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関連する概念動画

Fast Fourier Transform01:10

Fast Fourier Transform

1.0K
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.
The computational efficiency of the FFT becomes...
1.0K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

1.7K
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...
1.7K
Power Factor Correction01:20

Power Factor Correction

577
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.
577
Maximum Power Transfer01:16

Maximum Power Transfer

976
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.
By substituting the entire circuit with...
976
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

1.1K
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...
1.1K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.9K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.9K

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関連する実験動画

Updated: Feb 21, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

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効果的な性能強化のCS-NFDMシステムは,一般的な正交円流変形をプリコーディング使用しています.

Zhihang Sun, Chenglin Bai, Yaozheng Yue

    Optics express
    |February 20, 2026
    PubMed
    まとめ

    本研究では,連続スペクトルの非線形周波数分割複合 (CS-NFDM) システムのための一般的正交回転変形 (GOCT) プリコーディング技術が紹介されています. GOCT-NFDMシステムは,信号対干渉およびノイズ比 (SINR) の分布を向上させ,全体的な伝送性能を改善します.

    さらに関連する動画

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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    関連する実験動画

    Last Updated: Feb 21, 2026

    Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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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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    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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    科学分野:

    • オプティカル・コミュニケーションズ (OPC)
    • シグナル処理 信号処理
    • 情報理論は情報理論である.

    背景:

    • 連続スペクトルの非線形周波数分割マルチプレキシング (CS-NFDM) システムは,シンボル間干渉 (ISI) とノイズによる非均一な信号対干渉とノイズ比 (SINR) 分配に苦しんでいます.
    • この非均一性は,スペクトル端のサブキャリアに不釣り合いな影響を及ぼし,システム全体のパフォーマンスを低下させます.

    研究 の 目的:

    • CS-NFDMシステムの伝送性能を改善するために,非均一なSINR分布に対処します.
    • CS-NFDMシステムで初めて,一般直角循環変形 (GOCT) のプリコーディングの適用を導入し,検証する.

    主な方法:

    • この研究では,GOCT-NFDMと呼ばれる新しいシステムを提案し,各サブキャリアに対してGOCTマトリックスベースの線形プレコーディングを適用します.
    • この事前コーディングは,サブキャリア情報をスペクトル全体に分散し,SINRの均一な分布を目指します.
    • 効果は,シミュレーションと実験を通じて,それぞれ800kmと806kmの伝送距離で検証されました.

    主要な成果:

    • GOCT-NFDMシステムは,シミュレーションと実験の両方のセットアップで,従来のCS-NFDMシステムと比較して,Qファクターの有意な増加を示しました.
    • シミュレーション結果は1.67dB (128サブキャリア,52GHz帯域幅) と最大2.05dB (256サブキャリア,72GHz帯域幅) の増幅を示した.
    • 実験結果は0.56dB (128サブキャリア,40GHz帯域幅) と0.74dB (128サブキャリア,48GHz帯域幅) の得点を確認した.

    結論:

    • 提案されたGOCTプリコーディングは,CS-NFDMシステムにおける非線形スペクトル全体でのSINR分布を効果的に均等化します.
    • GOCT-NFDMシステムは,実装の複雑さ (O ((Nc log Nc)) の許容可能な増加とともに,実質的なパフォーマンスの改善を提供します.
    • このスキームは,高容量光通信システムのパフォーマンスを向上させるための実行可能なソリューションです.