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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
EN
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EL
| URI | http://purl.tuc.gr/dl/dias/A26F9EA5-41C9-49FB-80FD-4B50B5594429 | - |
| Identifier | https://doi.org/10.26233/heallink.tuc.93841 | - |
| Language | en | - |
| Extent | 50 pages | en |
| Extent | 1 megabyte | en |
| Title | Inference-Based distributed user association and resource allocation in wireless networks | en |
| Title | Κατανεμημένη κατανομή πόρων και συσχέτιση χρηστών σε ασύρματα δίκτυα με τεχνικές συμπερασμού | el |
| Creator | Chatzigeorgiou Roza | en |
| Creator | Χατζηγεωργιου Ροζα | el |
| Contributor [Thesis Supervisor] | Bletsas Aggelos | en |
| Contributor [Thesis Supervisor] | Μπλετσας Αγγελος | el |
| Contributor [Committee Member] | Samoladas Vasilis | en |
| Contributor [Committee Member] | Σαμολαδας Βασιλης | el |
| Contributor [Committee Member] | Spyropoulos Thrasyvoulos | en |
| Contributor [Committee Member] | Σπυροπουλος Θρασυβουλος | el |
| Publisher | Πολυτεχνείο Κρήτης | el |
| Publisher | Technical University of Crete | en |
| Academic Unit | Technical University of Crete::School of Electrical and Computer Engineering | en |
| Academic Unit | Πολυτεχνείο Κρήτης::Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών | el |
| Content Summary | This work distributively solves the problems of user association and resource allocation in wireless networks. Distributed methods dispense the computational burden across the terminals/base stations of a network and are usually preferred over centralized methods, in which computing is done at a central location. First, the belief propagation (BP) algorithm is utilized for joint time and frequency allocation in wireless sensor networks; BP is inherently distributed, due to its message passing nature. In this work, the convergence of BP for the resource allocation problem is re-visited from a control-theory approach; performance evaluation is also provided for two methods, namely restarting and perturbed BP. Next, the problem of energy efficient user association in the downlink of heterogeneous networks is solved in a distributed, inference-based manner. The problem is first expressed as a linear program (LP). Max product BP is a distributed, message passing algorithm which can be utilized to obtain the solution of the LP, under certain conditions. Considering the loopy nature of the established graphical model, it is important that convergence and correctness of the max product algorithm is guaranteed. Therefore, the problem is relaxed, fixing the number of users per base station and the number of active base stations; then it is proved that max product BP converges with arbitrary initialization to the solution of the LP, in a finite number of iterations. Complexity is also reduced and expressed as a function of the number of active base stations and serving users. Finally, numerical results compare the performance of the proposed distributed algorithm with state-of-the-art. The results show that the proposed approach offers higher geometric mean of energy efficiency compared to previous work, without sacrificing spectral efficiency. | en |
| Type of Item | Μεταπτυχιακή Διατριβή | el |
| Type of Item | Master Thesis | en |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2022-11-03 | - |
| Date of Publication | 2022 | - |
| Subject | Wireless sensor networks | en |
| Subject | User association | en |
| Subject | Resource Allocation | en |
| Subject | Message-passing | en |
| Subject | Inference | en |
| Subject | Heterogeneous networks | en |
| Subject | Energy efficiency | en |
| Bibliographic Citation | Roza Chatzigeorgiou, "Inference-Based distributed user association and resource allocation in wireless networks", Master Thesis, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2022 | en |
| Bibliographic Citation | Ρόζα Χατζηγεωργίου, "Κατανεμημένη κατανομή πόρων και συσχέτιση χρηστών σε ασύρματα δίκτυα με τεχνικές συμπερασμού", Μεταπτυχιακή Διατριβή, Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών, Πολυτεχνείο Κρήτης, Χανιά, Ελλάς, 2022 | el |
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