Results 11 to 20 of about 2,435,332 (149)

Continuous Time Frequency Domain Analysis of Ф-OTDR Nonstationary Signals

open access: yesJournal of Harbin University of Science and Technology, 2021
Most of the natural vibration signals are stationary and modulated by the interference light signal of the distributed optical fiber vibration sensing system.
XU Tao, LI Li
doaj   +1 more source

Blind Receiver Design for OFDM Systems Over Doubly Selective Channels [PDF]

open access: yes, 2007
We develop blind data detectors for orthogonal frequency-division multiplexing (OFDM) systems over doubly selective channels by exploiting both frequency-domain and time-domain correlations of the received signal. We thus derive two blind data detectors:
Cui, Tao, Tellambura, Chintha
core   +1 more source

Synchronous machine parameter identification in frequency and time domain [PDF]

open access: yesSerbian Journal of Electrical Engineering, 2007
This paper presents the results of a frequency and time-domain identification procedure to estimate the linear parameters of a salient-pole synchronous machine at standstill.
Hasni M.   +5 more
doaj   +1 more source

Nonparametric frequency domain analysis of nonstationary multivariate time series [PDF]

open access: yes, 2002
We analyse the properties of nonparametric spectral estimates when applied to long memory and trending nonstationary multiple time series. We show that they estimate consistently a generalized or pseudo-spectral density matrix at frequencies both close ...
Velasco, Carlos
core   +3 more sources

Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing Approaches

open access: yesEURASIP Journal on Advances in Signal Processing, 2007
Frequency-domain and time-domain processing approaches to direction-of-arrival (DOA) estimation for multiple broadband far field signals using beamspace preprocessing structures are proposed.
Yan Shefeng
doaj   +2 more sources

Frequency-Domain Streak Camera And Tomography For Ultrafast Imaging Of Evolving And Channeled Plasma Accelerator Structures [PDF]

open access: yes, 2010
We demonstrate a prototype Frequency Domain Streak Camera (FDSC) that can capture the picosecond time evolution of the plasma accelerator structure in a single shot. In our prototype Frequency-Domain Streak Camera, a probe pulse propagates obliquely to a
Dong, P.   +5 more
core   +1 more source

High-order, Dispersionless "Fast-Hybrid" Wave Equation Solver. Part I: $\mathcal{O}(1)$ Sampling Cost via Incident-Field Windowing and Recentering [PDF]

open access: yes, 2020
This paper proposes a frequency/time hybrid integral-equation method for the time dependent wave equation in two and three-dimensional spatial domains.
Anderson, Thomas G.   +2 more
core   +2 more sources

Time-Domain and Monostatic-like Frequency-Domain Methods for Bistatic SAR Simulation

open access: yesSensors, 2021
In recent years, an increasing interest has been devoted to bistatic SAR configurations, which can be effectively used to improve system performance and/or to increase the amount of physical information retrievable from the observed scene.
Gerardo Di Martino   +3 more
doaj   +1 more source

Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures

open access: yesJournal of Marine Science and Engineering, 2022
The study of wave-structure interactions involving nonlinear forces would often make use of the popular hybrid frequency–time domain method. In the hybrid method, the frequency-domain analysis could firstly provide the reliable and accurate dynamic ...
Wanan Sheng   +6 more
doaj   +1 more source

A robust and low frequency stable time domain PMCHWT equation [PDF]

open access: yes, 2015
The time domain PMCHWT equation models transient scattering by piecewise homogeneous dielectrics. After discretization, it can be solved using the marching-on-in-time algorithm.
Andriulli, Francesco P   +2 more
core   +3 more sources

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