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 50 for “"Signal acquisition"”.
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Weak GPS Signal Acquisition Using Antenna Diversity
GNSS Acquisition in fading and attenuated environments is challenging. In these situations, additional processing gain is required. A common method is to extend the coherent integration time. However, in weak signal situations, using only long coherent integration is limited by navigation data bit …
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Signal Acquisition and Tracking for a Software Gps Receiver
… Software-based GPS receiver processes the GPS signal at the radio frequency or intermediate frequency depending on the hardware configuration of the receiver. In this development of the acquisition and tracking processes of the software receiver, the front-end device that converts the radio …
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Random observations on random observations: Sparse signal acquisition and processing
In recent years, signal processing has come under mounting pressure to accommodate the increasingly high-dimensional raw data generated by modern sensing systems. Despite extraordinary advances in computational power, processing the signals produced in application areas such as imaging, video, …
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Design and Construction of a Low-Cost, Low-Field MRI System for MR Signal Acquisition
… of a small-scale low-field MRI system for signal acquisition by making use of permanent magnets and locally sourced components. A Halbach cylinder was employed to generate the static magnetic field B0. A parallel genetic algorithm with an island model enabled efficient optimisation, …
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NOVEL APPROACHES TO TESTING GASTRO INTESTINAL FUNCTION IN VITRO: CONTROLLING SIGNAL ACQUISITION, TISSUE COMPOSITION, OR THE PLATFORM
Propulsion in the gut is orchestrated by a rhythmic complex called the neuromuscular apparatus which includes smooth muscle, enteric neurons, and interstitial cells of Cajal (ICC). Depletions of these cell populations are associated with several motility disorders, and their significant effects on …
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Advanced techniques for fast offset cancellation limit amplifiers
… designs, resulting in a 50x improvement in signal acquisition time to 20ns. A novel digital design reduces this acquisition time even further. Results were verified using behavioral and component-level simulators
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Signalakquisition in DS-Spreizspektrum-Systemen und ihre Anwendung auf den 3GPP-FDD-Mobilfunkstandard
Robust signal acquisition is an important task in DS-SS receivers. The objective of the acquisition is to coarsely estimate the signal parameters such that the succeeding parameter tracking algorithms can be initialized. In particular, acquisition is needed to coarsely synchronize the receiver to …
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Structural Wireless Delamination Sensor
… by adding different external resistors, and a signal was acquired wirelessly for each value of Q as the delamination crack propagated. The wirelessly acquired signal was also sampled (sampling frequency Fₛ = 100 MHz) and analyzed to estimate the resonant frequency of the sensor. The effect of …
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The Use of ECG Body Surface Mapping in the Early Stages of Myocardial Infarction
… handle 64 ECG leads. It is portable and allows signal acquisition within 10 minutes, an important feature when working with very ill patients. The ECG map characteristics of 30 normal subjects were analyzed using isopotential and isointegral maps. Variability was studied in some subjects of this …
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Single-sided magnetic resonance sensors for clinical detection of volume status
… question including instrumentation development, signal acquisition studies, and clinical studies. We describe the design of a point-of-care, single-sided magnetic resonance relaxometer. The constructed sensor can acquire slice-selective signal from 8mm above the instrument’s surface with a high …
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Polar frequency discriminators
… role in instantaneous frequency measuring (IFM) signal acquisition receivers. Frequency discriminators are the major building blocks of IFM. They are required to measure frequency accurately over very broad bandwidths and to have near unity probabilities of pulse intercept. The major difficulties …
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Simplifying Multimodal Emotion Recognition with Single Eye Movement Modality
… of electroencephalography (EEG) and eye movement signals is one of the most attractive practices due to their complementarity and objectivity. However, the high cost and inconvenience of EEG signal acquisition severely hamper the popularization of multimodal emotion recognition in practical …
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Design of High-Resolution SAR ADC for Detection of Sub-Cortical Neuron Action Potentials for BMI Applications
… brain-machine interfaces (BMIs) requires neural signal acquisition systems that are capable of resolving both fast, low-amplitude action potentials (APs) and slow, higher-amplitude local field potentials (LFPs) under stringent power and area constraints. This thesis presents the design and …
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An 8 GHz Ultra Wideband Transceiver Testbed
… a non real-time part for data capture and signal acquisition, and a real-time part for data demodulation and signal processing. The overall objective is to demonstrate a testbed that will allow researchers to evaluate different UWB modulation, multiple access, and coding schemes. As …
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Design and applications of cold-cathode X-ray imaging systems
… cold-cathode x-ray sources could allow for new signal acquisition and processing paradigms in the x-ray domain. This includes time-based image acquisition techniques, such as elastography and photon-counting measurements. In this dissertation, I discuss (1) the development of two novel types of …
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Investigation of a Correlation Based Technique for Rapid Phase Synchronization in the DVB-S Standard
… of time required to synchronize the received signal. To enhance the correlator's ability to detect the DVB-S synchronization bytes, a two byte, rather than single byte, known sync word is proposed as a modification to the standard. The motivation behind a longer sync word is to improve the …
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Charge carrier transport and recombination in semiconductors: Insights from statistical analysis and machine learning techniques
… diffusive effects and enabling better signal acquisition. This research contributes to the advancement of optoelectronics by enhancing our understanding of charge carrier dynamics in semiconductor materials. The proposed techniques provide valuable insights into exciton behaviour and …
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RF instrumentation and system design for coherent control of anisotropic hyperfine-coupled electron/nuclear spin qubits
… spin resonance (ESR) spectrometer with digital signal acquisition and processing. The spectrometer enhances and expands past contributions of J. S. Hodges and J. C. Yang, who built a first generation device capable of amplitude modulated control pulses. The new device features improved noise …
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Three dimensional mapping of lingual myoarchitecture
… thesis research, several diffusion weighted MRI signal acquisition and post processing methods were tested, namely diffusion spectrum imaging (DSI), DSI with tractography, q-ball imaging, diffusion tensor imaging (DTI), and ADC and FA mapping. Each imaging method was evaluated in three ways: 1) …
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Near-Infrared Spectroscopy for Brain Computer Interfacing
… environment. A BCI translates physiological signals, typically electrical, detected from the brain to control an output device. A significant problem with current BCIs is the lengthy training periods involved for proficient usage, which can often lead to frustration and anxiety on the part of …
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