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Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

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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相关实验视频

Updated: Jun 29, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

对于RIS辅助混合毫米波系统的下链传输的内部光束干扰缓解.

Lou Zhao¹, Yuliang Zhang¹, Minjie Zhang¹

¹School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.

Entropy (Basel, Switzerland)

|March 28, 2024

概括

本研究提出了一种模拟光束成形策略,以减少毫米波 (mmWave) 系统中的干扰. 该方法提高了可重新配置智能表面 (RIS) 辅助混合系统的通信效率.

科学领域:

无线通信系统无线通信系统
信号处理信号处理
电磁学电磁学电磁学电磁学

背景情况:

毫米波 (mmWave) 通信系统使用定向光束成形来克服高路径损失.
毫米波下行链接的一个关键挑战是区分同一光束内的用户,并减轻用户间的干扰.
现有的数字预编码技术在解决这种光束内干扰方面存在局限性.

研究的目的:

为下链传输引入基于模拟光束成形的干扰缓解策略.
为了提高可重新配置的智能表面 (RIS) 辅助混合模拟数字 (HAD) 毫米波系统的性能.
为了实现低分辨率模拟到数字/数字到模拟转换器 (A/Ds) 的高效运行.

主要方法:

对RIS和基站 (BS) 的模拟光束造型器和系数的联合设计.
为可实现的速率性能推导封闭形式的近似表达式.
在大量RIS元素的性能上限的设定.
使用低分辨率的A/D和脉冲振幅调制 (PAM) 信号评估能源效率.

主要成果:

拟议的模拟光束成形策略有效地减轻了毫米波HAD系统中用户间的干扰.
为可实现的速率和性能界限得出了封闭式表达式.

关键词:

模拟光束成型模拟光束成型能源效率是指能效的能源效率.内部光束干扰的干扰.低分辨率的A / Ds.毫米波是一种毫米波.可重新配置的智能表面.

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Implementation of a Reference Interferometer for Nanodetection

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Published on: March 20, 2015

相关实验视频

Last Updated: Jun 29, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies

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该系统证明了低分辨率转换器的高效运行,通过能源效率评估进行了验证.

数字模拟证实了拟议的算法对基准体系的有效性.

结论:

开发的模拟光束成形策略为毫米波下链传输中干扰缓解提供了可行的解决方案.
这种方法对RIS辅助的HAD系统尤其有利,提高了光谱效率,并使低功耗硬件成为可能.
这项工作有助于推进高效和强大的毫米波通信系统.