Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/9F35BB5A-DB5F-4151-A1DA-BAC7CD53580D | - |
| Αναγνωριστικό | https://doi.org/10.26233/heallink.tuc.88031 | - |
| Γλώσσα | en | - |
| Μέγεθος | 15 megabytes | en |
| Μέγεθος | 158 pages | en |
| Τίτλος | Scatter radio relaying & applications | en |
| Δημιουργός | Vougioukas Georgios | en |
| Δημιουργός | Βουγιουκας Γεωργιος | el |
| Συντελεστής [Επιβλέπων Καθηγητής] | Bletsas Aggelos | en |
| Συντελεστής [Επιβλέπων Καθηγητής] | Μπλετσας Αγγελος | el |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Karystinos Georgios | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Καρυστινος Γεωργιος | el |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Κωνσταντίνος Παπαδιάς | el |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Constantinos Papadias | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Gregory Durgin | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Αναστάσης Πολυκάρπου | el |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Anastasis Polycarpou | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Koutroulis Eftychios | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Κουτρουλης Ευτυχιος | el |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Paterakis Michalis | en |
| Συντελεστής [Μέλος Εξεταστικής Επιτροπής] | Πατερακης Μιχαλης | el |
| Εκδότης | Πολυτεχνείο Κρήτης | el |
| Εκδότης | Technical University of Crete | en |
| Ακαδημαϊκή Μονάδα | Technical University of Crete::School of Electrical and Computer Engineering | en |
| Ακαδημαϊκή Μονάδα | Πολυτεχνείο Κρήτης::Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών | el |
| Περίληψη | Billions of devices are expected to be wirelessly connected in the foreseeable future. Sustaining such connectivity will require simple, elegant, engineering solutions. Based on backscatter radio principles, this dissertation offers novel, ultra-low-complexity, ultra-low-power, ultra-low-cost solutions, for connectivity in the field of narrowband wireless communications. Methods for achieving wireless communication by “recycling” radio waves, pre-existing in the environment, are offered and analysed. In contrast to generating own signals for transmission, a device (tag) adopting the suggested methods can transmit its information towards any conventional FM radio receiver, by recycling ambient signals from FM radio stations. That way, it is shown that batteryless information transmission can be achieved up to distances of 26 meters, by harvesting energy from the environment. Ultra-low cost prototypes consumed only 24 μWatt in continuous (non duty-cycled) operation. In the case of ambient signals of unknown origin and structure, digital modulation schemes are also offered, accompanied by novel coherent, partially-coherent illumination-agnostic, as well as fully noncoherent, channel-coded or uncoded detection algorithms. It is shown that under certain conditions, modulated and unknown ambient signals, can offer performance gains in the process of recovering tag's information signal, i.e., modulation of the ambient signal may be helpful. The proposed schemes do not require any cooperation with the ambient transmitter. That way, in sharp contrast to prior art, the tags adopting the proposed techniques are receiver-less; ultra-low-complexity and batteryless operation are also facilitated. Exploiting the aforementioned methods, originally intended for solving ambient backscatter communication problems, it is demonstrated for the first time that backscattering tags can also be used in an unorthodox way, for relaying signals in the frequency domain. Scatter radio relaying can be used to solve multi-antenna processing problems: a) blind (i.e., zero-feedback) beamforming, offering power gains in the order of 0.4-3.7 dB, and b) direction of arrival (DoA) estimation, offering error less than 5 degrees with 8 scattering tags. The proposed methods utilize single antenna radios without any requirement for channel feedback, multi-antenna RF front-ends or expensive controllers. The proposed techniques extend the solution space for engineers building wireless devices under power, complexity and cost constraints. Hopefully, this work will amplify the recent interest of the research community on backscatter radio and accelerate efforts towards the wide adoption of backscatter radio relaying in current and future commodity wireless systems, sensors and networks. | en |
| Τύπος | Διδακτορική Διατριβή | el |
| Τύπος | Doctoral Dissertation | en |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by-nc-sa/4.0/ | en |
| Ημερομηνία | 2021-01-08 | - |
| Ημερομηνία Δημοσίευσης | 2020 | - |
| Θεματική Κατηγορία | Wireless communications | en |
| Θεματική Κατηγορία | Backscatter radio | en |
| Θεματική Κατηγορία | Ambient backscatter | en |
| Θεματική Κατηγορία | Ultra low power communications | en |
| Βιβλιογραφική Αναφορά | Georgios Vougioukas, "Scatter radio relaying & applications", Doctoral Dissertation, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2020 | en |
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