Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Non-linear phase"”.
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Generalized discrete Fourier transform with non-linear phase : theory and design
… Among these popular transforms, DFT is a linear phase transform and widely used in multicarrier communications due to its performance and fast algorithms. In this thesis, a theoretical framework for Generalized DFT (GDFT) with nonlinear phase exploiting the phase space is developed. It is …
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ATM over an asymmetric digital subscriber line
… the attenuation while bride taps introduce a non-linear phase response. The latter non-linear phase shift is very hard to compensate for. The loop characteristics are incorporated into the simulation, so as to represent different loop structures which exist in the network The overall affect of …
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Radar detection and identification of human signatures using moving platforms
… Furthermore, Fourier-based techniques assume a linear variation in target phase over the aperture, whereas human targets have a highly nonlinear phase history. The resulting phase mismatch causes significant SNR loss in the detector itself. In this work, human target modeling is used to derive a …
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A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations
… study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear Zakharov equations. We vary the simulated wavefield's input spectral properties: directional spreading …
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A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations
… study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear Zakharov equations. We vary the simulated wavefield's input spectral properties: directional spreading …
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Generalized DFT: extensions in communications
… on Discrete Fourier Transform (DFT) from the linear phase to non-linear phase, the proposed GDFT provides many possible carrier sets of various lengths with comparable or better performance than DFT. The availability of the rich library of orthogonal constant amplitude transforms with good …
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Advanced fibre Bragg grating structures: design and application
… designed to compensate simultaneous linear and higher order dispersion. Upon transfer of this technology to our industrial partners, a number of field-trial experiments utilising gratings written using this fabrication technique have been successfully performed. Some of the …
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Range-doppler synthetic aperture radar processing at VHF frequencies
… peak- and integrated side lobe levels and the non-linear phase error in the Fourier domain. An extension to range-Doppler processing, suggested to the candidate by Michael Jin, is demonstrated to provide significantly improved performance over the standard range-Doppler processor for signals …
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Methodologies for remaining useful life estimation with multiple sensors in rotating machinery
… ODM recordings the gear pitting comprises of two phases i) a linear phase, with an almost constant pitting rate and ii) a very short non linear phase where the pitting rate increases exponentially, an explicit indication of a critical failure. Multi-hour gear experiments that are close to real …
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Hydrodynamic and Magnetohydrodynamic Convection in Accretion Disks
… convection in disks. First, we investigate the linear phase of the instability, obtaining estimates of the growth rates both semi-analytically, using one-dimensional spectral computations, as well as analytically, using WKBJ methods. Next we perform three-dimensional, vertically stratified, …
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Advances in Simulating Binary Black Holes
… We would expect this to correspond to a highly non-linear phase of the merger, unlikely to be describable by linear perturbation theory. However, such evidence is based on either a head-on collision of two black holes or a definition of multipole moments that disregards the connection among …
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Design and Implementation of Complexity Reduced Digital Signal Processors for Low Power Biomedical Applications
… the state-of-the-art decimation filters employ linear phase Finite-Impulse-Response (FIR) filters with high orders that in-crease the hardware complexity [1–5]. In this thesis, the novel use of minimum phase Infinite-Impulse-Response (IIR) decimators is proposed where the hardware complexity is …
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Exploring fundamental physics with gravitational waves
In this dissertation I explore several topics in the field of gravitational wave astronomy. By means of introduction, I review the historical evolution of humanity's understanding of the mechanics of gravity, and the events which eventually led to the first ever detection of gravitational waves in …