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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Nonlinear filter based decision feedback equalizer for optical communication systems.

Xiaoqi Han, Chi-Hao Cheng

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    |April 11, 2014
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    Summary
    This summary is machine-generated.

    A nonlinear filter Decision Feedback Equalizer (DFE) with error detection improves optical communication system performance over linear DFEs. This advanced DFE tackles nonlinear impairments in high-speed optical networks.

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    Area of Science:

    • Optical Communications Engineering
    • Signal Processing

    Background:

    • Nonlinear impairments pose significant challenges in modern optical communication systems.
    • Conventional linear filter-based Decision Feedback Equalizers (DFEs) struggle to mitigate these nonlinear effects effectively.

    Purpose of the Study:

    • To investigate the performance enhancement offered by a nonlinear filter-based DFE.
    • To introduce an error detection capability within the nonlinear DFE for improved robustness.

    Main Methods:

    • Simulated a coherent 100 Gb/sec 16-Quadrature Amplitude Modulation (16-QAM) optical communication system.
    • Employed a nonlinear filter-based DFE architecture with integrated error detection.
    • Compared performance against a conventional linear filter-based DFE in a legacy network setting.

    Main Results:

    • The nonlinear filter DFE demonstrated superior performance compared to the linear filter DFE.
    • The error detection capability contributed to enhanced system reliability.

    Conclusions:

    • Nonlinear filter-based DFEs with error detection are a promising solution for mitigating nonlinear impairments.
    • This approach offers significant advantages for high-speed optical communication systems in existing network infrastructures.