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“…Thus, U 1 is a decreasing function of P t . Based on the fact that Proof: According to (25), the first-order derivative of η with respect to P t is given by…”
Section: Optimization Of P T For a Given Pair Of N And χmentioning
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“…Thus, U 1 is a decreasing function of P t . Based on the fact that Proof: According to (25), the first-order derivative of η with respect to P t is given by…”
Section: Optimization Of P T For a Given Pair Of N And χmentioning
“…In [24], the optimization of virtual cooperative spectrum sensing for UAV-based interweave CR system is studied. In [25], the UAV is deployed as an aerial base station and provide wireless services to the ground users. The UAV's trajectory, the bandwidth allocation and user communication scheduling are optimized to maximize the EE and satisfy user quality-of-experience (QoE) requirement.…”
Section: Introductionmentioning
“…More details can refer [31]. (10) is the sum of multiple-ratio fractional programming problems, while the non-convexity introduced by the ratio operation can be solved by the recently proposed technique in [32]. Then, (10) can be solved in an AO method.…”
Section: The Joint Bf and Trajectory Design A The Lagrangian Dumentioning
“…In addition, in [9], the authors studied the optimal three dimensional trajectory design and resource allocation for solar-powered UAV communication systems, where a mixed-integer nonconvex optimization problem was proposed, taking into account the aerodynamic power consumption, the solar energy harvesting, the finite energy storage capacity, and the qualityof-service (QoS) requirements of the users. Also, energy efficient UAV communication have been investigated in [10] and [11], where the Dinkebach method was commonly used to transform the fractional programming to a linear optimization, but the computational complexity is high. Recently, in [12], the authors investigated the trajectory and transmit power optimization in secrecy UAV communication network, and was extended in [13] with considering robust design to handle the uncertainty ground user locations.…”
Section: Introductionmentioning
“…However, a UAV's on-board energy is another major problem because of the size and weight limitations of UAV, which severely limits the sustainability and performance of UAV communication systems. Following the first work of Zeng and Zhang [20] on the analytical UAV propulsion energy consumption model, researchers have widely developed a few energyefficient UAV communication schemes to strike an optimal balance between the system throughput and the energy consumption and further prolong the UAV endurance [21][22][23]. Nevertheless, all these works have not considered the security issue for UAV communication, which motivates us to investigate how to jointly provide secrecy enhancement and save UAV's energy.…”
Section: Introductionmentioning