Συντάχθηκε 18-11-2011 13:50
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
ΚΙΜΙΩΝΗ ΙΩΑΝΝΗ
με θέμα
“Design and Implementation of Backscatter Links with Software Defined
Radio for Wireless Sensor Network Applications”
Τρίτη 22 Νοεμβρίου 2011, 12μμ
Αίθουσα Β.1008, Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Επ. Καθ. ΆΆγγελος Μπλέτσας (επιβλέπων)
Επ. Καθ. Γεώργιος Ν. Καρυστινός
Καθ. Αθανάσιος Π. Λιάβας
Abstract
Backscatter radio is an appealing communication scheme, common in radio frequency identification (RFID), which
can be used in wireless sensor networks (WSNs) for environmental sensing. A centralized reader transmits a carrier,
which is reflected with modulated information by antenna-equipped sensors. The reader extracts each sensor’s
information from the reflected signals and thus, a sensor does not utilize an active radio. Therefore, a sensor
demands significantly lower energy and costs much less, compared to conventional WSN technologies (e.g.
802.15.4/ZigBee). However, intelligent (i.e. non-trivial) design for the sensors and the reader is required.
In this thesis, a complete backscatter system is designed and implemented, by utilizing communication, radio, circuit,
RF electronics, and signal processing theory. A custom backscatter sensor is built from first principles, along with a
reader, which is implemented with commodity, low-cost soft- ware defined radio (SDR). Backscatter links are tested,
demonstrating their inherent tradeoffs in terms of range, bit-error-rate (BER) and multiple access. Theoretical
results match simulation and are experimentally validated with the constructed testbed. This work is a proof of
concept for ultra-low cost and low power wireless communication by means of backscatter and low-cost SDR
technology. The implemented testbed serves as a practical and efficient solution for backscatter radio research.
