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.
Results
Showing 1 to 20 of 26 for “"correlated noise"”.
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Correlated noise effects in spacecraft telemetry arraying
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Synchronization via correlated noise and automatic control in ecological systems
… possibility to synchronize nonlinear systems via correlated noise and automatic control. The thesis is divided into two parts. The first part is motivated by field studies on feral sheep populations on two islands of the St. Kilda archipelago, which revealed strong correlations due to …
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Worst-case identification and complexity under bounded but low correlated noise
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Parametric design of an adaptive line enhancer for multiple switching tones in a correlated noise environment
… data consisting of multiple switching tones in correlated noise. A tradeoff analysis is performed with four methods of digital filtering including a conventional Digital Fourier Transform (DFT) algorithm, a Least Mean Squares (LMS) adaptive algorithm, a Fast Recursive Least Squares (Fast RLS) …
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Maximum likelihood time-domain beamforming using simulated annealing
… beamformer. Broadband signals in spatially correlated noise are treated. Previous time-domain beamformers did not consider the correlation between random noise, and they did not use the concept of maximum likelihood, which is asymptotically optimal. We show that improved resolution can be …
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Characterizing Exoplanet Atmospheres: From Light-curve Observations to Radiative-Transfer Modeling
… spectral bands produce data with low signal-to-noise ratios, a Bayesian approach can robustly reveal what constraints we can set, without over-interpreting the data. Here I performed an end-to-end analysis of transiting exoplanet data. I analyzed space-telescope data for three planets to …
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Multi-Modality Assessment Of Language Function
… In particular, reverse speech and signal-correlated noise are employed and evaluated as control tasks for non-language-specific auditory function. A discrepancy between language-related ECoG and language-related fMRI is discovered in regards to the use of reverse speech as such a control …
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Effects of Non-uniform Gaussian Curvature on the Collective Motion of Active Particles
… XY-model type orientational dynamics with delta-correlated noise, on a variety of curved surfaces. We aim to characterise the different behaviours which emerge and relate particle motion patterns to geodesics and regions of maximum Gaussian Curvature on the surface.
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Noise-Centric Decoding
… a challenging code-specific task. We establish a noise-centric approach for decoding of error correction codes that enables us to introduce a universal ML soft detection decoder called Soft Guessing Random Additive Noise Decoder (SGRAND), which is a development of a previously described hard …
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Scaling up a quantum register of dark electronic spins in diamond
… potential to advance nanoscale sensing, enable correlated noise spectroscopy for error correction, and facilitate the realization of spin-chain quantum wires for quantum communication.
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Data-Driven Decoding of Quantum Surface Codes using Recurrent Neural Networks
… practical use of quantum computers is limited by noise and errors in quantum systems. Quantum Error Correction (QEC) provides a way for detecting and correcting these errors, but in the presence of complex and correlated noise, efficient decoding still remains a significant challenge. In this …
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Probabalistic quantification of intermittently unstable dynamical systems
… unstable mechanical oscillator excited by correlated noise; a complex mode in a turbulent signal with fixed frequency, where nonlinear mode interaction terms are replaced by a stochastic drag and additive white noise forcing; and a stochastic Mathieu equation, featuring intermittent …
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Model-based spectral inference in noisy physical time series: applications in laser linewidth estimation and precision magnetometry
… methods struggle with due to low signal-to- noise ratios, nonstationary dynamics, and convolutional measurement effects. Spectral estimation is crucial in precision metrology, laser diagnostics, and fun- damental physics experiments. Often, the signal of interest isn’t directly observed but …
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Wideband Digital Filter-and-Sum Beamforming with Simultaneous Correction of Dispersive Cable and Antenna Effects
… for array systems that suffer from spatially correlated noise and interference over large bandwidth. The set of finite impulse response (FIR) filter coefficients used to implement the optimum filter-and-sum beamformer are selected to optimize signal-to-noise ratio (SNR) and reduce interference …
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Multiscale Image Analysis for the Automated Localisation of Taxonomic Landmark Points and the Identification of Species of Parasitic Wasp
… while texture analysis techniques introduce correlated noise into the segmented image, which can reduce landmark localisation accuracy to 25%. The wavelet transform overcomes this problem by filtering textural clutter at larger scales of analysis. A novel technique is presented which …
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Transient signal detection using GPS position time series
… position time series because of low signal-to-noise ratios (SNR), correlated noise in space and time and large number of sites in a network. As a systematic detection method, we use state estimation based on Kalman filtering and principal component analysis (PCA). State estimation improves the …
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Behavioural and Neuroimaging Studies of the Influence of Semantic Context on the Perception of Speech in Noise
… in carrot”). Sentences were mixed with signal-correlated noise, at 10 signal-to-noise ratios (-6 to +2 dB and clear speech). Percentage scores were converted to rationalized arcsine units and subjected to a repeated-measures ANOVA; slopes from psychometric functions fitted to the transformed …
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Timing offset and quantization error trade-off in interleaved multi-channel measurements
… to achieve a better signal-to-quantization noise ratio (SQNR) with different quantization granularity in each channel, non-uniform sampling, and appropriate reconstruction filtering. This thesis develops a framework for optimal design of non-uniform sampling constellations to maximize SQNR …
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Probing the atmospheres of transiting exoplanets using ground-based multi-object spectroscopy
… vulnerable to instrumental systematics and correlated noise. In this thesis, I present ground-based observations of three hot Jupiters which I modelled using Gaussian processes, a technique which allows me to robustly disentangle the planetary signals from the systematic noise. In addition, …
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Ground-based transmission spectroscopy of three inflated Hot Jupiter exoplanets
… of exoplanet atmospheres, the importance of correlated noise in the measurements and formulated suggestions on how to improve on the robustness of results in future work.
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