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Related Concept Videos

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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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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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Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
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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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Receiver Operating Characteristic Plot01:15

Receiver Operating Characteristic Plot

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A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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On the Performance of Decode-and-Forward Equal-Gain-Combining Relay Systems over Weibull Fading Channels.

Paula Tilleria Lucero1, Henry Carvajal Mora1, Nathaly Orozco Garzón1

  • 1Faculty of Engineering and Applied Sciences (FICA), Telecommunications Engineering, Universidad de Las Américas (UDLA), Quito 170503, Ecuador.

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Summary

This study enhances wireless communication reliability using relay-assisted networks and diversity combining. It analyzes performance metrics like outage probability for millimeter-wave systems, confirming improved signal-to-noise ratio.

Keywords:
Weibull fadingaverage bit error probabilitydecode-and-forwardequal-gain-combiningoutage probability

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Information Theory

Background:

  • Millimeter-wave (mmWave) communication systems face challenges with signal-to-noise ratio (SNR) for mobile terminals.
  • Relay-assisted wireless communication with diversity combining offers a solution to improve SNR.
  • The Weibull distribution is increasingly used to model small-scale fading in mmWave frequencies.

Purpose of the Study:

  • To analyze the performance of a dual-hop decode-and-forward (DF) relaying system with antenna arrays and equal-gain-combining (EGC).
  • To derive exact and asymptotic expressions for outage probability (OP) and average bit error probability (ABEP) in mmWave channels.
  • To investigate the impact of system and fading parameters on the performance of the DF-EGC system.

Main Methods:

  • Utilized a dual-hop decode-and-forward (DF) relaying protocol.
  • Employed antenna arrays at the relay and base station (BS) receivers.
  • Applied equal-gain-combining (EGC) for signal reception.
  • Modeled small-scale fading using the Weibull distribution.
  • Derived closed-form expressions for OP and ABEP.
  • Validated results using Monte Carlo simulations.

Main Results:

  • Derived exact and asymptotic expressions for OP and ABEP in closed form.
  • Demonstrated how system and fading parameters influence the performance of the DF-EGC system.
  • Monte Carlo simulations confirmed the accuracy of the derived expressions.
  • Evaluated the mean achievable rate of the system through simulations.

Conclusions:

  • The derived expressions provide valuable insights into the performance of DF-EGC systems in mmWave frequency bands.
  • The study validates the effectiveness of relay-assisted communication and diversity combining for improving wireless communication reliability.
  • Numerical results offer a deeper understanding of system performance under various parameters.