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相关概念视频

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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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...
104
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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Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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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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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.
By substituting the entire circuit with...
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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
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相关实验视频

Updated: Jun 3, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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网络编码增强的极地代码用于中继辅助可见光通信系统.

Congduan Li1,2,3, Mingyang Zhong1,2, Yiqian Zhang1,2

  • 1School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China.

Entropy (Basel, Switzerland)
|January 8, 2025
PubMed
概括

本研究引入了可见光通信 (VLC) 系统的新极性编码方案,显著提高了可靠性并扩大了通信范围. 改进的设计还将吞吐量增加一倍,并将低延迟应用程序的设备成本降低一半.

关键词:
物理层网络编码物理层网络编码极地码是指极地码.可见光通信可见光通信

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相关实验视频

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科学领域:

  • 光学通信是指光学通信.
  • 信息理论 信息理论
  • 无线网络无线网络.

背景情况:

  • 可见光通信 (VLC) 系统具有高带宽潜力,但在可靠性和覆盖范围方面面临挑战.
  • 现有的VLC系统通常需要复杂的中继方案来确保足够的性能.
  • 比特错误率 (BER) 和通信范围是评估VLC系统效率的关键指标.

研究的目的:

  • 为室内VLC系统提出一种新的极性编码方案.
  • 研究极点代码和物理层网络编码 (PNC) 的联合设计,以提高VLC的性能.
  • 为了提高BER,扩大可靠的通信区域,并提高VLC系统的吞吐量.

主要方法:

  • 开发一种专门为VLC环境设计的新型极性编码方案.
  • 基于模拟的评估,针对未编码的传输,对拟议的极性编码方案进行了评估.
  • 探索与物理层网络编码 (PNC) 的极点代码的联合设计.
  • 拟议方案与传统VLC中继系统的比较分析.

主要成果:

  • 拟议的极性编码方案实现了至少5dB的编码增益,显著降低了BER.
  • VLC 系统的可靠通信范围大大扩展.
  • 极码和PNC的联合设计接近于传统VLC中继系统的BER性能.
  • 这种新的方法将系统吞吐量增加一倍,并将设备成本降低一半,同时将每段时间的有效比特率提高一倍.

结论:

  • 拟议的极性编码方案为室内VLC系统提供了显著的进步,提高了可靠性和覆盖范围.
  • 与PNC的联合设计为VLC提供了具有成本效益和高吞吐量的解决方案,特别适用于低延迟应用.
  • 这项研究表明了优化VLC系统性能和扩大其实际应用的有希望的方向.