Συντάχθηκε 08-10-2012 13:18
από Eleni Stamataki
Email συντάκτη: estamataki<στο>tuc.gr
Ενημερώθηκε:
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Ιδιότητα: σύνταξη/αποχώρηση υπάλληλος.
Τμήμα Ηλεκτρονικών Μηχανικών & Μηχανικών Υπολογιστών
ΠΑΡΟΥΣΙΑΣΗ ΔΙΠΛΩΜΑΤΙΚΗΣ ΕΡΓΑΣΙΑΣ
Αλιμπέρτη Εμμανουήλ
με θέμα
“Community RF Sensing”
Τρίτη 9 Οκτωβρίου 2012, 16.00 μμ
Αίθουσα 2041, Κτίριο Επιστημών, Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Επ. Καθ. Άγγελος Μπλέτσας (επιβλέπων)
Καθ. Μίνως Γαροφαλάκης
Επικ. Καθ. Μιχαήλ Γ. Λαγουδάκης
Abstract
Cellular mobile telephony (GSM or newer UMTS) is currently used by over 4 billions users, indicating great success of the relevant technologies. The received signal power levels at each geographical region are very important since they define the quality of service. Thus, received signal strength (RSS) recording networks have emerged the last few years, such as those in the Hermes or Android's openSignalMaps projects. However, Hermes project deploys measuring stations at fixed locations only and records the whole RF band, while OpenSignalMaps does not include recordings of user transmission power levels or other important details.
This thesis develops community RF sensing using as sensors the mobile phones of users; cellular telephony coverage maps are created by user measurements with the iPhone (3G, 3Gs, 4G) platform. A community geographical information system (GIS) is implemented, consisting of the MySignals iPhone application running at each participating user, a central MySQL database (DB) and a website that displays the acquired coverage maps. A real world evaluation was performed with seven iPhone users for the city of Chania. Over 40000 RSS measurements have been collected within 3 weeks in an automated and user-transparent way. A time/space analysis was performed demonstrating the RSS variance over time and discovering particular areas with very poor signal. Finally, an introduction to cell towers position discovery was also considered, by careful application of particle filtering. The system is designed to support a large number of user-sensors and could assist in city-wide evaluations of existing cellular telephony network deployments.
Συνημμένα:
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ΑΝΑΚΟΙΝΩΣΗ ΠΑΡΟΥΣΙΑΣΗΣ ΑΛΙΜΠΕΡΤΗΣ ΕΜΜΑΝΟΥΗΛ.docx
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