Covert Communications Over Non-Orthogonal Multiple Overt Channels

Ta, Hien Q.; Ho-Van, Khuong; Costa, Daniel Benevides da; Kim, Sang Wu; Oh, Hoon

doi:10.1109/access.2022.3223357

Cited by 8 publications

(2 citation statements)

References 39 publications

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“…The work in [36] initially focused on the timeless of warden's detection in the binary hypothesis test framework. The work of [37] investigated the optimum strategy of hiding the covert information onto the non-orthogonal multiple access (NOMA) information.…”

Section: Related Workmentioning

confidence: 99%

Covert Rate Study for Full-Duplex D2D Communications Underlaid Cellular Networks

Yang

Shen

et al. 2023

IEEE Internet Things J.

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Device-to-device (D2D) communications underlaid cellular networks have emerged as a promising network architecture to provide extended coverage and high data rate for various Internet of Things (IoT) applications. However, because of the inherent openness and broadcasting nature of wireless communications, such networks face severe risks of data privacy disclosure. This paper investigates the covert communications in such networks for providing enhanced privacy protection. Specifically, this paper explores the critical covert rate performance in a full-duplex D2D communication underlaid cellular network consisting of a base station, a cellular user, a D2D pair with a transmitter and a full-duplex receiver, and a warden, where the D2D receiver can operate over either the full-duplex (FD) mode or the half-duplex (HD) mode. We first derive transmission outage probabilities of cellular and D2D links under the FD and HD modes, respectively. Based on these probabilities, we further provide theoretical modelling for the covert rate under each mode and explore the corresponding covert rate maximization by jointly optimizing the transmit powers of the D2D pair and the cellular user. To improve the covert rate performance, we propose a general mode in which the D2D receiver can flexibly switch between these two modes. Under the general mode, we also investigate the theoretical modelling and maximization problems of covert rate. Finally, we present extensive numerical results to illustrate the covert rate performances under the FD, HD, and general modes.

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Section: Related Workmentioning

confidence: 99%

Covert Rate Study for Full-Duplex D2D Communications Underlaid Cellular Networks

Yang

Shen

et al. 2023

IEEE Internet Things J.

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“…The destination node first decodes the public message by taking the covert message as interference [28], leading to the achievable rate for the public message of…”

Section: Df Relaymentioning

confidence: 99%

Performance Comparison of Relay-Based Covert Communications: DF, CF and AF

Moon

2023

Sensors

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In this paper, we investigate the performance of covert communications in different types of a relay system: decode-and-forward (DF), compress-and-forward (CF) and amplify-and-forward (AF). We consider a source node that attempts to send both public and covert messages to a destination node through a relay on which a covert message detector is embedded. By taking the minimum detection error probability (DEP) at the relay into account, we optimize the power distribution between the public and covert messages to achieve the maximum covert rate. We further make a delay-aware comparison among DF, CF and AF relay systems with the obtained closed-form covert rates and conduct an extensive examination on the asymptotic behaviors in different limits. Our analyses reveal that CF or AF tend to outperform DF for high source transmit power or low relay transmit power, while various system parameters such as the processing delay, minimum required quality of service for public messages and DEP threshold lead to different performance relationships among DF, CF and AF for high relay transmit power. Numerical results verify our investigation into the performance comparison in various channel models.

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Covert communications in a compress-and-forward relay system

Moon

2024

ICT Express

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Covert Communications Over Non-Orthogonal Multiple Overt Channels

Cited by 8 publications

References 39 publications

Covert Rate Study for Full-Duplex D2D Communications Underlaid Cellular Networks

Covert Rate Study for Full-Duplex D2D Communications Underlaid Cellular Networks

Performance Comparison of Relay-Based Covert Communications: DF, CF and AF

Covert communications in a compress-and-forward relay system

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