Abstract
Vehicular communication has been envisioned to support a myriad of essential fifth-generation and beyond use-cases. However, the increasing proliferation of smart and intelligent vehicles has generated a lot of design and infrastructure challenges. Of particular interest are the problems of spectrum scarcity and communication security. Consequently, we considered a cognitive radio-enabled vehicular network framework for accessing additional radio spectrum and exploit physical layer security for secure communications. In particular, we investigated the secrecy performance of a cognitive radio vehicular network, where all the nodes in the network are moving vehicles and the channels between them are modeled as double-Rayleigh fading. Furthermore, adopting an underlay approach, the communication between secondary nodes can be performed by employing two interference constraint strategies at the primary receiver; (1) Strategy I: the secondary transmitter power is constrained by the interference threshold of the primary receiver, and (2) Strategy II: the secondary transmitter power is constrained by both the interference threshold of the primary receiver and the maximum transmit power of the secondary network. Under the considered strategies, we derive the exact secrecy outage probability (SOP) and ergodic secrecy capacity (ESC) expressions over double-Rayleigh fading. Moreover, by analyzing the asymptotic SOP behavior, we show that a full secrecy diversity of 1 can be achieved, when the average channel gain of the main link goes to infinity with a fixed average wiretap channel gain. From the ESC analysis, it is revealed that the ESC follows a scaling law of for large and , where and are the average channel gains of the main link and wiretap link. The numerical and simulation results verify our analytical findings.
Highlights
IntroductionVehicular communications aim at realizing ubiquitous connectivity among the vehicles in a wireless manner [4]
Using the derived exact secrecy outage probability (SOP) expression under Strategy II, we demonstrate the impact of maximum tolerable interference level and maximum secondary transmitter power on the secrecy performance
Whereas this paper considers the double-Rayleigh fading channels, which allows one to operate with less computational resources (because of having cascading degree of order (2) while evaluating the system performance, without the loss of information, and (ii) the work presented in [47] considered the multiple-antennas at the legitimate destination and eavesdropper, which require several parallel radio frequency chains in the front-end architecture of the receiver
Summary
Vehicular communications aim at realizing ubiquitous connectivity among the vehicles in a wireless manner [4] To support such massive connectivity with real-time network access, a substantial amount of energy and radio resources are needed. The cognitive radio-enabled vehicular communications, named cognitive radio vehicular networks (CRVNs), can exploit the additional spectrum opportunities outside the IEEE 802.11p specified standard 5.9-GHz band [7]. Such networks are susceptible to various serious security attacks as the bulk of communication occur over the open and vulnerable wireless medium [8]. Physical-layer security (PHY-security) has arisen as an appealing way to guarantee secure wireless transmissions and to complement the existing security infrastructure further
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