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 97 for “"communication link"”.
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Memory and data communication link architecture for micro-implants
… we propose and demonstrate a low-power wireless link that exploits RFID techniques as a way of uploading the stored data.
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Spatial tracker for an air-to-ground laser communication link
… of a spatial tracker for an air-to-ground laser communication system; these include a PWM switching amplifier and the control systems for driving the primary steering and tracking elements required in the acquisition and maintenance of an optical communication link. The hardware was designed for …
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A wireless communication link for a miniature, implantable neuromodulation system
Neuromodulation is a promising treatment for a variety of otherwise intractable medical conditions. Current neuromodulation devices are large, single-purpose, and limited in functionality. Draper developed a novel, implantable neuromodulation system to address these shortcomings. The system is …
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Autonomous Navigation of a Ground Vehicle to Optimize Communication Link Quality
… environment, the network must be able maintain communication by adapting to subsystems moving relative to each other. A theoretical and experimental foundation is developed that allows an autonomous ground vehicle to serve as an adaptive communication node in a larger network. The vehicle may …
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Supervisory control of an autonomous underwater vehicle using an acoustic communication link
… that relies on a very-low-data-rate acoustic communication link. A human supervisor communicates with the AUV over a combination radio/acoustic network. The supervisor radios commands from shore to data repeater nodes moored at strategic locations on the ocean surface. Utility Acoustic Modems …
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Performance analysis of H.264 encoder for high-definition video transmission over ultra-wideband communication link.
… feasibility using the Ultra-wideband (UWB) communication channel is analyzed. The UWB channel is selected for its short-range, high-speed data transmission capability at low-cost, and low-power consumption. The maximum transmitting range of this technology is about 10 m at 100 Mbps data …
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Design and modeling of wireless link for biomedical implantable applications
… possible. For these microsystems, the wireless communication link is essential to ensure robust communications between an implanted device and an external monitoring apparatus. For most cases, the communication link is composed of power link and data link. The power link consists of two closely …
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The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development
… the installation of redundant and secondary communication systems to assure that contact can be established with coal miners who may become trapped underground as a result of an event such as a fire, explosion, or inundation. For half a century, the orientation towards underground …
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Tracking algorithms under boundary layer effects for free-space optical communications
Free-space optical communication requires accurate tracking to maintain links. The tracking problem between an aircraft and satellite becomes more difficult with the introduction of a turret on the aircraft for increased field-of-regard. In the case of a hemispherical turret, the disrupted airflow …
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Distributed beamforming in wireless sensor networks
… using sensor clusters for establishing a communication link to the UAV. Results showed that the antenna main lobe remained relatively unchanged in the presence of position errors and sensor node failures or when the density of the sensor nodes changed. Additionally, the maximum average …
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Machine Learning and Spectrum Sensing Cognitive Radio for Satcom Interference Detection
<p>Satellite communications can be interfered from intentional or unintentional sources, which causes the degradation of their communication links. This interference further leads to a reduction of data passed through the communication link and reduction of access times. Due to these risks, the …
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The Effectiveness Of Data Codes And Hardware Selection To Mitigate Scintillation Effects On Free Space Optical Data Transmission
The design of an optical communication link must plan for the random effects of atmospheric turbulence. This study analyses data from an experiment which transmitted from a laser located 8 meters above ground over a 13 Km range to coherent detection devices approximately 162 meters above ground. …
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Optical Communication Systems for Smart Dust
In this thesis, the optical communication systems for millimeter-scale sensing and communication devises known as "Smart Dust" are described and analyzed. A smart dust element is a self-contained sensing and communication system that can be combined into roughly a cubic-millimeter mote to perform …
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Percepção dos deficientes visuais totais sobre os sujeitos da enfermagem
… well as determining behaviors and serving as a communication link through voice and touch.
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Digital image compression on parallel computer architectures
… in computer memory and/or transmit it over a communication link. Over the past decade advancements in technology have spawned many applications of digital imaging, such as photo videotex, desktop publishing, graphics arts, colour facsimile, newspaper wirephoto transmission, medical imaging. …
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System requirements for a dual polarized space to earth communications link
System engineers are currently planning satellite communications links in the 20/30 GHz bands and frequency reuse through orthogonal polarizations. This thesis examines the system level constraints imposed by medium effects at these high frequencies of which the most serious is rain induced …
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Performance evaluation of nonlinear satellite link by computer simulation
… carrier passes through the typical satellite communication link, that consists of a transmit earth station, a satellite transponder, and a receiving earth station. All the signals used in the simulation procedure are real-valued and are transformed back and forth between time and frequency …
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A Technique for Evaluating the Uncertainties in Path Loss Predictions Caused by Sparsely Sampled Terrain Data
… provide an estimate of the power loss in a communication link caused by the surface of the ground, atmospheric refraction, foliage, and other environmental factors. Many of the models rely on digital topographic databases to provide information about the terrain, and generally the databases …
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Sensing, Actuation, and Embedded Control for a Custom SCR Nitrogen Oxides Emissions Reduction System
… Arduino. The controller network establishes communication link between sensor data collection and a raspberry pi controller to enable full control over the test station.</p>
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Spectrum sharing in cognitive radio networks
Years of growth in wireless communication services and conservative spectrum allocation policies by government regulators have led to spectrum scarcity. On the other hand, spectrum measurement campaigns have indicated that the actual occupancy of most licensed frequency bands is quite low. In …
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