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 13 of 13 for “"Frequency assignment"”.
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Upper and lower bounds for the fixed spectrum frequency assignment problem
The frequency assignment problem involves the assignment of discrete channels (frequencies) to the transmitters of a radio network. A separation between the frequencies assigned to transmitters close to each other is required to avoid interference. Unnecessary separation causes an excess …
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Definition of a Common Formulation of Military Frequency Assignment Problems and the Application of Meta-Heuristic Algorithms
… is to define a common formulation for military frequency assignment problems, in a form which allows the application of meta-heuristic algorithms. Currently different frequency assignment systems are in use in the four areas of the military, in the categories of land, air, maritime and …
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Improving the capacity of radio spectrum: exploration of the acyclic orientations of a graph
The efficient use of radio spectrum depends upon frequency assignment within a telecommunications network. The solution space of the frequency assignment problem is best described by the acyclic orientations of the network. An acyclic orientation Ɵ of a graph (network) G is an orientation of the …
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Assignment of Spreading Codes in Code Division Multiple Access Radio Systems
… concerned with spreading code construction and assignment in Direct Sequence Code Division Multiple Access radio systems. Particular emphasis is given to Quasi-Synchronous Code Division Multiple Access. The frequency spectrum required for these systems depends on the length of the spreading code …
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Implicit network descriptions of RLC networks and the problem of re-engineering
… evolution (of system properties) are linked to Frequency Assignment, as far as natural frequencies under re-engineering and this requires use of techniques developed within control theory for Frequency Assignment Problems.
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Optimal Access Point Selection and Channel Assignment in IEEE 802.11 Networks
… of access points (APs) in the demand areas and assignment of radio frequencies to each AP. Coverage and capacity are some key issues when placing APs in a demand area. APs need to cover all users. A user is considered covered if the power received from its corresponding AP is greater than a …
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Electronic warfare asset allocation with human-swarm interaction
… requires the placement in 3D-spatiality, center frequency assignment, and antenna azimuth and elevation orientation, with respect to power coverage at the receiver without overloading the feed-horn, maintaining suficient power sensitivity levels, and maintaining terrain constraints. Further …
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Strategies for meeting future capacity needs on the light rail MBTA Green Line
… evaluation and operations planning including frequency assignment, scheduled setting, and vehicle allocation are relatively well-understood problems for simple public transit lines. However, complex systems like the Green Line - those with multiple overlapping service patterns or branches …
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Optimizing resource allocation in large communications satellite constellations
… Beam Shaping, User Grouping, Satellite Routing, Frequency Assignment, and Gateway Routing problems are proposed, tailored for large non-geostationary orbit constellations with satellites at multiple altitudes, referred to as hybrid systems. The methods leverage optimization to find an optimized …
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The re-engineering of VHF mobile radio services in the UK
… be troublesome up to at least the 11th order. A frequency assignment plan covering mobile and fixed services for the country is derived and the dominating influence of the intermods is shown to result in a workable, but unconventional version.
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Adaptation For Multi-Antenna Systems
… energy efficiency in the presence of unoccupied frequency bands and on spectrally efficient operation under static frequency assignment. Utilizing minimum Euclidean distances of MoDem constellations and the minimum free Hamming distance metrics for channel codes, we develop distance metrics to …
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Robustness of Reinforcement Learning Systems in Real-World Environments
… I introduce a novel RL system for solving the frequency assignment problem for multibeam satellite constellations. By conducting a comprehensive search over six major design decisions, I identify a design variation that achieves a 99.8% success rate in 100-beam scenarios. However, this …