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Related Concept Videos

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...
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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
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Quasi-light Storage for Optical Data Packets
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Data rate measurement method with selectable range in linear optical sampling.

Qinghua Tian, Shenghua Zhang, Fu Wang

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    Summary
    This summary is machine-generated.

    This study introduces a new range-selectable method for linear optical sampling (LOS) using multi-frequency sampling (MFS). It precisely measures high-speed signal data rates across extended ranges, improving upon existing techniques.

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    Area of Science:

    • Optical engineering
    • Signal processing
    • High-speed communications

    Background:

    • Linear optical sampling (LOS) is crucial for high-speed signal monitoring.
    • Existing multi-frequency sampling (MFS) methods have limited data-rate measurement ranges.
    • Accurate measurement of high-speed signals is challenging due to range limitations.

    Purpose of the Study:

    • To develop a range-selectable data-rate measurement method for LOS.
    • To overcome the limitations of existing MFS techniques for high-speed signals.
    • To enable precise baud-rate measurement independent of modulation format.

    Main Methods:

    • Proposed a novel range-selectable data-rate measurement method based on MFS within LOS.
    • Introduced a discriminant for judging sampling order, crucial for accurate eye diagram plotting.
    • Experimentally validated the method using PDM-QPSK signals from 800 MBaud to 40.8 GBaud.

    Main Results:

    • Achieved precise measurement of baud-rates across selectable ranges.
    • Demonstrated relative error of measured baud-rate less than 0.17%.
    • Attained error vector magnitude (EVM) less than 0.38%.

    Conclusions:

    • The proposed method significantly extends the measurable data-rate range for high-speed signals.
    • It offers selectable measurement ranges and accurate sampling order judgment.
    • This technique holds great potential for advanced high-speed signal monitoring applications.