In this paper, we study physical layer security of an unmanned aerial vehicle (UAV)-assisted communication system, where a UAV collects data from a sensor node and UAV-eavesdropper tends to overhear confidential information. In particular, assuming Fisher-Snedecor fading environment, we derive the closed-form expression of the intercept probability and we examine the effect of different system/channel parameters on this performance metric. Numerical results are also presented to verify analytical result; and to highlight the impact of specific fading/shadowing conditions over the main-UAV link and UAV-eavesdropper’s link, as well as the impact of UAVs’ positions.
In this paper, we study physical layer security of an unmanned aerial vehicle (UAV)-assisted communication system, where a UAV collects data from a sensor node and UAV-eavesdropper tends to overhear confidential information. In particular, assuming Fisher-Snedecor fading environment, we derive the closed-form expression of the intercept probability and we examine the effect of different system/channel parameters on this performance metric. Numerical results are also presented to verify analytical result; and to highlight the impact of specific fading/shadowing conditions over the main-UAV link and UAV-eavesdropper’s link, as well as the impact of UAVs’ positions.
In this paper, particular study of security of ground-to-unmanned aerial vehicle (UAV) communication link, on physical layer, in the presence of a ground eavesdropper is given. We characterize the UAV as data collector, which is distributed randomly in a horizontal plane of certain cylindrical region, while a ground user that sends data up to UAV, is located in the centre of cylinder's base. Furthermore, we assume that the eavesdropper is randomly located within a circle which defines the base of the cylindrical region. The main (user-to-UAV) channel is characterized as severely corrupted by the path loss effect, while the wiretap (source-to-eavesdropper) channel is subjected to Fisher-Snedecor fading. Under aforementioned system/channel scenario, the probability of intercept events is investigated. In more details, throughout numerical results, the impact of the predefined cylinder's height and its base's radius, as well as the impact of the fading depth and shadowing severity of the ground wiretap channel, on the intercept probability, is analysed. Related concluding remarks are also given.
Unmanned aerial vehicles (UAVs) will be extensively utilized in various Internet of Things (IoT) scenarios due to their flexible mobility and rapid on-demand deployment. It becomes necessary and urgent to investigate the secrecy performance of the UAV IoT communication systems because of the open characteristics of wireless channels. In this article, the physical layer security of UAV IoT communication systems is studied, in which a ground IoT device transmits some confidential messages to a UAV hovering in the air, while a random number of eavesdroppers are randomly positioned around the ground source. The ground-to-air channel is assumed to experience Rician fading for the case of line-of-sight propagation and Rayleigh fading for the case of nonline-of-sight propagation, respectively. In addition, in order to improve the security of the system, we also investigate the secrecy performance of the UAV IoT system with a friendly UAV that generates jamming signals to distract the eavesdroppers. Utilizing the stochastic geometry theory, the cumulative distribution functions for the signal-to-interference-plus-noise ratio of the main and eavesdropping links are derived, and then the analytical expressions of the secrecy outage probability and the average secrecy rate are obtained. Finally, the accuracy of the analytical results is verified by Monte Carlo simulation.
With the notable interest in unmanned aerial vehicle (UAV)-to-ground communications, new fading channel models that take into account the effects of shadowing have been proposed for beyond 5G networks. Guaranteeing physical layer security of the UAV-to-ground channels is essential for the transmission of confidential messages in the presence of an eavesdropper. In this paper, we examine physical layer security metrics, such as the average secrecy capacity, the secrecy outage probability, and the probability of strictly positive secrecy capacity, in UAV-to-ground communications with shadowing. Monte Carlo simulations are performed to verify the analytical expressions. Finally, the effect of the fading parameters on the system performance is studied.
Owing to flexible management and low overhead, wireless physical layer security (PLS) has been applied to support many critical applications (e.g., data dissemination) of unmanned aerial vehicles (UAVs)-based mobile communication networks in emergency scenarios. Although the impact of static network scenarios or receiver mobility on PLS has been well studied, there is no much work that studies the impact of UAV-based transmitter mobility on PLS. To fill this gap, in this paper, we investigate PLS of a scenario, where a random mobile UAV-based transmitter transmits information to a static ground entity under Rayleigh fading channel. More specifically, we consider a communication system, in which a mobile UAV hovers over a region to collect information and then disseminates this information to a static ground network entity in a confidential manner under the presence of an eavesdropper. Because of popularity and practicality, the UAV is assumed to hover following the random way point (RWP) mobility model. We investigate the secrecy characteristics of the UAV under steady running state in terms of ergodic secrecy capacity (ESC), positive secrecy capacity probability (PSCP) and secrecy outage probability (SOP) for the communication between the UAV and the receiver. We then investigate the secrecy performance of the proposed system while considering the pause time of the RWP mobility model adopted by the UAV. We further extend our proposed theoretical model to other realistic scenarios, including the presence of multiple cooperative and non-cooperative eavesdroppers, and study the PSCP and SOP metrics of the corresponding system. Furthermore, we propose three types of secrecy improvement strategies for the considered communication model. We strike a good trade-off between the secrecy improvement and transmit outage probability. Extensive simulations have been conducted to validate our theoretical analysis as well as the effectiveness of the proposed secrecy improvement strategies.
In this paper, we study an unmanned aerial vehicle (UAV)-assisted relaying communication system, where a ground base station (GBS) intends to send information to a legitimate ground user (Bob) with the help of a UAV relay, in the presence of a passive ground eavesdropper (Eve). In particular, assuming an urban operating environment, we analyze and derive the closed-form approximation of the intercept probability and the ergodic secrecy rate. Through analytical and numerical results, we examine the effect of different system parameters on secrecy performance.
In this article, we study the secrecy performance of an unmanned aerial vehicle (UAV)-assisted relay communication system, where a ground base station (GBS) intends to send confidential information to the ground legitimate user Bob with the help of a UAV relay in the presence of multiple aerial and ground eavesdroppers. We consider the height-dependent probabilistic line-of-sight and the generalκ-μshadowed channel fading model in the system. To enhance the secrecy performance, the GBS and UAV relay apply directional beamforming transmission while implementing protection zones around their intended receiving destinations. We then derive the approximate closed-form expressions of the secrecy outage probability (SOP) under different aerial and ground eavesdropperscolluding strategies. To get insights, we also obtain the SOP expression over Rayleigh fading as a special case. After discussing the impacts of transmitting and multiple aerial and ground eavesdropping parameters on the SOP, we show that the optimal altitude of UAV relay exists with the minimal SOP value under different urban environments. We also show that UAV eavesdroppers have a larger effect on the system performance than ground eavesdroppers.