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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...
192

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Updated: Jun 17, 2025

Functional Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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使用KFSC-WRELAX算法的高分辨率多路径延迟测量方法.

Yu Dong1, Zhizhong Zhang1

  • 1School of Electronics & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.

Sensors (Basel, Switzerland)
|August 10, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了KFSC-WRELAX,这是一种用于无线多路通道测量的新算法. 它准确地确定路径延迟,具有强大的性能,克服了当前方法的局限性.

关键词:
卡尔曼过器可以过.这就是WRELAX算法.频道测量 频道测量在m-序列中.滑动相关性 滑动相关性

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科学领域:

  • 电气工程 电气工程
  • 信号处理 信号处理
  • 无线通信无线通信

背景情况:

  • 目前的无线多路径通道测量有较低的准确性,复杂的设备和不良的干扰阻力.
  • 准确的通道表征对于可靠的无线通信系统至关重要.

研究的目的:

  • 引入一个新的算法,KFSC-WRELAX,用于增强无线多路径通道测量.
  • 解决现有方法在准确性,复杂性和抗干扰性方面的局限性.

主要方法:

  • 整合伪随机噪声 (PN) 序列,卡尔曼过 (KF),滑动相关性和加权的里叶变换与RELAXation (WRELAX) 算法相结合.
  • 使用m序列作为检测频道检测的探测序列.
  • 通过模拟实验和现实世界的走廊测试进行验证.

主要成果:

  • 该KFSC-WRELAX算法准确地确定各种多路组件的延迟.
  • 即使在低信号噪声比 (SNR) -5dB或更高的情况下,也证明了强大的性能.
  • 在模拟和实际环境中成功验证.

结论:

  • 与现有的无线通道测量技术相比,KFSC-WRELAX提供了显著的改进.
  • 该算法提供了准确和强大的多路径延迟估计,适合具有挑战性的无线环境.
  • 这种新的方法提高了无线通道表征的可靠性和效率.