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 19 of 19 for “"Phase offset"”.
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An integer-N charge-pump phase-locked loop with controllable phase offset
In a phase-locked loop (PLL), the phase-offset is a result from non-idealities that usually need to be minimized to reduce the reference spurs at the output. However, in certain applications such as multi-buses, we would like to control this offset so we can align the clock with the data. This …
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FEASIBILITY OF USING EXPERIMENTAL LOAD MEASUREMENTS ON A CYLINDER TO PERFORM PHASE-SENSITIVITY ANALYSIS IN THREE-DIMENSIONAL FLOWS
… three-dimensional vortical wakes when performing phase reduction analysis by using experimental direct load measurements on a cylinder. The outcome of this study is the validation of a method to use load measurements on a cylinder due to wake shedding to measure phase offset jumps and generate …
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Efficient Radiometric Signature Methods for Cognitive Radio Devices
… of the radio, including the frequency offset, modulated phase offset, in-phase/quadrature-phase offset from the origin, and magnitude. Our method provides stable and robust identification by developing individual identifiers (classifiers) that may each be weak (i.e., incurring a high …
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It’s Not Just a Phase: Real-Time Aeroelastic Flutter Control Optical Flow Sensing and Piezoelectric Control of Aeroelastic Flutter
… optical flow as the sole sensing modality, with phase-locked piezoelectric control, inspired by active damping and noise-canceling techniques. A flexible wing model constructed of 0.5 mm thick PETG was outfitted with two macrofiber composite (MFC) piezoelectric actuators mounted in a back-to-back …
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Brushless doubly-fed reluctance machine drive for turbo-electric distributed propulsion systems
… saturation, even at low current-density, that offsets all the benefits. This thesis proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. …
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Effect of Kinematics and Caudal Fin Properties on Performance of a Freely-Swimming Fin
… Numerically, we investigated the effect of phase offset between heave and pitch motion on the performance of a freely swimming fin and compared that to a tethered fin. A freely-swimming fin self propels and moves with steady speed while a tethered fin remains stationary and actuates under …
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Advances in Magnetic Resonance Phase‐Contrast Velocity Mapping
Phase-contrast MRI is used to assess functional flow parameters of the cardiovascular system. Long scan times of three-dimensional flow encoded MRI in particular have, however, hampered the acceptance of the method in a clinical routine setting. Furthermore, concerns have recently been raised about …
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Trellis-based iterative decoding of block codes for satellite ATM
… proposed. As well, we investigate the effect of phase offset on the shortened RM-turbo code performance with Quadrature Phase Shift Keying (QPSK) modulation scheme and the effect of preamble size used to recover carrier phase due to the problem of synchronization which is usually raised in …
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Design and Control of a Cable-Driven Articulated Modular Snake Robot
… and a closed-form approximation for the optimal phase offset between joints to maximize the speed of a snake is obtained by simplifying a previous result. A simplified model of serpentine locomotion that considers the forces acting on a single link as it traverses a sinusoid is presented and …
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Blind Synchronization and Detection of Nyquist Pulse Shaped QAM Signals
… factor of the filter, the optimal sample phase, the frequency offset, the phase offset and as well as the correction of frequency and phase offsets. The blind receiver is proposed for the cognitive radio applications. Cognitive radios are intelligent devices which can adapt themselves …
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Peak-ratio analysis method for enhancement of LOM protection using M class PMUs
… reported in the literature: standard ROCOF, Phase Offset Relay (POR) and Phase Angle Difference (PAD) methods. It is shown that the PRAM technique exhibits comparable performance to the others, and in many cases improves upon their abilities; in particular for systems where the inertia of the …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
… signal and blocker modulation format, and (4) phase-synchronized/non-synchronized blocker reception. The work focuses on M-PSK modulation schemes. For high blocker powers and non-linearity, the Es/No (Eb/No) performance loss can be as high as 4.7 dB for BPSK modulated signal and BPSK modulated …
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A novel maximal-length sequence synchronisation network
… function with its maximum value at no code-phase offset. This allows for multiple access to a single resource and the suppression of multi-path interference as adjacent codes have little effect on each other. This same property requires that the receiver must accurately align its replica of …
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Radio frequency ranging for wireless sensor network localization
… with ranging is used to obtain sub-clock TOF phase offset measurement in order to achieve high resolution TOF measurements. Performance results have been obtained for the line-of-sight (LOS), non-line-of-sight (NLOS) and indoor conditions. Accuracy is typically better than 7.0m RMS for the LOS …
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Analysis of Multiple Degree-of-freedom Oscillatory Aquatic Propulsion
… fin ($A$), heave-to-pitch ratio ($h^*$), and phase offset between the two degrees-of-freedom ($\phi$) was used to explore a parameter space that encompasses and extends beyond the known biological domain. It was found that the shape of phase-averaged propulsive performance curves %($\etaQP$, …
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Flexible Fabrication of Multi-scale Integrated 3D Periodic Nanostructures with Phase Mask
… diffracted-beam control during the fabrication. Phase masks, as one particular kind of DOE, are a promising direction for simple and rapid fabrication of 3D periodic nanostructures by means of Fresnel diffraction interference lithography. When incident with a coherent beam of light, a suitable …
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Phasing of Ground-based Optical Arrays for Space Applications
… of coherent combination is matching the phase of the light from all elements in the optical array in the presence of phase disturbances from several sources. Changes in temperature in optical fibers and in opto-mechanical systems cause slow phase drifts, while mechanical and acoustic …
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DOCSIS 3.1 cable modem and upstream channel simulation in MATLAB
… which is used to perform fine timing and power offset corrections; and “probing” mode, which is presumably used for estimating the frequency response of the channel, but also is used to further correct the timing and power offsets. The MATLAB model is also capable of simulating the channel …
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Ecosystem impacts of variable recruitment in Antarctic krill investigated with long-term monitoring and archived ADCP backscatter data
… in marine phytoplankton productivity, leading to phase-offset five-year cycling in the size of the krill population. We demonstrate that the rate of change of the Adélie breeding population also shows five-year cycling. We link this population response to cyclical krill scarcity, a phenomenon …