Secure Vehicular Communications Through Reconfigurable Intelligent Surfaces

Ai, Yun; deFigueiredo, Felipe A. P.; Kong, Long; Cheffena, Michael; Chatzinotas, Symeon; Ottersten, Björn

doi:10.1109/tvt.2021.3088441

Cited by 96 publications

(60 citation statements)

References 11 publications

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“…In (15), ξ e,k is calculated as ξ e,k = hH e,k µ t (µ t ) H he,k . The second term on the right side of ( 13) can be approximately as…”

Section: A Sub-problem For Solving Bf Wmentioning

confidence: 99%

“…[13], especially for the cell-free networks. Nowadays, the physical layer security (PLS) technique has been adopted to deal with the security issue [14], [15]. Interestingly, the RIS has also showed a good performance in improving the system security, through increasing the signal strength of legitimate users and weakening that of illegal users [16].…”

Section: Introductionmentioning

confidence: 99%

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Securing Reconfigurable Intelligent Surface-Aided Cell-Free Networks

Hao¹,

Li²,

Sun³

et al. 2022

Preprint

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In this paper, we investigate the physical layer security in the reconfigurable intelligent surface (RIS)-aided cellfree networks. A maximum weighted sum secrecy rate problem is formulated by jointly optimizing the active beamforming (BF) at the base stations and passive BF at the RISs. To handle this non-trivial problem, we adopt the alternating optimization to decouple the original problem into two sub-ones, which are solved using the semidefinite relaxation and continuous convex approximation theory. To decrease the complexity for obtaining overall channel state information (CSI), we extend the proposed framework to the case that only requires part of the RIS' CSI. This is achieved via deliberately discarding the RIS that has a small contribution to the user's secrecy rate. Based on this, we formulate a mixed integer non-linear programming problem, and the linear conic relaxation is used to obtained the solutions. Finally, the simulation results show that the proposed schemes can obtain a higher secrecy rate than the existing ones.

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“…In (15), ξ e,k is calculated as ξ e,k = hH e,k µ t (µ t ) H he,k . The second term on the right side of ( 13) can be approximately as…”

Section: A Sub-problem For Solving Bf Wmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Securing Reconfigurable Intelligent Surface-Aided Cell-Free Networks

Hao¹,

Li²,

Sun³

et al. 2022

Preprint

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show abstract

“…On the other hand, Ai et al [17] demonstrated the potential of improving secrecy with LIS aid under different scenarios where a passive eavesdropper is attempting to retrieve the transmitted information: a vehicular-to-vehicular and a vehicular-to-infrastructure. Makarfi et al [18] showed how the source power, eavesdropper distance, the number of LIS elements, the source-to-relay distance, and the secrecy threshold affect the secrecy capacity and SOP when the vehicular source uses an LIS as an access point.…”

Section: Related Workmentioning

confidence: 99%

Secrecy Analysis and Error Probability of LIS-Aided Communication Systems under Nakagami-m Fading

Ferreira

Facina

Figueiredo

et al. 2021

Entropy

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Large intelligent surfaces (LIS) are a new trend to achieve higher spectral efficiency and signal-to-noise ratio in mobile communications. For this reason, this paper proposes metrics to analyze the performance of systems with multiple antennas aided by LIS and derive the spectral efficiency, secrecy outage probability, and bit error probability in an environment with Nakagami-m distributed fading. In addition to an eavesdropper, there is a single-antenna user, an array of antennas at the transmitter side and the possibility of a direct link between transmitter and receiver. This study assumes that the LIS performs non-ideal phase cancellation leading to a residual phase error that follows a Von Mises distribution, and shows that the resulting channel can be accurately approximated by a Gamma distributed SNR whose parameters are analytically derived. From these formulas, it is possible to evaluate the effect of the strength of the line-of-sight link by varying the Nakagami parameter, m.

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“…Cascaded fading models were found feasible to characterize the multi-hop non-regenerative amplify-and-forward (AF) relaying with fixed gain, the propagation in the presence of keyholes, the keyhole/pinhole phenomena in MIMO systems, and the reconfigurable intelligent surface (RIS)-aided wireless systems [ 97 – 99 ]. Yang et al [ 97 ] modeled the RIS-aided main link as a multiplication of two Rayleigh distributed random variables.…”

Section: Secrecy Characterizationmentioning

confidence: 99%

An overview of generic tools for information-theoretic secrecy performance analysis over wiretap fading channels

Kong

Lei

et al. 2021

J Wireless Com Network

Self Cite

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Physical layer security (PLS) has been proposed to afford an extra layer of security on top of the conventional cryptographic techniques. Unlike the conventional complexity-based cryptographic techniques at the upper layers, physical layer security exploits the characteristics of wireless channels, e.g., fading, noise, interference, etc., to enhance wireless security. It is proved that secure transmission can benefit from fading channels. Accordingly, numerous researchers have explored what fading can offer for physical layer security, especially the investigation of physical layer security over wiretap fading channels. Therefore, this paper aims at reviewing the existing and ongoing research works on this topic. More specifically, we present a classification of research works in terms of the four categories of fading models: (i) small-scale, (ii) large-scale, (iii) composite, and (iv) cascaded. To elaborate these fading models with a generic and flexible tool, three promising candidates, including the mixture gamma (MG), mixture of Gaussian (MoG), and Fox’s H-function distributions, are comprehensively examined and compared. Their advantages and limitations are further demonstrated via security performance metrics, which are designed as vivid indicators to measure how perfect secrecy is ensured. Two clusters of secrecy metrics, namely (i) secrecy outage probability (SOP), and the lower bound of SOP; and (ii) the probability of nonzero secrecy capacity (PNZ), the intercept probability, average secrecy capacity (ASC), and ergodic secrecy capacity, are displayed and, respectively, deployed in passive and active eavesdropping scenarios. Apart from those, revisiting the secrecy enhancement techniques based on Wyner’s wiretap model, the on-off transmission scheme, jamming approach, antenna selection, and security region are discussed.

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Secure Vehicular Communications Through Reconfigurable Intelligent Surfaces

Cited by 96 publications

References 11 publications

Securing Reconfigurable Intelligent Surface-Aided Cell-Free Networks

Securing Reconfigurable Intelligent Surface-Aided Cell-Free Networks

Secrecy Analysis and Error Probability of LIS-Aided Communication Systems under Nakagami-m Fading

An overview of generic tools for information-theoretic secrecy performance analysis over wiretap fading channels

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