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Related Concept Videos

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

Overcurrent Relays

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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.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
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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

Line Protection with Impedance Relays

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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.
Under normal conditions, low load currents keep the measured...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Operational Amplifiers01:17

Operational Amplifiers

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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Exact SER Analysis of Partial-CSI-Based SWIPT OAF Relaying over Rayleigh Fading Channels and Insights from a Generalized Non-SWIPT OAF Approximation.

Sensors (Basel, Switzerland)·2025
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A Secure Spatial Multiplexing Transmission Scheme in MIMO Amplify-and-Forward Wiretap Relaying Systems Using

Kyunbyoung Ko1, Changick Song1

  • 1Department of Electronic Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si 27469, Republic of Korea.

Sensors (Basel, Switzerland)
|February 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new artificial fast fading (AFF) design for secure wireless communication in multi-input multi-output (MIMO) systems. The method enhances physical-layer security without needing eavesdropper channel information.

Keywords:
AFFMIMO AF relayMMSEphysical layer securityspatial multiplexing

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Area of Science:

  • Wireless Communication
  • Information Security
  • Signal Processing

Background:

  • Physical-layer security aims for low probability of interception (LPI) in wireless systems.
  • Existing methods like beamforming and secrecy coding require eavesdropper channel knowledge, limiting practicality against passive eavesdropping.
  • Artificial additive noise and artificial fast fading (AFF) offer LPI without channel state information, with AFF using random precoders to degrade eavesdropper detection.

Purpose of the Study:

  • To propose a novel AFF design for spatial multiplexing multi-input multi-output (MIMO) amplify-and-forward (AF) relay systems.
  • To enhance physical-layer security and low probability of interception (LPI) in wireless communications.
  • To address the challenge of designing AFF schemes without requiring eavesdropper channel information.

Main Methods:

  • Formulation of an optimization problem to minimize Bob's signal mean squared error (MMSE) while ensuring LPI.
  • Application of a convex set approximation technique to handle the non-convex nature of the optimization problem.
  • Derivation of a simple closed-form design for the AFF precoder.

Main Results:

  • A novel closed-form AFF design for MIMO AF relay systems was successfully derived.
  • The proposed design effectively balances the minimization of the legitimate receiver's (Bob) error with the maximization of the eavesdropper's (Eve) detection difficulty.
  • Computer simulations validated the performance gains for both Bob and Eve, demonstrating the effectiveness of the proposed AFF scheme.

Conclusions:

  • The developed AFF design provides an effective solution for enhancing physical-layer security in MIMO AF relay systems.
  • The method achieves low probability of interception (LPI) without requiring knowledge of the eavesdropper's channel.
  • The proposed approach offers a practical and efficient way to improve wireless communication security against eavesdropping.