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Bandpass Sampling01:17

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

Fiber communications using convolutional coding and bandwidth-efficient modulation.

Torsten Wuth, Erik Agrell, Magnus Karlsson

    Optics Express
    |June 9, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Combining convolutional coding with bandwidth-efficient modulation offers significant advantages. This approach improves digital communication performance by nearly 5 dB, even with chromatic dispersion.

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    Quasi-light Storage for Optical Data Packets
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    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    Area of Science:

    • Digital Communications
    • Coding Theory
    • Modulation Techniques

    Background:

    • Convolutional coding and bandwidth-efficient modulation are crucial for reliable digital data transmission.
    • Optimizing modulation formats and line codes is essential for maximizing spectral efficiency and minimizing errors.
    • Understanding the impact of intersymbol interference, such as chromatic dispersion, is vital for system performance.

    Purpose of the Study:

    • To numerically evaluate the benefits of combining convolutional coding with bandwidth-efficient modulation.
    • To compare various multilevel modulation formats, line codes, and decoding strategies.
    • To assess the system's robustness against chromatic dispersion.

    Main Methods:

    • Numerical evaluation of combined coding and modulation schemes.
    • Comparison of different multilevel modulation formats and line codes.
    • Analysis of hard/soft decision decoding techniques.
    • Testing performance under conditions of chromatic dispersion.

    Main Results:

    • An improvement of approximately 5 dB was observed for bit error rates around 10^-8 compared to Differential Phase Shift Keying (DPSK) modulation.
    • The combined coded transmission demonstrated superior performance over uncoded systems.
    • The performance advantage of the coded system was maintained even in the presence of chromatic dispersion.

    Conclusions:

    • Combining convolutional coding with bandwidth-efficient modulation significantly enhances digital communication performance.
    • The proposed scheme offers substantial gains in signal-to-noise ratio, improving reliability.
    • The system exhibits robustness against intersymbol interference, making it suitable for practical optical communication links.