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Maximum Power Transfer01:16

Maximum Power Transfer

278
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.
By substituting the entire circuit with...
278
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

649
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
649
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

159
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...
159
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

131
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.
131
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

240
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.
Spin decoupling is usually achieved by...
240
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

206
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.
The M/EI...
206

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相关实验视频

Updated: Jul 15, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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有效的预编码和功率分配技术,以最大限度地提高光谱效率的光束空间MIMO-NOMA系统.

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
概括

这项研究使用光束空间MIMO-NOMA提高了光谱效率. 拟议的预编码和功率分配的联合优化,与传统方法相比,显著提高了能源效率.

关键词:
在 FP FP FP射线空间 MIMO-NOMA 的光束空间.电力分配权力分配权力分配权预编码 预编码 预编码汇总利率 汇总利率是什么

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相关实验视频

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科学领域:

  • 无线通信是一种无线通信.
  • 信号处理 信号处理
  • 信息理论是信息理论.

背景情况:

  • 频谱效率对于现代无线系统至关重要.
  • 多输入多输出 (MIMO) 和非直角多接入 (NOMA) 是关键技术.
  • 梁空间MIMO-NOMA提供了提高性能的潜力.

研究的目的:

  • 开发和分析一个下行链接光束空间MIMO-NOMA传输方案.
  • 共同优化预编码和功率分配,以提高总比率.
  • 为了提高系统的能源效率.

主要方法:

  • 交替优化算法用于解决非凸问题.
  • 分数编程 (FP) 和诺伊曼序列扩展 (NSE) 用于预编码优化.
  • 开发了一种动态功率分配方案,用于光束内和光束间的优化.

主要成果:

  • 预编码子问题被转换成一个不受约束的优化问题与一个封闭式的解决方案.
  • 使用诺伊曼序列扩展减少了预编码的复杂性.
  • 拟议的光束空间MIMO-NOMA方案显示了比传统方案更高的能源效率.

结论:

  • 预编码和功率分配的联合优化对于光束空间MIMO-NOMA是有效的.
  • 提出的方法成功地解决了非凸的优化挑战.
  • Beamspace MIMO-NOMA提供了一种有希望的方法来提高无线通信的能源效率.