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 21 for “"RF system"”.
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An RF system for millimeter wave propagation experiments
This thesis describes a method for designing an RF system for measuring rain-induced attenuation and depolarization at millimeter wavelengths. Path length, dynamic range, and polarization isolation are discussed with respect to their importance to RF system performance. Design considerations for …
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MAC Layer DATA/ACK Handshake in the Hybrid VLC-RF System
The hybrid VLC-RF system utilizes a uni-directional VLC link for downlink and the legacy Wi-Fi link for uplink transmission. However, simply integrating the two links without any modi cation in the MAC layer would cause problems for the MAC layer DATA/ACK handshake. The acknowledgements for VLC …
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Design and theoretical analysis of advanced power based positioning in RF system
… applications. The global navigation satellite systems (GNSS) is widely used. But its accuracy suffers from signal obstruction by buildings, multipath fading, and disruption due to jamming and spoof. Hence, it is required to supplement GPS with inertial sensors and indoor localization schemes …
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The Impact of Antenna and RF System Characteristics on MIMO System Capacity
… Such multiple-input multiple-output (MIMO) systems show promise for dramatic performance gains over their single-antenna counterparts. However, MIMO system performance is influenced by many different factors. Antenna array configuration directly contributes to MIMO system performance. The …
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Compact power conditioning and RF systems for a high power RF source
… Integration, compact power conditioning and RF systems were investigated with a maximum diameter of 15.24 cm. A simulator of a flux compression generator (FCG) was built as a non-destructive test stand to evaluate the power conditioning and RF systems. The FCG simulator approximated the …
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Improving the safety and efficacy of bimodal electric tissue ablation.
… of electrolysis with radiofrequency ablation (RFA) to increase the size of tissue ablations. The cathode of the electrolytic circuit is connected to the radiofrequency (RF) electrode to increase the surrounding tissue hydration. This allows the RFA process to continue for a longer period of …
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Electron beam sizes and lifetimes at MAX II and MAX III
… were used to investigate and improve the performance of MAX III and to evaluate a change in the MAX II vacuum system. MAX II was the first synchrotron light source to install nonevaporable getter (NEG)-coated dipole vacuum chambers. They were installed in order to test the feasibility of the …
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Transmit Precoder Design for Dual-Function Radar-Communication Systems
As radio-frequency (RF) antenna, component and processing capabilities grow, the ability to conduct multiple RF system functions from a common aperture is being realized. Conducting both radar and communications functions from the same system is potentially useful for vehicular, health monitoring, …
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Timber-only Structures & Architecture - Exploring the Potential of Using Salvaged Timber and Wooden Nails
… prototypes were built up and an exhibition was performed. The second phase rethought the design process of the trail. A systematic review of integrated design concepts was conducted. Inspired by the review, a concept of using feedback loops was proposed to reinterpret the design process of the …
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Mode-I Fracture in Bonded Wood: Studies of Adhesive Thermal Stability, and of the Effects of Wood Surface Deactivation
… polyurethane (PUR) and resorcinol-formaldehyde (RF) wood adhesives. Bonded specimens for both adhesives were subjected to prolonged thermal exposure, and fracture testing was subsequently conducted after re-equilibration to standard test conditions. It was found that both PUR and RF suffered a …
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A high aspect-ratio silicon substrate-via technology and applications
… low impedance ground connections. As silicon RFICs strive for high-frequency operation, it becomes increasingly important to reduce all extrinsic parasitics. Of particular concern is the MOSFET source or BJT emitter impedance, which greatly affects the gain of RF amplifiers. To address this, …
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Orthogonally coded array for high-speed synthetic aperture radar (SAR) imaging
… Within the SAR family, many different imaging systems have been designed and developed to optimize the tradeoffs between image quality, resolution, image production speed, and system hardware complexity. For certain imaging applications, in which weakly scattering targets are of interest, image …
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Machine Learning for Data-Driven Signal Separation and Interference Mitigation in Radio-Frequency Communication Systems
… source separation for radio-frequency (RF) systems is a challenging problem relevant to key applications, including wireless communications, radar, and spectrum monitoring. This thesis addresses the challenge by focusing on data-driven approaches for source separation, leveraging …
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Multifunction Radio Frequency System Design Using Nonlinear Models
Multifunction radio frequency (RF) systems provide a general-purpose hardware platform for designers to implement arbitrary waveform transmission and reception. In this thesis, a multifunction RF transceiver is designed, simulated and tested. The transceiver was designed for radar applications …
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Architecture and design of an RF receiver front-end and transmitter for wireless sensor networks, healthcare and smart energy systems
… for ubiquitous wireless communications utilizing RF transceivers which consume the lowest possible energy. The thesis focuses on the architecture, design, implementation and evaluation of an RF transmitter and receiver front-end which are part of the foundations of a commercial RF system on a …
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Development of ultra wideband antenna array for human detection under debris
… is a requirement for efficient search and rescue systems to pull the victims out of the debris. Ground penetrating radar (GPR) plays an important role under in such circumstances to rescue the precious lives. In recent decades, the under-debris victim detection system using Doppler radar technique …
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A Standalone High Frequency Receiver System
The High Frequency Receiver System (HFRS) is a mobile, autonomous, Linux-based RF recording system that is designed to pick up ionosonde sounding signals from 1—10 MHz. Systems are designed for quick deployment and capable of remaining deployed in the field for up to a month. The design motivation …
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Inline disinfestation of canola seeds from red flour beetles using a 50-ohm RF technology
… grains. A pilot-scale 50-ohm radio frequency (RF) heating system was used to disinfest adult red flour beetles (Tribolium castaneum) in bulk canola seeds (Brassica napus L.) of 9 % moisture content (MC) in a tubular applicator with parallel electrodes. The heating characteristics of the bulk …
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Deep in-memory computing
… Especially, energy consumption in memory subsystems dominates such a system's energy efficiency. In addition, the memory access latency is a major bottleneck for overall system throughput. To address these issues in memory-intensive inference applications, this dissertation proposes deep …
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Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources
… laptop computers, and intelligent transportation systems (ITS), the FCC allocated three high-frequency bands for unlicensed operation. Of particular interest is the 5-6 GHz Unlicensed National Information Infrastructure (UNII) band intended to support high-speed WLAN applications. The UNII band is …
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