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Related Concept Videos

Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Parallel RLC Circuits01:14

Parallel RLC Circuits

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Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
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RLC Series Circuits: Introduction01:25

RLC Series Circuits: Introduction

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Consider an RLC series circuit consisting of a resistor, an inductor, and a capacitor connected to an AC voltage source. A current, which varies sinusoidally over time, flows through the circuit, and this can be expressed by the following equation:  
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RLC Series Circuit: Problem-Solving01:30

RLC Series Circuit: Problem-Solving

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Consider an AC generator with a frequency of 50 hertz and a voltage of 120 volts. The AC generator is connected to an RLC series circuit with a 20-ohms resistor, a 0.2-henry inductor, and a 0.05-farad capacitor. Determine the impedance, current amplitude, and phase difference between the generator's current and emf.
To solve the problem, first, determine the known and unknown quantities in the problem. Recalling the reactance equation for the inductor and capacitor and substituting the...
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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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PHY, MAC, and RLC Layer Based Estimation of Optimal Cyclic Prefix Length.

Adriana Lipovac1, Vlatko Lipovac1, Borivoj Modlic2

  • 1Department of Electrical Engineering and Computing, University of Dubrovnik, 20000 Dubrovnik, Croatia.

Sensors (Basel, Switzerland)
|July 24, 2021
PubMed
Summary

The standard Cyclic Prefix (CP) length in wireless communications is often too long. Optimizing CP length based on channel conditions can significantly improve net throughput.

Keywords:
OFDMcyclic prefixoptimal length

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Telecommunications Engineering

Background:

  • The standard Cyclic Prefix (CP) length in Long Term Evolution (LTE) is oversized for many environments.
  • 5G New Radio (NR) scalable CP length reduction maintains relative overhead.
  • Existing optimization methods focus solely on physical layer (PHY) performance.

Purpose of the Study:

  • To develop a cross-layer analytical model for optimizing Cyclic Prefix (CP) length.
  • To derive a closed-form expression for the optimal CP length.
  • To minimize effective average codeblock length considering retransmissions.

Main Methods:

  • Developed a novel cross-layer analytical model.
  • Derived a closed-form expression for optimal CP length.
  • Incorporated Medium Access Control (MAC) and Radio Link Control (RLC) retransmissions.

Main Results:

  • Optimal CP length minimizes effective average codeblock length.
  • Optimal CP length depends on channel's root mean square (rms) delay spread.
  • Derived optimal CP lengths are significantly lower than industry standards.

Conclusions:

  • Current CP lengths offer potential for throughput improvement.
  • Adaptive CP length optimization is crucial for enhanced wireless performance.
  • Cross-layer analysis provides a more accurate approach to CP length optimization.