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 66 for “"non-line-of-sight"”.
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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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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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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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Non-Line of Sight Test Scenario Generation for Connected Autonomous Vehicle
… range can be further constrained by the presence of obstacles in its path or as a result of the geometry of the road, for example, at a junction. This is termed as a non-line of sight (NLOS) scenario where the ego vehicle (system under test) is unable to detect an oncoming dynamic object due to …
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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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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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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
… on the Virginia Tech campus show combinations of specular multipath and diffuse scattering at LMDS frequencies. An algorithm is presented that estimates link performance based on the channel impulse response. Presented and analyzed are representative impulse responses (one is primarily specular …
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Architecture of a cognitive non-line-of-sight backhaul for 5G outdoor urban small cells
… and reliable backhaul solutions using existing roof-mounted backhaul aggregation sites. Using intelligent mmW radio devices and massive multiple-input multiple-output (MIMO), for enabling point-to-multipoint (PtMP) operation, is considered in this research. The core aim of this research is to …
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On-device Classification of Human-induced Non-Line-of-Sight on Chest-Worn Ultra-wideband Wearables
… candidate for precise indoor positioning, offering decimeter-level accuracy with energy efficiency and timely updates. Still, despite these advantages, practical UWB deployments—which are inherently human-centric and typically involve low-power devices worn on or carried by the …
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Hidden object doppler : estimating motion, size and material properties of moving non-line-of-sight objects in cluttered environments
The thesis presents a framework for Non-Line-of-Sight Computer Vision techniques using wave fronts. Using short-pulse illumination and a high speed time-of-flight camera, we propose algorithms that use multi path light transport analysis to explore the environments beyond line of sight. What is …
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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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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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Detection, identification and localization of R/C electronic devices through their unintended emissions
"The accurate and reliable detection of unintended emissions from radio receivers has a broad range of commercial and security applications. This thesis presents detection, identification, and localization methods for multiple RC electronic devices in a realistic environment. First, a Hurst …
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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
This dissertation reports results of an investigation into the performance of adaptive beamforming and diversity combining using antenna arrays that can be mounted on handheld radios. Handheld arrays show great promise for improving the coverage, capacity, and power efficiency of wireless …
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RF-guided exploration for robotic manipulation
… the design, implementation, and evaluation of RVExp, a system that leverages radio perception to design efficient exploration controllers in highly occluded and non-line-of-sight settings. RVExp relies on eye-in-hand vision sensor and battery-less RFID tags attached to the object of …
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Computational illumination for portrait photography and inverse graphics
Supervised training of deep networks has led to remarkable successes in computer vision, for example on image classification or object detection problems. These successes are driven by the availability of large amounts of paired training data with manual ground truth annotations. For many …
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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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A systems approach to the evaluation of Radio Frequency Identification (RFID) in the defense industry
… in the supply chain. RFID tags' fast read rates, non-line-of-sight identification and large storage capacity may revolutionize supply chains in the defense industry and commercial world. Widespread adoption of RFID will require that companies achieve a return on their investment. System …
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Capacity and coverage of mmWave ad hoc networks
… with millimeter-wave (mmWave) devices offers hope to ad hoc networks through higher bandwidth, reduced interference due to directional antennas, and a lighter interference field due to blockage. This report uses a stochastic geometry approach to characterize the one-way and two-way …
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