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 11 of 11 for “"Radio Frequency (RF) Signals"”.
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Capturing the human figure through a wall
We present RF-Capture, a system that captures the human figure - i.e., a coarse skeleton - through a wall. RF-Capture tracks the 3D positions of a person's limbs and body parts even when the person is fully occluded from its sensor, and does so without placing any markers on the subject's body. In …
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Human Mesh Recovery Using Radio Signals
This thesis presents RF-Avatar, a neural network model that can estimate 3D meshes of the human body in the presence of occlusions, baggy clothes, and bad lighting conditions. We leverage that radio frequency (RF) signals in the WiFi range traverse clothes and occlusions and bounce off the human …
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Human activity analysis using radio signals
… and in poor lighting conditions. The model takes radio frequency (RF) signals as input, generates 3D human skeletons as an intermediate representation, and recognizes actions and interactions of multiple people over time, or even generate language descriptions for the event. By translating the …
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RF-Based Indoor Localization Around Corners
… More recent work has considered the use of radio frequency (RF) signals to track people and vehicles around street corners. However, past RF-based proposals rely on a simplistic ray-tracing model that fails in practical indoor scenarios. This thesis introduces CornerRadar, an RF-based method …
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Enabling Contactless Sleep Studies at Home using Wireless Signals
… we propose four systems that leverage radio frequency (RF) signals to remotely and automatically monitor the user's sleep in the user's bedroom. First, we present EZ-Sleep, the first contactless sleep sensor that automatically identifies bed entries and exits, and monitors key insomnia …
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Passive sensing of user behavior and Well-being at home
… the way they normally live. We leverage that radio frequency (RF) signals bounce off people, and carry information about them. This thesis presents systems, algorithms, and machine learning models to analyze the signals in the environment and infer information about people's behavior and …
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A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio
Direct analog-to-digital conversion of multi-GHz radio frequency (RF) signals is the ultimate goal in software radio receiver design but remains a daunting challenge for any technology. This thesis examines the potential of superconducting technology for realizing RF analog-to-digital converters …
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Wideband RF Front End Daughterboard Based on the Motorola RFIC
The goal of software-defined radio (SDR) is to move the processing of radio signals from the analog domain to the digital domain — to use digital microchips instead of analog circuit components. Until faster, higher-precision analog-to-digital (ADCs) and digital-to-analog converters (DACs) become …
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GSM based Communication-Sensor (CommSense) System
Using communication signals for radar applications has been a major area of research in radar engineering. In the recent years, due to the widely available wireless signals, a new area of research called commensal radars has emerged. Commensal radars use available wireless Radio Frequency (RF) …
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Precise Geolocation for Drones, Metaverse Users, and Beyond: Exploring Ranging Techniques Spanning 40 KHz to 400 GHz
… techniques, encompassing a spectrum of signals ranging from low-frequency ultrasound acoustic signals to more intricate high-frequency signals like Wireless Fidelity (Wi-Fi) IEEE 802.11az, 5G New Radio (NR), and 6G. Moreover, another contribution is the conception of a novel timing …
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High-Speed and Power Efficient Integrated Electro-Optic Modulators
… this thesis: one based on the Mach-Zehnder interferometer (MZI) silicon modulator to enhance the bandwidth and the other on the microring resonator (MRR) silicon modulator to support higher order modulation formats. In addition to that, I also present a modulator with new device concept based on …