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Related Concept Videos

Differential Relays01:20

Differential Relays

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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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Line Protection with Impedance Relays01:27

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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
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Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Overcurrent Relays01:26

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Secure Polar Coding for the Primitive Relay Wiretap Channel.

Manos Athanasakos1, George Karagiannidis2

  • 1Department of Informatics and Telecommunications, National and Kapodistrian University of Athens, 157 72 Athens, Greece.

Entropy (Basel, Switzerland)
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a polar-coding technique for secure wireless relay communications. The method enhances information-theoretic security by enabling relays to intelligently cooperate, achieving both weak and strong secrecy.

Keywords:
decode-and-forwardinformation-theoretic securitypolar codesrelay channelstrong secrecy

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Area of Science:

  • Information Theory
  • Wireless Communications
  • Coding Theory

Background:

  • Wireless networks increasingly rely on cooperation for enhanced security, moving beyond traditional cryptography.
  • Exploiting wireless channel characteristics with error-correcting codes offers a path to information-theoretic security.
  • Relay wiretap channels present unique challenges for maintaining secure communication.

Purpose of the Study:

  • To propose and analyze a polar-coding-based technique for secure communication in primitive relay wiretap channels.
  • To enhance information-theoretic security by enabling intelligent cooperation at the relay.
  • To achieve both weak and strong secrecy through novel encoding schemes.

Main Methods:

  • Integration of a smart cooperation decision mechanism at the relay based on decoding results.
  • Implementation of a decode-and-forward relay mode for cooperative transmissions.
  • Development of a double-chaining construction to ensure strong secrecy and address bit misalignment.

Main Results:

  • The proposed polar-coding scheme is demonstrated to provide information-theoretic security.
  • The intelligent relay cooperation strategy effectively enhances communication security.
  • The double-chaining construction successfully achieves strong secrecy, overcoming prior limitations.

Conclusions:

  • Polar coding offers a viable approach for achieving information-theoretic security in cooperative wireless networks.
  • Intelligent relay cooperation is a powerful tool for enhancing the security of wireless communications.
  • The developed technique provides a robust solution for secure data transmission in relay wiretap channels.