperatively protect secure communications. This article provides an overview of the recent research efforts on UAV-involved secure communications at the physical layer. We focus on the design of secure transmission schemes according to different roles of UAVs and the optimization of introduced degrees of freedom (DoFs) by the unique characteristics of UAVs. We also propose some future research directions on this topic.

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Dual-UAV-Enabled Secure Communications: Joint Trajectory Design and User Scheduling

Cited by 186 publications

References 38 publications

Non-Orthogonal Multiple Access in Multi-UAV Networks

Non-Orthogonal Multiple Access in Multi-UAV Networks

Latency-Minimized Design of secure transmissions in UAV-Aided Communications

UAV-Involved Wireless Physical-Layer Secure Communications: Overview and Research Directions

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