REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Physical layer security of wireless sensor networks over Weibull fading channels

Dejan n. milić

University of Niš, Faculty of Electronic Engineering, Niš, dejan.milic@elfak.ni.ac.rs

Daniela M. Milović

University of Niš, Faculty of Electronic Engineering, Niš, daniela.milovic@elfak.ni.ac.rs

ivica b. marjanović

Republic of Serbia Ministry of Defense, Belgrade, ivica.marjanovic@mod.gov.rs

jelena a. anastasov

University of Niš, Faculty of Electronic Engineering, Niš, jelena.anastasov@elfak.ni.ac.rs

aleksandra M. cvetković

University of Niš, Faculty of Electronic Engineering, Niš, aleksandra.cvetkovic@elfak.ni.ac.rs

Abstract: In this paper, security perspective of wireless sensor networks (WSNs) over Weibull fading environment is analyzed. A number of sensors in WSN communicate with the supervisory node, called sink, in the presence of an eavesdropper. The optimal sensor scheduling scheme is conducted in term to enhance physical layer security. Novel expression for evaluating intercept probability of this scheme is derived and compared with the conventional round-robin scheduling scheme, under non-rigid assumption of identically distributed fading sensor-sink, eavesdropper-sensor links. Relaying on derived theoretical results, the impact of number of active sensors, the fading channel conditions and the impact of various main-wiretap channel gain ratios on the probability of intercept is obtained. The Monte Carlo simulation results are also presented in order to verify analytical results.

Keywords: intercept probability, optimal sensor scheduling scheme, physical layer security, Weibull fading, wireless sensor networks.