Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

106
Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
106
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

82
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
82
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

88
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
88
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

120
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
120
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

89
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
89
Aliasing01:18

Aliasing

133
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
133

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A Non-Invasive Simplified Model for Estimating Lower Limb Muscle Forces During Slow Gait in Older Adults and Post-Stroke Individuals.

Biomimetics (Basel, Switzerland)·2026
Same author

[Analysis of a child with Osteo-oto-hepato-enteric syndrome and a literature review].

Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics·2026
Same author

Cross-domain correlation analysis to improve SSVEP signals recognition in brain-computer interfaces.

Biomedical physics & engineering express·2025
Same author

Machine Learning-Assisted Design and Discovery of High-Performance Cyanine-Based Photosensitizers for Integrated Theranostic Applications.

Advanced materials (Deerfield Beach, Fla.)·2025
Same author

Programmable photonic processor for discrete fractional Fourier transform with <i>π</i>/8-order resolution.

Optics express·2025
Same author

Nitrite and microcystins co-exposure triggers PINK1-mediated mitophagy in spermatogonia.

Ecotoxicology and environmental safety·2025

Related Experiment Video

Updated: Jun 27, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.0K

Real-time FPGA prototyping of Doppler frequency shift compensation using DSP-assisted automatic frequency control.

Xinpei Tang, Yan Li, Jingwei Song

    Optics Letters
    |May 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a real-time coherent receiver that uses digital signal processing (DSP)-assisted automatic frequency control (AFC) to counteract Doppler frequency shifts (DFS). This advancement improves receiver sensitivity and minimizes power penalties in optical communication systems.

    More Related Videos

    Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
    11:54

    Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface

    Published on: May 8, 2021

    4.4K
    Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
    09:01

    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

    8.7K

    Related Experiment Videos

    Last Updated: Jun 27, 2025

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.0K
    Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
    11:54

    Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface

    Published on: May 8, 2021

    4.4K
    Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
    09:01

    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

    8.7K

    Area of Science:

    • Optical communications
    • Digital signal processing
    • Coherent optical systems

    Background:

    • Doppler frequency shift (DFS) poses a significant challenge in high-speed optical communication systems, degrading signal quality.
    • Existing methods for DFS compensation may lack the real-time processing capabilities required for advanced optical networks.

    Purpose of the Study:

    • To present a novel real-time coherent receiver design.
    • To demonstrate the effectiveness of digital signal processing (DSP)-assisted automatic frequency control (AFC) in compensating for Doppler frequency shifts (DFS).

    Main Methods:

    • Implementation of a real-time coherent receiver employing DSP-assisted AFC.
    • Testing the system in a field-programmable gate array (FPGA)-based 2.5 Gbaud Quadrature Phase Shift Keying (QPSK) coherent optical system.
    • Evaluation of DFS compensation range and frequency shifting rate.

    Main Results:

    • Achieved a DFS compensation range of ±8 GHz and a frequency shifting rate of 33 MHz/s.
    • Demonstrated a receiver sensitivity of -47 dBm at a bit error rate (BER) of 2E-4.
    • The power penalty induced by DFS compensation was found to be less than 1 dB.

    Conclusions:

    • The proposed DSP-assisted AFC scheme effectively compensates for DFS in real-time coherent optical systems.
    • The system exhibits excellent sensitivity and minimal power penalty, making it suitable for high-performance optical communication.
    • This approach offers a robust solution for mitigating DFS impairments in advanced optical networks.