Secrecy Analysis of Cooperative Vehicular Relaying Networks over Double-Rayleigh Fading Channels
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Secrecy Analysis of Cooperative Vehicular Relaying Networks over Double‑Rayleigh Fading Channels Anshul Pandey1 · Suneel Yadav1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we investigate physical-layer security performance of the cooperative vehicular relaying networks, wherein the communication from a source vehicle to the destination vehicle is assisted by an amplify-and-forward (AF) relay vehicle in the presence of a passive eavesdropper vehicle. We assume that the communication links between the vehicles experience double-Rayleigh fading. We also consider two AF relaying protocols: (1) fixed gain relaying which requires partial channel state information (CSI), and (2) variable gain relaying which requires full CSI. Specifically, we derive the novel intercept probability and ergodic secrecy capacity expressions for both fixed and variable gain relaying in the presence of double-Rayleigh fading channels. The numerical and simulation results verify our theoretical and analytical findings, and show the impacts of channel conditions and relay and eavesdropper locations on the system secrecy performance. Keywords Physical-layer security · Cooperative vehicular relaying networks · Intercept probability · Ergodic secrecy capacity · Double-Rayleigh fading channels
1 Introduction Rapid proliferation of smart vehicles leveraged with wireless communication capabilities have allowed vehicular networks to support various exciting intelligent transportation system (ITS) applications such as, traffic management, payment services, and infotainment [1–3]. Moreover, coupling vehicular networks with cooperative relaying communications can enhance reliability, efficiency, and coverage of ITS applications and services [4–6]. Such relay assisted vehicular networks can be termed as cooperative vehicular relaying networks (CVRNs). Some traditional relaying protocols such as amplify-and-forward (AF) and decode-and-forward (DF) can be applied in such networks. The AF relaying protocol has attracted significant interest over DF protocol as it is easy to implement and * Suneel Yadav [email protected] Anshul Pandey [email protected] 1
Department of Electronics and Communication Engineering, Indian Institute of Information Technology Allahabad, Prayagraj, Uttar Pradesh 211015, India
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offers shorter latency. Moreover, based on the channel state information (CSI), it can operate under fixed gain relaying or variable gain relaying. In particular, the variable gain AF relaying requires instantaneous CSI, whereas the fixed gain relay needs only statistical CSI. Through vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) modes of communication in CVRNs, information can be disseminated among the vehicles, roadside infrastructures, and users. Despite several advantages, such networks come with their own set of challenges, particularly in the domains of privacy and security [7–9]. Due to the inherent open nature of wireless medium,
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