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相关概念视频

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.
Spin decoupling is usually achieved by...
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Properties of DTFT I01:24

Properties of DTFT I

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In signal processing, Discrete-Time Fourier Transforms (DTFTs) play a critical role in analyzing discrete-time signals in the frequency domain. Various properties of the DTFTs such as linearity, time-shifting, frequency-shifting, time reversal, conjugation, and time scaling help understand and manipulate these signals for different applications.
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
97
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called collision-induced...
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Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

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Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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有助于RIS的合作时间划分多重访问

Hyukmin Son1, Beom Kwon2

  • 1Department of Electronic Engineering, Gachon University, Seongnam 13120, Republic of Korea.

Sensors (Basel, Switzerland)
|January 11, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了可重新配置的智能表面辅助合作时间划分多重访问 (RIS-TDMA),以增强无线通信. 拟议的RIS-TDMA方案通过智能地管理合作传输,确保所有用户的服务质量.

关键词:
这就是"MIMO MIMO".这里是RIS RIS.在TDMA中,TDMA是TDMA.梁成型 梁成型 梁成型 梁成型

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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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科学领域:

  • 无线通信工程 无线通信工程
  • 信号处理 信号处理
  • 信息理论 信息理论

背景情况:

  • 可重新配置的智能表面 (RIS) 通过优化被动元件相位移动,为无线系统提供增强的容量,覆盖范围和能源效率.
  • 时间分割多个接入 (TDMA) 系统与RIS的合作传输是具有挑战性的,因为放大了干扰信号.
  • 现有的研究缺乏关于将RIS与合作TDMA集成的全面研究.

研究的目的:

  • 提出一个新的RIS辅助的合作TDMA计划,以应对干扰挑战.
  • 为了最大限度地提高信号与干扰加噪声比 (SINR) 在合作RIS-TDMA系统的所有用户.
  • 为所有用户保证服务质量 (QoS),同时尽量减少未实现的容量.

主要方法:

  • 开发了一个RIS辅助的合作TDMA框架,利用RIS的机会性部署进行合作传输.
  • 引入了非合作和合作时间段的调度策略.
  • 为合作插槽提出了用户配对机制,并为配对用户设计了传输束成形矢量.

主要成果:

  • 拟议方案有效地保证了所有用户所需的SINR,确保了QoS.
  • 数字和模拟结果验证了RIS辅助合作TDMA的性能改进.
  • 该计划成功地将剩余的所需容量降到最低,这表明有效地利用资源.

结论:

  • 由RIS协助的合作TDMA方案为提高无线通信性能提供了可行的解决方案.
  • 拟议的调度,用户配对和光束成形的方法在管理干扰和改善SINR方面是有效的.
  • 这种方法证明了未来无线网络的巨大潜力,这些网络需要高容量和可靠的QoS.