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 14 of 14 for “"ultrawide"”.
-
Adaptive detection in ultrawide bandwidth wireless communication systems
… low-complexity high-efficiency pulse-based ultrawide bandwidth (UWB) systems with reasonable bit-error-rate (BER) performance. The thesis starts with proposing a new pulse-based UWB system, namely the hybrid direct-sequence time-hopping (DS-TH) UWB system. This novel pulse-based UWB system …
-
Suspended stripline filters for ultrawide bandwidth and high RF power
The thesis presents the design, synthesis, and measurement of high peak power ultra-wideband filters in suspended stripline. Ultra-wideband pre-selector filters play a vital role in current electronic warfare systems as they are expected to cover a wide passband and handle high power …
-
Peer-to-peer wireless ultrawide-band localization of fast-moving entities
… without relying on external infrastructure. Ultrawide-band (UWB) radios worn by each node (humans in our case) perform time-of-flight (TOF) measurements between different node pairs, ultimately determining the group topology. The key challenge pertains to the selection of which TOF …
-
Power Electronics Based on Ultrawide Bandgap Semiconductors: from Material Engineering to Device Applications
This work demonstrates high-performance BN/β-Ga2O3 metal-insulator-semiconductor Schottky barrier diodes (MIS SBDs). The BN layer is directly grown on the β-Ga2O3 by pulsed laser deposition (PLD). The presence of a ~2.8 nm BN layer is confirmed by a series of techniques, including X-ray …
-
Error exponents for multipath fading channels : a strong coding theorem
… bandwidth systems over fading channels, such as ultrawide band (UWB) radio and wideband CDMA. We first derive an upper bound for general fading, then specialize to the case of Rayleigh fading where we obtain upper and lower bounds that are exponentially tight and therefore yield the reliability …
-
Microstructural manipulation and architecture design of carbon-based electrochemical systems
… molecules. Additionally, I have demonstrated ultrawide-range electrochemical sensing using substratesupported continuous high-DOS ECNFs. Furthermore, I have examined microwave-assisted controlled oxidation of high-DOS ECNFs for tailoring their electrocapacitive performance. For the second type …
-
Enhancing Stability in Quantum-Dot and Perovskite Optoelectronic Devices through Compositional Engineering and Surface Treatment
… traps and unfavorable band alignment in ultrawide-bandgap perovskite solar cells, a sublayer relevant to triple-junction solar cells. I find that a bifunctional molecule, positioned at a buried interface, simultaneously passivates traps and improves energy alignment, reclaiming ~30 mV of …
-
Deep elastic strain engineering of materials electronic properties by machine learning
… pathways that would reversibly transform an ultrawide-bandgap material such as diamond to a metalized state in an experimentally feasible geometry. The fast and reliable inference of the proposed framework opens a path beyond analyzing and scrutinizing electronic band structures. In …
-
Advancements in Hexagonal Boron Nitride for Thermal Neutron Detection Applications
… improving the material quality of this emerging ultrawide bandgap semiconductor.
-
Design and optimization of chalcogenide waveguides for supercontinuum generation
… be the most promising candidate for generating ultrawide SC in the MIR region.
-
Electro-Thermal Device-Package Co-Design for a High-Temperature Ultra-Wide-Bandgap Gallium-Oxide Power Module
… temperatures. As such, gallium oxide (Ga2O3), an ultrawide-bandgap (UWBG) material with controllable doping and the potential for inexpensive substrates, has presented itself as a potential contender for use in high-temperature power electronics applications. The UWBG of Ga2O3, 4.8 eV compared to …
-
Epitaxial Gallium Oxide Heterojunctions for Vertical Power Rectifiers
… voltages (VBR) at lower on-resistances. However, ultrawide bandgap (UWBG) devices possess greater potential with superior performance limits in comparison to SiC and GaN. Ga2O3 (4.8 eV) is the only UWBG semiconductor with melt-growth capabilities that has already demonstrated research grade wafers …
-
Analysis Of Time Synchronization Errors In High Data Rate Ultrawideban
Emerging Ultra Wideband (UWB) Orthogonal Frequency Division Multiplexing (OFDM) systems hold the promise of delivering wireless data at high speeds, exceeding hundreds of megabits per second over typical distances of 10 meters or less. The purpose of this Thesis is to estimate the timing accuracies …
-
Headtrack: Tracking head orientation using wireless signals
Estimating and tracking the head orientation of the user is an important problem for numerous mobile computing applications. Current solutions to the problem require deploying infrastructure (namely, cameras and lasers) along with expensive (IMU) sensors. These infrastructure-based approaches bound …