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 40 for “"beam forming"”.
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Source array and receiver array analysis of Vogtland/ West Bohemia earthquake clusters
… etwa 0.75 km. 22 Erdbeben wurden für Quellarray- beam forming ausgewählt. Quellarrays sind örtliche Cluster von Erdbeben, die von einer Empfängerstation aufgezeichnet werden. Wegen der Reziprozität der Green’schen Funktionen können diese in ähnlicher Weise genutzt werden wie Empfängerarrays, bei …
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Genetic algorithm design and testing of a random element 3-D 2.4 GHZ phased array transmit antenna constructed of commercial RF microchips
… applications. Corroboration of predicted beam patterns from both Genetic Algorithm and Method of Moments calculations was achieved in anechoic chamber measurements conducted with the test-bed array. Both H-plane and E-plane data runs were made with several phase steered beams. In all cases …
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Design, Characterization and Application of a Multiple Input Stethoscope Apparatus
… of interest were explored using variable-delay beam forming. S1 and S2 heart sound recognition with optimized beam forming delays and inter-symbol noise elimination were investigated for improved discernment of the S1 or S2 heart sounds by a user. Also, stereophonic presentation of heart sounds …
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An electronically focused multiple beam side scan sonar
… has been constrained by the bulk and cost of the beam forming system. High resolution side scan sonar systems have many operational parameters that may only be extended with the aid of phased arrays, the resolution and the imaging rate being the most important. This thesis describes a …
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Development of an antenna system for a relay-based wireless network
… radiation pattern of the relay station, a new beam-forming module is proposed, designed and developed to generate the proper radiation pattern. The beam-forming module incorporating digital phase shifters and attenuator chips is fabricated and tested. The optimization process using the Least …
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Investigation of a Phased Array of Circular Microstrip Patch Elements Conformal to a Paraboloidal Surface
… of a phased array of antenna elements conforming to a paraboloidal surface. We hypothesize that such a conformal phased array would have performance comparable to that of a correspondingly sized planar array. The performance of a paraboloidal array of antenna elements was simulated using …
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Resource Management In 3G Systems Employing Smart Antennas
… provide differentiated Quality of Service (QoS). Beam forming techniques have been proposed to increase the spectral efficiency of the wireless channel. Using beamforming in the network will lead to intra-cell handoffs within the cell due to user mobility. In a commercially deployed next …
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Analysis, Implementation and Considerations for Liquid Crystals as a Reconfigurable Antennas Solution (LiCRAS) for Space
… gain reflector dish antenna apertures for performing communications, but is constantly investing in phase array antenna concepts to provide increased signal flexibility at reduced system costs in terms of finances and system resources. The problem with traditional phased arrays remains the …
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Microwave Lens Designs: Optimization, Fast Simulation Algorithms, and 360-Degree Scanning Techniques
… wide-angle scanning, and true-time delay (TTD) beam forming. They provide ideal performance for applications such as satellites, remote-piloted vehicles, collision-avoidance radars and ultra-wideband communications systems. The emerging printed lenses in recent years have facilitated the …
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Application of smart antennas to wideband code division multiple access : the uplink performance
… adaptive antenna arrays focus narrow high gain beams towards the desired user and nulls towards interferers, both coverage and capacity of the network can be improved. To establish the performance gain that a smart antenna can deliver in a 3G environment (i.e., with mixed traffic), the …
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Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links
… circular microstrip patch element with a wide beamwidth or a miniature phased array antenna that continuously scans to access the satellite(s). The array beam is controlled with a beam-forming network (BFN), which contains 3 or 4-bit phase shifters, which can be made in micro-electro-mechanical …
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Environmental effects of the Beaufort Lens on underwater acoustic communications during Arctic operations
… array throughout the Beaufort Lens. This beam forming was compared to the prediction from BELLHOP. As well, since acoustic communications are affected by multi-path, attenuation and interference from other sources it was interesting to note that bottom bounce was sometimes a reliable …
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Environmental Effects of the Beaufort Lens on Underwater Acoustic Communications during Arctic Operations
… array throughout the Beaufort Lens. This beam forming was compared to the prediction from BELLHOP. As well, since acoustic communications are affected by multi-path, attenuation and interference from other sources it was interesting to note that bottom bounce was sometimes a reliable …
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Time keeping in myriad networks : theories, solutions and applications
… time synchronization, like spatial filtering (beam-forming). The suite of algorithms and applications define a new class of packet switched networks, called Myriad Networks.
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Enhancing Signal Coverage for UHF RFID Systems
… A novel UHF RFID reader antenna with 2D beam-scanning ability, a wide axial ratio (AR) beamwidth and tunable polarisation performance is designed, simulated, measured and tested in Chapter 3 of this thesis. It is experimentally verified that the antenna’s AR minima follow its gain maxima, …
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Machine Learning Enabled-Localization in 5G and LTE Using Image Classification and Deep Learning
… of users to improve resource management and beam forming. Outdoor localization has been traditionally done through Global Positioning System (GPS), however it’s performance degrades in urban settings due to obstruction and multi-path effects, creating the need for better localization …
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Acoustical wave propagation in buried water filled pipes
… Following the simplified analysis, the beam forming method is discussed and applied in order to reduce the noise in the pipe. Moving on to the complete analysis of the pipe, the stiffness matrix method is used to take into account the properties of the system. The solution time is proven …
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Scalable design of high-performance on-chip Terahertz source and imager
… array for high-power and collimated radiation beam at mid-THz band. The array is 2D-coupled, and each element achieves these functions: (i) maximize oscillation at fundamental frequency fo= 2 50 GHz; (ii) synchronize phase of fo and its harmonics among elements; (iii) cancel near-field …
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