Results 41 to 50 of about 3,627 (192)
IEEE Access, 2021 The rapid growth of multimedia communication systems has expanded the High-Efficiency Video Coding (HEVC) security applications precipitously. Therefore, there is an urgent, elevated need to protect and secure the HEVC content during streaming and ...
Walid El-Shafai +2 more
doaj +1 more source
A recursive scheme for computing autocorrelation functions of decimated complex wavelet subbands [PDF]
, 2010 This paper deals with the problem of the exact computation of the autocorrelation function of a real or complex discrete wavelet subband of a signal, when the autocorrelation function (or Power Spectral Density, PSD) of the signal in the time domain (or ...
Aelterman, Jan +3 more
core +1 more source
Phased array antenna steering using a ring resonator-based optical beam forming network [PDF]
, 2006 A novel beam steering mechanism for a phased array antenna receiver system is introduced. The core of the system is a ring resonator-based integrated optical beam forming network chip.
Borreman, A. +6 more
core +4 more sources
Results in Applied MathematicsThis work deals with the offset fractional Fourier transform (OFrFT), which is a more general version of the fractional Fourier transform (FrFT). We demonstrate the basic properties such as translation, modulation and parity.
Mawardi Bahri +3 more
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Fast and Accurate Refocusing for Moving Ships in SAR Imagery Based on FrFT
Remote Sensing, 2023 Synthetic aperture radar (SAR) is capable of monitoring the ocean all day, regardless of weather conditions. However, moving ships exhibit azimuth defocus in SAR images, which severely hampers ship recognition performance.
Jin Wang +4 more
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Optimal two-stage filtering of elastograms [PDF]
, 2011 In ultrasound elastography, tissue axial strains are obtained through the differentiation of measured axial displacements. However, during the measurement process, the displacement signals are often contaminated with de-correlation noise caused by ...
Georgakis, Apostolos +3 more
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Frequency Domain Adaptive Filters in Vision Transformers for Small‐Scale Datasets
IET Computer Vision, Volume 19, Issue 1, January/December 2025.This paper introduces the Multi‐Head Adaptive Filter Frequency Vision Transformer (MAF‐FViT), a novel Vision Transformer model that replaces self‐attention with frequency‐domain adaptive filtering to improve computational efficiency and feature extraction.
Oscar Ondeng, Peter Akuon, Heywood Ouma
wiley +1 more source
Remote Sensing, 2019 High-frequency surface wave radar (HF SWR) plays an important role in marine stereoscopic monitoring system. Nevertheless, the congestion of external radio frequency interference (RFI) in HF band degrades its performance seriously.
Qing Zhou +5 more
doaj +1 more source
Dual-Domain Transform for Travelling Wave in FRFT Domain [PDF]
ISRN Applied Mathematics, 2011 In wireless communication, the travelling electromagnetic (EM) wave nature of the signal is not reported comprehensively in the literature. To date, the majority of reported work analyzed the nature of the signal propagating through the channel in time and frequency domains only, whereas the travelling EM wave which is actually propagating through the ...
Ashutosh Singh, Rajiv Saxena
openaire +1 more source
Chirp-based multicarrier modulation [PDF]
, 2012 In this paper we demonstrate that in doubly-dispersive environments, a multicarrier (MC) system based on a fractional Fourier transform (FrFT) can achieve a better concentration of power near the main diagonal of the equivalent channel matrix compared to
Solyman, Ahmed +2 more
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