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Related Concept Videos

Design Example01:23

Design Example

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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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Linear time-invariant Systems01:23

Linear time-invariant Systems

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A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
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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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Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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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.
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Root Loci for Positive-Feedback Systems01:23

Root Loci for Positive-Feedback Systems

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The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
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Multi-input and Multi-variable systems01:22

Multi-input and Multi-variable systems

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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence...
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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • Chromatic dispersion (CD) and nonlinear distortions degrade performance in double-sideband intensity modulation/direct detection (DSB-IM/DD) systems.
    • Conventional Volterra feed-forward and decision-feedback equalizers (VFFE-VDFE) offer compensation but suffer from high computational complexity, especially with longer memory lengths.

    Purpose of the Study:

    • To propose a novel low-complexity cluster-assisting look-up table-based VDFE (CLUT-VDFE).
    • To significantly reduce the computational complexity of equalizers used in optical transmission systems.

    Main Methods:

    • Implementation of a CLUT-VDFE that eliminates all multiplication operations.
    • Experimental validation using a C-band 100-Gb/s PAM-4 transmission system over 60-km standard single-mode fiber (SSMF).

    Main Results:

    • The CLUT-VDFE achieves equalization performance comparable to conventional VDFE.
    • Elimination of multiplication operations and a significant 48.8% reduction in real-valued additions.

    Conclusions:

    • The proposed CLUT-VDFE effectively compensates for CD and nonlinear distortions.
    • This approach offers a computationally efficient solution for high-speed optical communication systems.