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 356 for “"Free Space"”.
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Interferometry-based Free Space Communication And Information Processing
… and high beam scanning resolution. A C-MOS based free space optical transceiver for bi-directional communication has also been experimentally demonstrated. For high speed, large bandwidth, and high frequency operation, an optically implemented reconfigurable RF transversal filter design is …
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Free space exploration from a single RGB image
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Silicon Photomultipliers as Free Space Optical Communication Sensors
Free-space optical communications (FSOC) is a growing field that presents an attractive alternative to the the current technology standard of radio frequency (RF) communications. Typical optical carriers have smaller SWaP in comparison to RF systems due to the difference in required aperture sizes. …
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Free space optic communication for Navy surface ship platforms
Free Space Optics (FSO) technology is an alternative broadband technology, which provides fast, secure and reliable data transmission. The FSO systems are being used for commercial systems between fixed sites and are being considered for military systems because of their inherent benefits, which …
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Wireless personal area networks and free-space optical links
… systems: infrared data association (IrDA) and free space optics (FSO). A model for the IrDA (indoor infrared) link layer is developed by considering the presence of bit errors. Based on this model, the effect of propagation delay on the link through put is investigated. An optimization study is …
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Secure communication through free-space channel using quantum illumination
… extend the QI secure communication protocol to a free-space propagation channel. Unlike a fiber channel, a free-space channel is susceptible to air turbulence. Because a single spatial mode of light is essential in the QI protocol, if the beam path is affected by air turbulence, the power and …
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Classical capacity of the free-space quantum-optical channel
… classical information carrying capacity of the free-space quantum optical channel has been studied thoroughly in both the far-field and near-field propagation regimes. Results have been obtained for the optimal capacity, in which information rate is maximized over both transmitter encodings and …
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EMG methods for prosthesis ankle-subtalar free-space control
EMG-based prosthetic joint controllers have been an active research field for more than fifty years. However, several challenges remain to be addressed[9]. Electrodes positioning, controllers calibration, and controllers’ linear approximation error are the most challenging problems among them. This …
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Sensorless Wavefront Correction Algorithms for Free-Space Optical Communications
Free-space optical communications (FSOC) technology facilitates high-throughput wireless links across large distances with low size, weight, and power (SWaP) terminals. However, it is difficult to design reliable, low-cost FSOC terminals for long-range links through the atmosphere. Even in clear …
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Free-space phase-fading MIMO: system model and capacity analysis
… analysis are present for a proposed MIMO Free-Space system called "Phase-Fading" system, which is a single-user with multiple-antenna system, where the transmitters and receivers are randomly located in specific areas and the links are dominated by Line-of-Sight (LoS) components. Since …
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System Analysis for Satellite Networks with Free-Space Optical Links
… several system parameters and performances for free-space optical satellite networks (FSOSNs), including phasing parameter, optical satellite link budget, tradeoff between network latency and satellite transmission power, and network latency minimization based on satellite transmission power …
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Free-Space Measurements of Dielectrics and Three-Dimensional Periodic Metamaterials
<p>This thesis presents the free-space measurements of a periodic metamaterial structure. The metamaterial unit cell consists of two dielectric sheets intersecting at 90 degrees. The dielectric is a polyetherimide-based material 0.001” thick. Each sheet has a copper capacitively-loaded loop (CLL) …
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Non-intrusive water utility monitoring and free-space load monitoring
… This work also presents the development of a free-space sensor to provide information about the operation and location of electrical loads: an electroquasistatic (EQS) sensor to detect voltage-mode events. The free-space sensor was able to detect events in a room, such as the activation of a …
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Multi-Transceiver Free-Space-Optical Structures for Mobile Ad-Hoc Networks
… &rdquo model that is tessellated with multiple free-space-optical (FSO) transmitter and receiver (transceiver) pairs that exploit spatial reuse of the shared medium and are capable of handling extremely high data rates using optical modulation techniques. However, because of the highly …
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Outage prediction modelling of terrestrial free space optics for tropical region
In modern times, Free Space Optical (FSO) communication technology has become an alternative way to radio links and optical cables. FSO links provide gigabit per second data rates and unlimited bandwidth, however its availability can easily be affected by fading due to different meteorological …
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