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IEEE Wireless Communications Letters

Secure Communications for Multi-Tag Backscatter Systems

Yu Zhang, Feifei Gao, Lisheng Fan, Xianfu Lei, George K. Karagiannidis

Published Apr 4, 2019• 62 citations
Publisher

Abstract

In this letter, we investigate a multi-tag backscatter communication system in the presence of an eavesdropper. In order to strengthen transmission security, the optimal tag is chosen among N tags. We consider a practical backscatter communication scenario, where channel correlation between the forward and backscatter links may exist and we study its impact on the system's security. Specifically, we derive an analytical expression for the secrecy outage probability (SOP). Moreover, in order to gain more insights for the system design, we obtain an asymptotic closed-form expression for the SOP over correlated Rayleigh fading channels. Finally, simulations are performed to validate the theoretical analysis.

DOI
10.1109/lwc.2019.2909199

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This contribution quantifies the achievable physical layer security of wireless transmission over realistic composite fading conditions in the presence of multiple eavesdroppers (Eves). To this end, exact closed-form analytic expressions are derived for the achievable secure outage probability (SOP) and the probability of strictly positive secrecy capacity (SPSC) for the case ofF\mathcal{F}Fcomposite fading channels. The derived expressions are tractable and their validity is justified through comparisons with respective computer simulation results. In addition, they allow for the development of useful theoretical and practical insights on the effect of the presence of numerous eavesdroppers under different multipath fading and shadowing conditions, as these are encountered in realistic wireless communication scenarios.