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

Abstract

Low power consumption and high spectrum efficiency as the great challenges for multi-device access to Internet-of-Things (IoT) have put forward stringent requirements on the future intelligent network. Ambient backscatter communication (ABcom) is regarded as a promising technology to cope with the two challenges, where backscatter device (BD) can reflect ambient radio frequency (RF) signals without additional bandwidth. However, minimalist structural design of BD makes ABcom security vulnerable in wireless propagation environments. By virtue of this fact, this paper considers the physical layer security (PLS) of a wireless-powered ambient backscatter cooperative communication network threatened by an eavesdropper, where a BD with nonlinear energy harvesting model cooperates with decode-andforward (DF) relay for secure communication. The PLS performance is investigated by deriving the secrecy outage probability (SOP) and secure energy efficiency (SEE). Specifically, the closed-form and

Relay Selection for Dual-Hop Cooperative Ambient Backscatter Communication Systems

“…The simulation tool is MATLAB. In the simulations, as shown in Figure 2, a two dimensional network topology is assumed where base station (s), the relays, the backscatter device (b), and the destination (d) are located at the coordinates (−1, 0), (0, 0), (0.5, B y ), and (1, 0), respectively [18,29,30]. The fading variances are assigned by adopting a path loss model of the form λ ij = d −β ij where d ij is the distance between the transmitter node i (s, r 1 , • • • , r K , b) and receiver node j (r 1 , • • • , r K , b, d), and β denotes the path loss factor.…”

“…", and "Asy." denote the simulated results, the analytical results and the asymptotic results, respectively, and "React, BL", "Proact, BL", "React, CL", and "Proact, CL" denote the OP of backscatter link for the reactive RSS (21), the OP of backscatter link for the proactive RSS (29), the OP of cellular link for the reactive RSS (25), and the OP of cellular link for the proactive RSS (32), respectively. Additionally, the labels "Con React" and "Con Proact" in these figures stand for the OP of backscatter link for the conventional proactive RSS, i.e., r k * = arg max r k ∈R min{γ sr k , γ r k d }, and conventional reactive RSS, i.e., r k * = arg max…”

“…On the one hand, as mentioned in many references, using relays can provide extra spatial diversity and expand the coverage of wireless communication systems [21,22]. Recently, the relay-based one-way and two-way cooperative AmBC systems were investigated in [23][24][25][26][27][28][29][30], respectively. In particular, the authors in [23] studied the outage probability and throughput of an energy harvesting enabled decode-and-forward (DF) cognitive relay network over Rayleigh fading channels, where AmBC was utilized as secondary communication.…”

“…In [28], a dual-hop cooperative AmBC system was considered, where the AmBC technique was used in the first hop. In [29], the secrecy performance and energy efficiency of a relaybased cooperative AmBC system with passive eavesdroppers were investigated. In [30], the authors evaluated the outage performance of an opportunistic source selection based two-way cooperative AmBC system.…”

Secrecy Analysis and Prediction of Ambient Backscatter NOMA Systems With I/Q Imbalance

“…Sun et al in [6] investigated the security on κ-µ shadowed distribution as far as security outage probability (SOP) and strictly positive security capacity (SPSC). Through deriving the accurate formulas of SOP and secrecy energy efficiency, the authors in [7] analyzed the security problems of backscatter collaborative communication systems threatened by eavesdroppers. The security of multi-relay models were explored from two aspects of outage probability (OP) and intercept probability (IP) [8].…”