Abstract
Unmanned aerial vehicle (UAV)-enabled mobile relaying technique is a promising approach in providing high data rate transmission. Limitations of the UAV's hardware and the line-of-sight link of the air-to-ground channel make UAV ground communication more vulnerable to wiretap and spoof threats. This paper tackles the secure transmission problem with physical layer security (PLS) technologies. A four-node wiretap channel with UAV-enabled relay is considered and eavesdroppers' location information is partially known that they are in a certain area with variable densities. We put forward the secrecy rate maximization problem aiming at optimizing the source/relay transmission power. The objective function and constraints are proved to be non-convex and we convert the non-convex problem to a convex one by introducing the difference-of-concave (DC) programming and slack variables. For a special case, a closed-form solution is obtained which greatly reduces the complexity of the algorithm. The simulation result shows that with the proposed algorithm, the system with partial eavesdroppers' location information can achieve a pretty good secrecy performance close to that in the case with perfect location information.
Highlights
Unmanned aerial vehicle (UAV) is being increasingly utilized in a wide range of areas such as wireless communications [1]–[6], news and television, logistics, distribution, agricultural and forest, because it has become a prominent choice for dangerous and repetitive missions
In this paper, we study a new unmanned aerial vehicle (UAV)-enabled mobile relaying system where eavesdroppers are distributed in an area and only the probability of distribution within the area is known
An iterative algorithm is employed to cope with the intractable problem with non-integrable expression
Summary
Unmanned aerial vehicle (UAV) is being increasingly utilized in a wide range of areas such as wireless communications [1]–[6], news and television, logistics, distribution, agricultural and forest, because it has become a prominent choice for dangerous and repetitive missions. A new application of UAV is studied, termed mobile relaying, where the relay modules are mounted on UAVs. The UAV-enabled mobile relaying may effectively extend communication capability to disaster-affected people (in where partial or complete infrastructure is damaged due to natural disasters) by quickly constructing a communication relay system. The line-of-sight (LoS) [10] and air-to-ground channels between UAVs and ground lead to some new challenges in UAV-enabled relaying systems. Due to the limitations of the UAV’s hardware, the UAV-enabled relaying system lacks encryption and other protective mechanisms [11], [12], the exchanged UAV information in the open and shared nature of wireless medium can be intercepted by ground eavesdroppers
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Published Version
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