Diseño virtual de un arreglo de antenas para sistemas de radio cognitiva basado en el estándar IEEE 802.22 Wran.
The following thesis includes different proposals and designs, about arrangements and radiant physical structures for Cognitive Radio (CR), which are in the ability to operate in a high bandwidth (54 MHZ – 964 MHz) including the TV band , It also must adapt to the operation of cognitive radio system...
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| Médium: | bachelorThesis |
| Jazyk: | spa |
| Vydáno: |
2016
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| Témata: | |
| On-line přístup: | http://dspace.unl.edu.ec/jspui/handle/123456789/17200 |
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Přidat tag | Shrnutí: | The following thesis includes different proposals and designs, about arrangements and radiant physical structures for Cognitive Radio (CR), which are in the ability to operate in a high bandwidth (54 MHZ – 964 MHz) including the TV band , It also must adapt to the operation of cognitive radio systems in order to obtain the best radio-electric features and propagation of the information. From all the proposals, the most optimal will be chosen, by describing what their transmission characteristics, range, bandwidth, etc., are. In order to be used in systems Cognitive Radio and in this way to get a good performance in them. It begins with a study of antennas in Chapter 4, part 1, which defines and describes the parameters of radiation, types of antennas, radiation features, arrays of antennas, Ultra Wideband antennas (UWB), behavior of radiation diagrams of antennas in array; geometries and operation, state of the art, among others. In addition, it describes different types of arrays, for pad-type antennas, independent antennas of frequency, broadband antennas, with their different behaviors that are adaptable to what is needed in CR systems and which can provide an information base for the designs to be submitted in order to meet the objectives set. After the FCC (Federal Communications Commission) proposed that communications networks are reformed to improve the use of the spectrum and in this way to provide free frequencies for several applications, it began to emerge some alternatives of spectral optimization, such as, Cognitive Radio and, thus a new field of study for antennas that can be complemented with systems CR (Cognitive Radio) and which can be adapted to its operation was opened. In Chapter 4, part 2, the work presents the information gathered about the technologies and related research about this technology, where the concepts, state of the art, applications last trended developments are described. Besides it presents the standard that emerged from this research work which is the 802.22 WRAN (Wide Area Networks). In Chapter 5, different proposals of array designs of antennas are presented; This mathematical design will allow the analysis and comparison of its improvements about electrical, electromagnetic and propagation characteristics, which are adapted to the cognitive radio requirements. Finally, after having the results obtained from the simulator, and knowing the optimal array derived from analysis of its behavior and its parametric effects such as S1,1 (reflection coefficient), the relation of the standing wave (SWR), diagrams of radiation, among others, are discussed in Chapter 6 as the best option to be used physically in any future work, where optimization of Cognitive Radio Networks be the subject of research and study. |
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