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相关概念视频

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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.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Power Factor Correction01:20

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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相关实验视频

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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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有效的性能增强的CS-NFDM系统采用一般直角循环变换预编码.

Zhihang Sun, Chenglin Bai, Yaozheng Yue

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    本研究介绍了用于连续频谱非线性频率分割多重复合 (CS-NFDM) 系统的通用直角循环变换 (GOCT) 预编码技术. 在GOCT-NFDM系统增强信号与干扰和噪声比率 (SINR) 的分布,提高总体传输性能.

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    相关实验视频

    Last Updated: Feb 21, 2026

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    科学领域:

    • 光学通信是指光学通信.
    • 信号处理 信号处理
    • 信息理论 信息理论

    背景情况:

    • 连续频谱非线性频率分割多重复合 (CS-NFDM) 系统由于符号间干扰 (ISI) 和噪声,导致信号与干扰和噪声比率 (SINR) 分布不均.
    • 这种不统一性不成比例地影响频谱边缘的子载波,降低了整体系统性能.

    研究的目的:

    • 通过解决非均SINR分布,提高CS-NFDM系统的传输性能.
    • 首次在CS-NFDM系统中引入和验证通用直角循环变换 (GOCT) 预编码的应用.

    主要方法:

    • 该研究提出了一个名为GOCT-NFDM的新系统,该系统将GOCT矩阵式的线性预编码应用于每个子载体.
    • 这种预编码将子载波信息分布在整个频谱中,旨在实现统一的SINR分布.
    • 通过对800公里和806公里传输距离进行模拟和实验来验证其有效性.

    主要成果:

    • 与传统的CS-NFDM系统相比,GOCT-NFDM系统在模拟和实验设置中显示出显著的Q因子增长.
    • 模拟结果显示1.67dB (128个子载波,52GHz带宽) 和高达2.05dB (256个子载波,72GHz带宽) 的收益.
    • 实验结果证实了0.56 dB (128个子载波,40 GHz带宽) 和0.74 dB (128个子载波,48 GHz带宽) 的收益.

    结论:

    • 拟议的GOCT预编码有效地使CS-NFDM系统中的SINR分布在非线性频谱中均.
    • 在GOCT-NFDM系统提供了实质性的性能改进与可接受的增加实施复杂性 (O(Nc log Nc)).
    • 该方案为提高高容量光通信系统性能提供了一个可行的解决方案.