Three-dimensional placement and transmit power design for UAV covert communications
Document Type
Journal Article
Publication Title
IEEE Transactions on Vehicular Technology
Volume
70
Issue
12
First Page
13424
Last Page
13429
Publisher
IEEE
School
School of Science
RAS ID
40305
Funders
National Natural Science Foundation of China
UNSW Digital Grid Futures Institute
Australian Research Council
Grant Number
ARC Number : DP210102169
Abstract
This work tackles the joint optimization of a unmanned aerial vehicle's (UAV's) three-dimensional (3D) placement and transmit power for covert communications with the objective to maximize the communication covertness subject to a constraint on communication quality. We analytically prove that the optimal horizontal location of the UAV must be on the straight line connecting the legitimate receiver and the warden, while its optimal height is the minimum allowable flying altitude. Subsequently, we derive closed-form expressions to characterize the UAV's optimal 3D location and its optimal transmit power, taking into account the impact of finite blocklength coding. Our numerical results show that the developed optimal design can achieve a better covertness performance compared with an optimal two-dimensional (2D) UAV deployment, especially when the warden is close to the receiver. Besides, we show that, for a given requirement on the communication quality, communication covertness does not always improve as the number of channel uses increases.
DOI
10.1109/TVT.2021.3121298
Access Rights
subscription content
Comments
Zhou, X., Yan, S., Ng, D. W. K., & Schober, R. (2021). Three-dimensional placement and transmit power design for UAV covert communications. IEEE Transactions on Vehicular Technology, 70(12), 13424-13429.
https://doi.org/10.1109/TVT.2021.3121298