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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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相关实验视频

Updated: Jul 2, 2025

Implementation of a Reference Interferometer for Nanodetection
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Implementation of a Reference Interferometer for Nanodetection

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使用实用的相位转移模型的RIS辅助近场定位.

Saber Hassouna1, Muhammad Ali Jamshed2, Masood Ur-Rehman2

  • 1James Watt School of Engineering, University of Glasgow, Glasgow, UK. s.hassouna.1@research.gla.ac.uk.

Scientific reports
|February 22, 2024
PubMed
概括
此摘要是机器生成的。

本研究研究了使用可重新配置智能表面 (RIS) 的用户设备本地化. 结果表明,现实的振幅模型与统一假设不同,提高了准确性,但在近距离场景中影响了数据速率.

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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
  • 电磁学 电磁学 电磁学 电磁学

背景情况:

  • 用户设备 (UE) 的准确定位对于先进的无线服务至关重要.
  • 可重新配置的智能表面 (RIS) 提供了增强无线通信环境的潜力.
  • 现有的模型往往过于简化了RIS行为,特别是振幅变化.

研究的目的:

  • 分析用户设备本地化性能,使用上链中的基于RIS的镜头.
  • 评估现实的RIS相位依赖幅度变化对定位精度和数据速率的影响.
  • 提出一个简化的本地化算法,以减轻计算复杂性.

主要方法:

  • 对于本地化性能进行费舍尔信息矩阵 (FIM) 分析.
  • 对实际的RIS相位依赖幅度变化的建模.
  • 开发基于角扩展的本地化算法.
  • 位置误差边界 (PEB) 和根平均平方误差 (RMSE) 的近场区域分析.

主要成果:

  • 优越的本地化性能是通过先前的位置信息来实现的.
  • 现实的RIS振幅模型揭示了近场振幅值小于1的局部化误差增加和降低的数据速率.
  • 对于RIS相位移的广泛使用的单位振幅假设被证明是不准确的.

结论:

  • 对RIS振幅变化的现实建模对于准确的近场定位至关重要.
  • 拟议的角扩展算法提供了一个计算效率高的本地化方法.
  • 未来的研究应该考虑这些现实的振幅效应,以优化RIS辅助无线系统.