Physical Layer Security of Two-Way Ambient Backscatter Communication Systems

Abstract

Achieving high network traffic demand in limited spectrum resources is a technical challenge for the beyond 5G and 6G communication systems. To this end, ambient backscatter communication (AmBC) is proposed for Internet-of-Things (IoT), because the backscatter device (BD) can realize communication without occupying extra spectrum resources. Moreover, the spectral efficiency can be further improved by using two-way (TW) communication. However, secure communication is a great challenge for accessing massive IoT devices due to the broadcasting nature of wireless propagation environments. In light of this fact, this article proposed a two-way ambient backscatter communication (TW-AmBC) network with an eavesdropper. Specifically, the physical layer security (PLS) is studied through deriving the analytical/asymptotic expressions of the outage probability (OP) and intercept probability (IP). Moreover, the outage probabilities (OPs) in high signal-to-noise ratio (SNR) regions are studied for the asymptotic behavior and the intercept probabilities (IPs) in high main-to-eavesdropping ratio (MER) regions as well. Through analysis and evaluation of simulation performance, the results show that (i) when considering the target node, the OP of the BD decreases with increasing SNR, that is, enhancing the reliability; (ii) an optimal value of BD’s reflection coefficient that maximize the reliability of backscatter link can be obtained; (iii) in high SNR regions, the OPs approach a constant; thus, the diversity orders are zero; (iv) when increasing the MER, the IP of target node decreases, suggesting the security enhances; (v) a trade-off exists between reliability and security which can be optimized by carefully designing the parameters.

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).…”

Backscatter communication-based wireless sensing (BBWS): Performance enhancement and future applications

“…NICScatter could achieve 1.6 bps throughput over a 2 m range. Therefore, deploying low-power physical layer security techniques (ElHalawany et al, 2021;Wang et al, 2022) is direly needed. In ShieldScatter (Luo et al, 2018a), backscatter tags attached to an AP in a multi-antenna-like structure were used to secure IoT devices.…”

Physical Layer Security for Wireless-Powered Ambient Backscatter Cooperative Communication Networks

“…in [9] derived the expressions for the effective capacity of ABcom non-orthogonal multiple access (NOMA) systems. In [10], the asymptotic behaviors of OP and intercept probability (IP) in two-way ABcom networks were studied. A quantitative comparison between ABcom and harvest-then-transmit was performed in [11], illustrating the significant benefits of ABcom in low power consumption.…”