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Identifier 000421776
Title Coexistence of IEEE 802.15.4g and LoRa Networks at 868 MHz band, PHY layer analysis and evaluation
Alternative Title Συνύπαρξη των ΙΕΕΕ 802.15.4g και LoRa Δικτύων στην 868 MHz περιοχή συχνοτήτων, ανάλυση και αξιολόγηση των φυσικών επιπέδων
Author Καραμολέγκος, Νικόλαος Χ.
Thesis advisor Δημητρόπουλος, Ξενοφώντας
Reviewer Τσακαλίδης, Παναγιώτης
Παπαδοπούλη, Μαρία
Παπαδάκης, Στέφανος
Abstract Internet of Things (IoT) refers to a network of connected physical objects that can communicate. Thanks to cheap processors and wireless networks, it’s possible to turn anything, from a lightbulb to a building, into part of the IoT. Therefore, the most important challenge is the development of wireless protocols that are characterized by low power and long range. Since the introduction of the IoT paradigm, many technologies have been developed in order to support this venture. However, the Low Power Wide Area Networks (LPWANs) appear to be the most promising solution. In this thesis, we focus our interest on two of these protocols: the IEEE 802.15.4g and the Long Range (LoRa). The LoRa protocol is based on spread spectrum modulation and is characterized by low data rate. On the other hand, IEEE 802.15.4g is based mainly on Frequency Shift Keying (FSK) modulation and has higher data rate. Both protocols are operating at the same frequency band which leads to mutual interference. The main objective of this work is to evaluate the Physical (PHY) layers of IEEE 802.15.4g and LoRa and to estimate the effect of the interference to the performance of these two protocols. Also, we suggest solutions and configurations to mitigate the interference and enhance the performance of each protocol. In order to do so, we firstly, implemented a PHY simulator in MATLAB and, secondly, we built a testbed with LoRa and IEEE 802.15.4g devices to verify the results. Furthermore, we investigated the range and the Received Signal Strength Indication (RSSI) of the IEEE 802.15.4 protocol in the FORTH outer area in order to create coverage maps and to calculate the area’s path loss exponent. Finally, we propose a way to build a multi protocol Gateway (GW) which can serve LoRa and IEEE 802.15.4g at the same time based on a Software Defined Radio (SDR) transceiver which was implemented for each protocol.
Language English
Issue date 2019-03-29
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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