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 32 for “"Non-Line-of-Sight (NLOS)"”.
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Non-line-of-sight imaging using data-driven approaches
Non-line-of-sight (NLOS) imaging is desirable for its many potential applications such as detecting a vehicle occluded by a building's corner or imaging through fog. Traditional NLOS imaging techniques solve an inverse problem and are limited by computational complexity and forward model accuracy. …
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Spatial Coherency Estimation with a Synthetic Array
… many mobile applications rely on the location of User Equipment (UE) with a built-in wireless receiver and complementary sensors. The performance of wireless localization algorithms depends on the existence of Line-of-Sight (LOS) propagation conditions. However, the existence of …
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High-Speed Simulator for Millimeter-Wave Synthetic Aperture Radar
… interest in using millimeter-wave signals for non-line-of-sight (NLOS) perception tasks, with applications in robotics, augmented reality, and smart-homes. However, existing systems suffer from a lack of large mmWave datasets, resulting in limited accuracy and generalizability compared to their …
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Collaborative Position Location for Wireless Networks in Harsh Environments
Position location has become one of the more important tasks for improving communication and networking performance for future commercial wireless systems. It is also the enabling technology for many control and sensing applications envisioned by the wireless sensor networks (WSN). Despite its …
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Non-line-of-sight imaging using multi-bounce light
Non-line-of-sight (NLOS) imaging techniques produce images from light that has travelled from the scene of interest to the observer via indirect paths which typically include multiple reflections. Such techniques can be particularly useful when the direct line of sight between the observer and the …
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Theory of phasor-field imaging
… is a promising recent solution to the task of non-line-of-sight (NLoS) imaging, colloquially referred to as "seeing around corners". It consists of treating the oscillating envelope of amplitude-modulated, spatially-incoherent light as if it were itself an optical wave, akin to the …
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VT-STAR design and implementation of a test bed for differential space-time block coding and MIMO channel measurements
… wireless communications require transmission of reliable high data rate services. Second generation wireless communications systems use single-input multiple-output (SIMO) channel in the reverse link, meaning one transmit antenna at the user terminal and multiple receive antennas at the base …
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Characterizing and Improving the Non-Collaborative and Collaborative Localization Problems
… thesis focuses on the least-squares formulation of the non-collaborative and collabo- rative position location problems. For the non-collaborative problem, characterization encompassing the number of minima and the causes thereof is provided. Based on these efforts, we propose an improvement to …
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Learning-based Methods for Occluder-aided Non-Line-of-Sight Imaging
Imaging scenes that are not in our direct line-of-sight, referred to as non-line-of-sight (NLOS) imaging, has recently gained considerable attention from the computational imaging community. With a diverse set of potential applications in several domains, NLOS imaging is an emerging topic with many …
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A Coverage Area Estimation Model for Interference-Limited Non-Line-of-Sight Point-to-Multipoint Fixed Broadband Wireless Communication Systems
First-generation, line-of-sight (LOS) fixed broadband wireless access techniques have been around for several years. However, services based on this technology have been limited in scope to service areas where transceivers can communicate with their base stations, unimpeded by trees, buildings and …
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Real-Time Non-Line-of-Sight Imaging Using Single-Photon LiDAR
… settings remains a significant challenge. Non-Line-of-Sight (NLOS) sensing allows for imaging systems to “see around corners", expanding their range of perception, providing access information for realtime decision-making. A promising approach to NLOS sensing is through single-photon LiDAR, …
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Mobile Multi-Bounce LiDAR
… sensors that can measure the propagation of light in a scene, capturing higher-order reflections, shadows, and light transport that ordinary cameras are unable to. Measurement of these multi-bounce light paths is especially useful for non-line-of-sight (NLOS) imaging. The increasing …
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The Design and Modeling of Ultra-Wideband Position-Location Networks
Impulse-based Ultrawideband (UWB) is a form of signaling which uses streams of pulses of very short duration, typically on the order of a nanosecond. Impulse-based UWB systems possess the ability to fuse accurate position-location with low-data rate communication, and provide covertness for …
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GNSS pre-correlation waveform feature extraction methods for multipath-afflicted signal classification
Prime goal of this research is to propose and test novel algorithms for GNSS multipath environment classification on the receiver Digital Signal Processing (DSP) stage, but at an earlier processing point than it is used usually; at the generation of the digitized samples of the RF signal. Towards …
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Real-time sub-carrier Adaptive Modulation and Coding in wideband Orthogonal Frequency Division Multiplexing wireless systems
… Orthogonal Frequency Division Multiplexing (OFDM) channels to obtain higher data rates. While prior work has discussed the value of sub-carrier AMC from a theoretical perspective, this work presents the design and performance of a real-time sub-carrier AMC system. We describe our OFDM …
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Data Fusion For Improved TOA/TDOA Position Determination in Wireless Systems
… for providing position location (PL) information of a user, requesting for E-911 service, by October 2000. The wireless 911 rules adopted by the FCC are aimed both for improving the reliability of the wireless 911 services and for providing the enhanced features generally available for wireline …
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… cell deployment. However, since the adoption of this band is new, there is a distinct shortage of propagation data and accurate channel modeling at 3.5 GHz in indoor environments. These models are necessary for cellular coverage planning and evaluating the performance and feasibility of …
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Smart Base Station Antenna Performance for Several Scenarios - an Experimental and Modeling Investigation
… in wireless communication systems. Understanding of the smart base antenna performance mechanisms for various environments is important to design cost effective systems and network. This dissertation focuses on the experimental characterization and modeling of the smart base station antenna …
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Non-Line-of-Sight localisation of a sound source
… localisation techniques that are accurate in Non-Line-of-Sight (NLoS) conditions and system implementation of the proposed techniques. Such conditions can cause positive bias errors, namely NLoS errors, in the measured Time-of-Arrivals (ToAs) of first-arrival signals received by microphones …
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Energy saving and reliability of wireless body area networks for health applications
A Wireless Body Sensor Network (WBSN) consists of several biological sensors. WBSN can be employed to monitor patients’ medical conditions. Energy consumption and reliability are critical issues in WBSNs, as the nodes that are placed near the sink node consume more energy. All biomedical packets …
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