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 20 of 35 for “"signal parameters"”.
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Isolating Failure Mechanisms in a Fiberglass/Epoxy Tensile Test Specimen Using Acoustic Emission Signal Parameters
<p>This study used acoustic emission (AE) signal parameters to isolate the failure mechanisms in a 0° unidirectional, fiberglass/epoxy tensile test specimen. Since several failure mechanisms were known to be present, the lack of any distinctly identifiable bands in the original amplitude …
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Data-driven Estimation of Low-Power Long-Range Signal Parameters by an Unauthenticated Agent using Software Radio
… to interference from particular chirp-type signals. State-of-the-art signal jamming techniques that exploit this property require the knowledge of two sensitive parameters - Bandwidth (BW) and Spreading Factor (SF). However, such information is available only to authenticated parties on the …
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Air-coupled non-destructive evaluation technology for condition assessment of railroad ties
… domains (f-k domain) to derive parameters indicative of the extent of damage in crossties. A robust “wave front fitting algorithm” is developed to estimate surface wave speed from a B-scan image generated using multiple time domain signals. Five signal parameters, namely surface …
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Algorithms for 3D time-of-flight imaging
… complexity technique based on parametric signal processing for orienting and localizing simple planar scenes. The second is an improved method for simultaneously performing phase unwrapping and denoising for sinusoidal amplitude modulated continuous wave ToF cameras using multiple …
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Studies of structure cracking and fracture strength of E-glass fibres using acoustic emission.
… data including the fracture strength and AE signal parameters can be extracted. Software has been developed for the evaluation of the large number of collected data during a traction test and for the graphical presentation of the AE signal parameters in two and three dimensions. The final …
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Enhancing the bit error rate performance of ultra wideband systems using time-hopping pulse position modulation in multiple access environments
… and BER performance of the transmitted signal are all related to the employed modulation scheme. Several classical modulation schemes can be used to create UWB signals, some are more efficient than others. These schemes are namely, Pulse Position Modulation (PPM), Pulse Amplitude …
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Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems
… Location (PL) algorithms, such as MUltiple SIgnal Classification (MUSIC) and Estimation of Signal Parameters via Rotational Invariance Techniques ESPRIT algorithms. Since using delay of arrival information can improve AOA estimates and classical PL algorithms do not incorporate Delay of …
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Performance Comparison Between Music And Esprit Algorithms For Direction Estimation Of Arrival Signals
… and compares the performance of Multiple Signal Classification (MUSIC) and Estimation of Signal Parameters via Rotational Invariance Techniques (ESPRIT) for the estimation of Direction of Arrival (DOA) of incoming signals to the smart antenna. The comparison of these two algorithms was …
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Mapping multivariate measures of brain response onto stimulus information during emotional face classification
… brain response. Statistically independent model parameters are found to minimize the expectation of an objective likelihood function over time [55], and a novel combination of methods is proposed for separating the signal from the noise. The model’s estimated signal parameters are then …
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Acoustic Modeling and Feature Selection for Speech Recognition
… estimation of LPC coefficients, MUSIC (Multiple Signal Classification) and ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) are used to improve the accuracy of formant estimation. Furthermore, a mixture of nonlinear dynamic systems is developed to improve the …
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Study and development of ultrasound monitoring of skeletal defects
… resolution and quality of the ultrasound signal in comparison to the use of conventional rectangular drive pulse. Sawbone plates mimicking the properties of cortical bone and cancellous bone were used to create limb phantoms with different cut depths. A series of tests were conducted on …
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A study of the detection efficiency of the LIGO interferometers to transient sources
… during the fifth science run. Injected signals serve multiple purposes. Their primary goal is to study the cross-couplings between the gravitational wave channel and the auxilary channels. They also allow us to benchmark the ability of our search method to extract the signal parameters, …
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An analysis of posynomial MOSFET models using genetic algorithms and visualization
… which uses posynomial models of MOSFET parameters, represents one such tool. Genetic algorithms have been used to evolve posynomial models for geometric programs, with a reasonable mean error when modeling MOSFET parameters. By visualizing MOSFET data using two dimensional plots, this …
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Full Brain Blood-Oxygen-Level-Dependent Signal Parameter Estimation Using Particle Filters
… By using a particle filter to optimize the model parameters, the computation time is kept below a minute per voxel without requiring a linearization of the noise in the state variables. The activation results show regions similar to those found in Statistical Parametric Mapping; however, there are …
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Direction of arrival estimation using antenna arrays
… techniques such as the MUSIC (MUltiple Signal Classification) and ESPRIT (Estimation of Signal Parameters via Rotational Invariance) algorithm, and the integrated approaches which combine property restoral-based techniques such as the Iterative Least Squares Projection-based Constant …
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The Steered Auxiliary Beam Canceller for Interference Cancellation in a Phased Array
A common problem encountered in phased array signal processing is how to remove sources of interference from a desired signal. Two existing methods to accomplish this are the Linearly Constrained Minimum Variance (LCMV) beamformer and the Side-Lobe Canceller (SLC). LCMV provides better performance …
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Spectrum Sensing and Blind Automatic Modulation Classification in Real-Time
… paper describes the implementation of a scanning signal detector and automatic modulation classification system. The classification technique is a completely blind method, with no prior knowledge of the signal's center frequency, bandwidth, or symbol rate. An energy detector forms the initial …
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Intelligently Leveraging Multi-Channel Image Processing Neural Networks for Multi-View Co-Channel Signal Detection
… increase in the number of transmitted signals, making RF sensing more complex than ever. Challenges such as signal interference and the lack of prior information about all signal parameters further complicate the task. To address this challenge, researchers have explored machine …
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Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
… these complexities by comparing Barkhausen noise signal characteristics from different ferromagnetic steel grades, all using the same measuring system under reproducible flux-controlled magnetization conditions. This is in contrast to the majority of literature Barkhausen noise investigations, …
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Mitigating timing noise in ADCs through digital post-processing
… the times at which samples of the analog input signal are taken. The error in the sample times, known as jitter, or timing noise, has a non-linear, time-varying and input-dependent effect on the sample values, as opposed to the additive noise usually considered. At present, the error due to …
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