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相关概念视频

Downsampling01:20

Downsampling

141
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
141
Power Factor Correction01:20

Power Factor Correction

162
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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Pulse amplitude and quality01:17

Pulse amplitude and quality

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Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
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Upsampling01:22

Upsampling

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
216
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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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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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

85
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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Updated: Jun 16, 2025

Quasi-light Storage for Optical Data Packets
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在连贯的PON中,数字预等级用于性能改进.

Zepeng Gong, Fan Shi, Qingyu He

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    此摘要是机器生成的。

    本研究介绍了200 Gb/s连贯被动光学网络 (PON) 的预等级方案. 该技术提高了接收器的灵敏度和功率预算,这对于下一代光接入网络至关重要.

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    相关实验视频

    Last Updated: Jun 16, 2025

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    科学领域:

    • 光学通信网络是指光学通信网络.
    • 对于光学网络的信号处理.

    背景情况:

    • 高速光学接入网络需要在光学网络单元 (ONU) 降低计算复杂性.
    • 一致的被动光学网络 (PON) 面临着在ONU的计算负载管理方面的挑战.

    研究的目的:

    • 为 200 Gb/s 的连贯 PON 提出一个新的预等级方案.
    • 为了减少在ONU方面计算的复杂性.
    • 为了提高接收器的灵敏度和功率预算.

    主要方法:

    • 数字预扭曲 (DPD) 和预强调技术的整合.
    • 对三种调制格式的评估:50个Gbaud PM-QPSK,50个Gbaud Alamouti编码的PM-16QAM和25个Gbaud PM-16QAM.
    • 使用内定或异定检测方案.
    • 综合的数值模拟和实验评估.

    主要成果:

    • 在接收器灵敏度和200 Gb / s连贯PON的电力预算方面取得了显著的改进.
    • 实现了3dB (PM-QPSK),7dB (Alamouti编码的PM-16QAM) 和2.1dB (PM-16QAM) 的功率预算改进,使用最小的数字过 taps.
    • 验证了预等价计划的有效性.

    结论:

    • 拟议的预等级方案有效地提高了200 Gb/s连贯PON的性能.
    • 该技术为减少ONU的计算复杂性提供了一个可行的解决方案.
    • 这种方法对下一代光学接入网络充满希望.