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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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Downsampling01:20

Downsampling

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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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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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Clipper Circuit01:18

Clipper Circuit

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Related Experiment Video

Updated: Feb 16, 2026

Quasi-light Storage for Optical Data Packets
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Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise.

Lu Zhang, Xiaodan Pang, Oskars Ozolins

    Optics Express
    |December 17, 2017
    PubMed
    Summary

    A novel digital mobile fronthaul architecture using differential pulse code modulation (DPCM) significantly enhances data transmission efficiency. This DPCM system achieves higher antenna-carrier container capacity and lower error rates compared to traditional methods.

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    Area of Science:

    • Telecommunications Engineering
    • Signal Processing
    • Optical Communications

    Background:

    • Mobile fronthaul networks are critical for 5G deployment.
    • Existing Common Public Radio Interface (CPRI) faces bandwidth limitations.
    • Efficient data compression and transmission are needed for advanced mobile networks.

    Purpose of the Study:

    • To propose and demonstrate a digital mobile fronthaul architecture based on Differential Pulse Code Modulation (DPCM).
    • To improve data compression and reduce quantization noise in mobile fronthaul systems.
    • To evaluate the performance of the DPCM-based fronthaul for various modulation schemes and future mobile standards.

    Main Methods:

    • Implementation of a DPCM encoding process with a linear predictor.
    • Experimental validation using a 20 km, 15-Gbaud/λ Pulse Amplitude Modulation (PAM4) intensity modulation and direct detection system.
    • Testing with various Quadrature Amplitude Modulation (QAM) levels and Universal Filtered Multicarrier (UFMC) signals.

    Main Results:

    • Achieved a prediction gain of 7-8 dB by suppressing quantization noise.
    • Supported 4, 16, 64, and 256 QAM with 3-6 quantization bits at 30.72 MSa/s.
    • Enabled 1024 QAM and 4096 QAM transmission with Error Vector Magnitude (EVM) below 1% and 0.5% using 8-9 quantization bits.
    • Demonstrated increased antenna-carrier (AxC) capacity and reduced EVM compared to CPRI.
    • Successfully transmitted Universal Filtered Multicarrier signals.

    Conclusions:

    • The proposed DPCM-based fronthaul architecture is feasible and offers superior performance over CPRI.
    • The DPCM system effectively supports high-order QAM and advanced waveforms like UFMC.
    • This technology provides a promising solution for future mobile network fronthaul requirements, including 5G and beyond.