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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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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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The Maximum Power Transfer Theorem01:20

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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649
Transmission Line Design Considerations01:23

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
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Efficient Precoding and Power Allocation Techniques for Maximizing Spectral Efficiency in Beamspace MIMO-NOMA

Yongfei Liu1, Lu Si1,2, Yuhuan Wang1,2

  • 1Engineering Research Center of Digital Audio & Video Ministry of Education, Communication University of China, Beijing 100024, China.

Sensors (Basel, Switzerland)
|September 28, 2023
PubMed
Summary
This summary is machine-generated.

This study enhances spectral efficiency using beamspace MIMO-NOMA. The proposed joint optimization of precoding and power allocation significantly improves energy efficiency compared to conventional methods.

Keywords:
FPbeamspace MIMO-NOMApower allocationprecodingsum rate

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Area of Science:

  • Wireless communication
  • Signal processing
  • Information theory

Background:

  • Spectral efficiency is crucial for modern wireless systems.
  • Multiple-Input Multiple-Output (MIMO) and Non-Orthogonal Multiple Access (NOMA) are key technologies.
  • Beamspace MIMO-NOMA offers potential for improved performance.

Purpose of the Study:

  • To develop and analyze a downlink beamspace MIMO-NOMA transmission scheme.
  • To jointly optimize precoding and power allocation for increased sum rate.
  • To improve the energy efficiency of the system.

Main Methods:

  • An alternating optimization algorithm is used to solve the non-convex problem.
  • Fractional programming (FP) and Neumann series expansion (NSE) are employed for precoding optimization.
  • A dynamic power allocation scheme is developed for intra-beam and inter-beam optimization.

Main Results:

  • The precoding subproblem is transformed into an unconstrained optimization problem with a closed-form solution.
  • Precoding complexity is reduced using Neumann series expansion.
  • The proposed beamspace MIMO-NOMA scheme demonstrates significantly higher energy efficiency than conventional schemes.

Conclusions:

  • Joint optimization of precoding and power allocation is effective for beamspace MIMO-NOMA.
  • The proposed methods successfully address the non-convex optimization challenge.
  • Beamspace MIMO-NOMA offers a promising approach for enhancing wireless communication energy efficiency.