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相关概念视频

Differential Relays01:20

Differential Relays

145
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...
145
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

87
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:
87
Directional Relays01:25

Directional Relays

125
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...
125
Comparison between RL and RC circuits01:24

Comparison between RL and RC circuits

4.0K
An RC circuit consists of resistance and capacitance, while in an RL circuit, capacitance is replaced by an inductor. RL and RC circuits are first-order differential circuits that store energy. An RC circuit stores energy in the electric field, while an RL circuit stores energy in the magnetic field. When connected to a battery, an RC circuit charges the capacitor, causing the current to decrease from maximum to zero upon being fully charged. This increases the voltage across the capacitor from...
4.0K
Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

280
The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
280
Fast Fourier Transform01:10

Fast Fourier Transform

348
The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
The computational efficiency of the FFT becomes...
348

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相关实验视频

Updated: Jul 11, 2025

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

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基于继电器的秘密通信的性能比较:DF,CF和AF.

Jihwan Moon1

  • 1Department of Mobile Convergence Engineering, Hanbat National University, Daejeon 34158, Republic of Korea.

Sensors (Basel, Switzerland)
|November 14, 2023
PubMed
概括
此摘要是机器生成的。

本研究比较了解码和转发 (DF),压缩和转发 (CF) 和放大和转发 (AF) 继电系统中的秘密通信性能. 在特定功率条件下,CF或AF继电器通常优于DF继电器,从而影响隐蔽速率的优化.

关键词:
放大-然后-向前.压缩并向前进行压缩.隐藏的通信隐藏的通信.解码-然后转发.检测的可能性很低.物理层的安全性是物理层的安全性.继电器 继电器 继电器

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科学领域:

  • 无线通信系统无线通信系统
  • 信息理论是信息理论.
  • 信号处理 信号处理

背景情况:

  • 秘密通信对于安全的数据传输至关重要.
  • 继电器系统提高了通信范围和可靠性.
  • 在保持通信速度的同时优化隐蔽性是一个关键的挑战.

研究的目的:

  • 分析和比较用于秘密通信的解码和转发 (DF),压缩和转发 (CF) 和放大和转发 (AF) 继电系统的性能.
  • 优化公开和隐藏消息之间的功率分配,以最大限度地提高隐藏速率,考虑到继电器的检测错误概率 (DEP).
  • 进行DF,CF和AF系统的延迟感知比较,并检查它们的非对称行为.

主要方法:

  • 在DF,CF和AF中继架构中调查了秘密通信性能.
  • 优化了电力分配,以最大限度地提高隐蔽率,同时最大限度地减少继电器上的DEP.
  • 导出封闭形式的隐蔽率并进行延迟意识的比较.
  • 在各种道模型和非对称条件下分析了系统性能.

主要成果:

  • 压缩和转发 (CF) 或放大和转发 (AF) 继电器在高源传输功率或低继电器传输功率下通常优于解码和转发 (DF) 继电器.
  • 在DF,CF和AF中继的性能层次对系统参数 (如处理延迟,公共消息的服务质量和DEP值) 很敏感,特别是在高中继传输功率下.
  • 数字结果验证了不同道模型的性能比较.

结论:

  • 隐蔽通信的DF,CF和AF中继系统之间的选择主要取决于功率限制和系统参数.
  • 最佳的功率分配策略对于在继电辅助的秘密通信系统中最大限度地提高隐蔽速率至关重要.
  • 进一步的研究可以探索更复杂的中继协议和现实的通道条件,以提高秘密通信安全性.