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Covert Communications via Full-Duplex User Relaying.

Jong Yeol Ryu¹, Jung Hoon Lee²

¹Department of AI Information Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea.

Sensors (Basel, Switzerland)

|June 27, 2025

Summary

This summary is machine-generated.

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This study introduces a novel user-relaying scheme for covert communication systems. The method maximizes covert data rates using a full-duplex decode-and-forward relay while maintaining security against eavesdroppers.

Area of Science:

Information Theory
Wireless Communications
Cybersecurity

Background:

Covert communication systems aim to transmit information undetected by eavesdroppers.
Full-duplex relays can enhance communication efficiency but pose security challenges.
Existing schemes often struggle to balance high data rates with guaranteed covertness.

Purpose of the Study:

To develop a user-relaying scheme for covert communication using a full-duplex decode-and-forward relay.
To maximize the covert rate while satisfying strict covertness requirements.
To ensure reliable data transmission for both legitimate users and covert recipients.

Main Methods:

A system model involving a transmitter (Alice), a regular user (Carol), a covert user (Bob), and a warden (Willie).

Keywords:

covert communication covert rate power allocation signal cancellation user relaying

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Employing a full-duplex decode-and-forward relay with successive interference cancellation.

Utilizing phase steering and power allocation for covert data transmission.

Implementing a novel cancellation technique to eliminate covert data at the warden.

Main Results:

The proposed scheme effectively maximizes the covert rate.
Covertness is maintained by keeping the warden's detection probability below a specified threshold.
Perfect cancellation of covert data at the warden is achieved through optimized transmissions.

Conclusions:

The user-relaying scheme significantly enhances covert communication performance.
The integration of full-duplex relaying with advanced signal processing techniques offers a robust solution for secure wireless transmissions.
This approach provides a practical method for achieving high covert rates in the presence of potential eavesdroppers.