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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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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.

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Summary
This summary is machine-generated.

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.

Keywords:
covert communicationcovert ratepower allocationsignal cancellationuser relaying

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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).
  • 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.