Results 1 to 10 of about 2,678,584 (258)
Analysis of multicarrier frequency diverse array radar over time
IET Signal Processing, 2022 The frequency diverse array (FDA) can provide degrees of freedom in both the range and angle domains by controlling the frequency offset across adjacent elements.
Yingjian Zhao +5 more
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Approximation of Time-Frequency Shift Equivariant Maps by Neural Networks
MathematicsBased on finite-dimensional time-frequency analysis, we study the properties of time-frequency shift equivariant maps that are generally nonlinear. We first establish a one-to-one correspondence between Λ-equivariant maps and certain phase-homogeneous ...
Dae Gwan Lee
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A Time–Frequency Domain Analysis Method for Variable Frequency Hopping Signal
SensorsA variable frequency hopping (VFH) signal is a kind of frequency hopping (FH) signal that varies both in frequency and dwell time. However, in radio surveillance, the existing methods for unidentified signals using VFH cannot be effectively handled.
Zhengzhi Zeng +3 more
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Application of time-frequency spectral analysis methods
Trudy Odesskogo Politehničeskogo Universiteta, 2015 In this article the limited application of the non-stationary signals spectra classical analysis using the Fourier transform is substantiated. It is shown that Fourier transform has benefits at periodic signals analysis and limitations when non ...
Yuriy K. Filipsky +2 more
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Time-Frequency Analysis and PDE's
, 2008 We study the action on modulation spaces of Fourier multipliers with symbols $e^{imu(xi)}$, for real-valued functions $mu$ having unbounded second derivatives. We show that if $mu$ satisfies the usual symbol estimates of order $alphageq2$, or if $mu$ is a positively homogeneous function of degree $alpha$, the corresponding Fourier multiplier is ...
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Time–frequency analysis using spiking neural network
Neuromorphic Computing and EngineeringTime–frequency analysis plays a crucial role in various fields, including signal processing and feature extraction. In this article, we propose an alternative and innovative method for time–frequency analysis using a biologically inspired spiking neural ...
Moshe Bensimon +3 more
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INSTANTANEOUS FREQUENCY ESTIMATION USING A LEAST SQUARES TIME-FREQUENCY METHOD
Electrica, 2004 We present a method for estimating the instantaneous frequency of a signal. This method involves the calculation of a time-frequency energy density of the signal, then obtaining an instantaneous frequency estimation from this joint density.
Mahmut ÖZTÜRK, Aydın AKAN
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Human intracranial high frequency oscillations (HFOs) detected by automatic time-frequency analysis. [PDF]
PLoS ONE, 2014 ObjectivesHigh frequency oscillations (HFOs) have been proposed as a new biomarker for epileptogenic tissue. The exact characteristics of clinically relevant HFOs and their detection are still to be defined.MethodsWe propose a new method for HFO ...
Sergey Burnos +6 more
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Time–frequency analysis of chaotic systems [PDF]
Physica D: Nonlinear Phenomena, 2003 36 pages, 18 ...
Chandre, C, Wiggins, SR, Uzer, T
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Frontiers in Signal ProcessingDuring cardiac arrhythmia, the heart frequency is an important physiological parameter that can be identified by analyzing electrocardiogram (ECG) signals.
Laura Diaz-Maue +6 more
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