Secrecy capacity analysis of bi-static backscatter communication systems

Abstract

The rapid adoption of battery-free internet-of-things (IoT) sensors in multiple environments ranging from agriculture to wildlife surveillance, has seen increased research interest in backscatter communication (BSC) technology. BSC is viewed as a potential technology to enable the further spread of sustainable battery-free IoT applications in environments and scenarios where bulkier-sized battery-powered IoT devices would be unsuitable. In this study, we investigate the secrecy capacity of a bi-static BSC network in the presence of a malicious eavesdropper. The proposed BSC system consists of a reader, multiple backscatter devices, and an eavesdropper. We derive closed-form strictly positive secrecy capacity (SPSC) expressions and ergodic secrecy capacity (ESC) expressions for the BSC reader. Monte Carlo simulations verify the exact capacity expressions.

Secrecy Performance Analysis of Backscatter Communications with Side Information

“…In recent years, several contributions have been carried out to analyze the performance of secure BC systems [25][26][27][28][29][30][31][32][33][34][35][36][37][38] and to evaluate the impact of SI on various communication systems [39][40][41][42][43][44][45]. Saad et al [25] studied the PLS performance of a wireless backscatter systems in terms of the secrecy outage probability (SOP).…”

“…That et al [36] tackled the secrecy capacity of bi-static BC networks, a critical concern in the adoption of battery-free IoT sensors. This study centered on the presence of a malicious eavesdropper and presented closed-form expressions for ASC.…”