Abstract
Communication assisted by unmanned aerial vehicles (UAVs) has been regarded as an effective technique for reliability improvement in both military and civilian domains, whereas it also makes the information vulnerable to passive eavesdropping due to its wide broadcast. In this paper, we investigate the secure millimeter wave (mmWave) communication assisted by multiple UAV-enabled relays and jammers, where exist multiple randomly distributed eavesdroppers on the ground. Leveraging the models of 3D-antenna gain and stochastic geometry, new closed-form expressions of secrecy outage probability are derived on the basis of the opportunistic relay selection scheme involving the characteristics of air-to-ground channel, and the secrecy improvement is demonstrated when the relay density increases. In addition, a cooperative jamming scheme, where a part of UAVs transmit the jamming signals, is designed to degrade the qualities of eavesdropping channels and further enhance physical layer security. The simulation results show the impacts of different system parameters on secrecy outage probability and verify our analysis. It's also revealed that there exist the optimal attitude of UAVs, jamming power and density of jammers for achieving the best secrecy performance.
Highlights
With the explosive growth of wireless data traffic, it has been becoming an emergency to develop the high data-rate transmission in wireless communication systems
Taking into account the prevalence of sensitive and confidential information in wireless networks, it’s one of the top priorities to provide a secure service in unmanned aerial vehicles (UAVs)-enabled relaying networks
Analyzing the simulation results, we find that the secrecy outage probability can be improved by adopting higher UAV attitude when the relay density is small, and the result is opposite in large relay density situations
Summary
With the explosive growth of wireless data traffic, it has been becoming an emergency to develop the high data-rate transmission in wireless communication systems. Because of the high path-loss and the sensitivity to blockages, mmWave communication links may be interrupted, especially in a complex and dynamic environment [3], [4] To this end, operating an unmanned aerial vehicle (UAV) as relay in the air has been studied for disconnection recovery and system performance improvement in mmWave communication networks [5]–[7]. As a supplement of conventional cryptographic techniques, physical layer security has emerged as a powerful measure to protect confidential information from wiretapping by exploiting the randomness of wireless channel and its impairments, e.g., noise and interference [9]. If the cooperative jamming can enhance the physical layer security in UAV-enabled mmWave relaying networks and how can we improve it?. Ma et al.: Secure mmWave Communication Using UAV-Enabled Relay and Cooperative Jammer
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