Προσαρμοστικές στοιχειοκεραίες για κινητές δορυφορικές επικοινωνίες

Μάρκου, Ανδριανός

Reconfigurable antenna arrays in mobile satellite Communications

Master Thesis

Author

Μάρκου, Ανδριανός

Date

2017

Abstract

The increasing commercial demand for mobile satellite communications (Mobile Satellite Service, MSS) with guaranteed high quality of service (QoS), high bit rates with low error rate (BER) and high mobility ability of users, using modern compact devices (handheld ), results in the study both of these characteristics governing the satellite link and the presentation of new proposals in antenna systems development area that meet the above requirements. The subject of this thesis is the study of modern multi-input-multiple output models (ΜΙΜΟ) mobile satellite channels in the light of the latest models of mobile satellite communications designed to apply to them a reconfigurable antenna array. Initially it is attempted a short description of mobile satellite systems (Mobile Satellite Service), the architectural structure and the synthetic parts, available frequencies, modern standards (DVB-SH) but mainly geometric orbital characteristics that influence the development of a successful link. In the next chapter are studied the characteristics of a satellite channel, the propagation mechanisms by heterogeneous layers of the atmosphere and the constantly alternating earth space due to mobility and analyzed the results of these mechanisms in force characteristics of the radio information signal. In the third chapter, it is described the various categories of fading while under these it is demostrated the need for statistical description of the mobile satellite channel. Additionally it is analyzes basic stochastic models of fading for wireless communications multipath propagation and shading phenomena, but mainly presented two modern multi statements propagation models. Then, the fourth chapter briefly describes the various diversity profit-driven techniques in satellite communications for the desired creation of ΜΙΜΟ information transmission channels and the SIMO mobile satellite channel through antenna diversity technique . In chapter 5, after the necessary antenna theory it is presented, sizes and those effects associated with this study (mutual coupling), then extensively it is analyzed the theory of parasitic arrays and especially the 5-ESPAR. Also studied a proposed new vision of the radiation pattern of the antenna radiation diagrams field (BeamSpace Domain) Finally, is implemented with the use of software MATLAB the dynamic control of the radiation pattern for a 5-ESPAR antenna for specific LEO orbit coordinations and it is demonstrated the optimized solution algorithm for the successful steering of the antenna pattern in the direction of the moving satellite.

Postgraduate Studies Programme

Ψηφιακές Επικοινωνίες και Δίκτυα

Department

Σχολή Τεχνολογιών Πληροφορικής και Επικοινωνιών. Τμήμα Ψηφιακών Συστημάτων

Number of pages

123

Language

Greek

URI

https://dione.lib.unipi.gr/xmlui/handle/unipi/10500

Collections

Τμήμα Ψηφιακών Συστημάτων

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