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Meritev pokritja in prodora signala nizkoenergijskega prostranega omrežja
ID Grosar, Jernej (Author), ID Ricciato, Fabio (Mentor) More about this mentor... This link opens in a new window

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PID: 20.500.12556/rul/264d1b59-40e1-4677-a62d-24a6f6905eca

Abstract
Brezžična senzorska omrežja (ang. wireless sensor networks, krajše WSN) so iz dneva v dan bolj razširjena in igrajo vedno večjo vlogo v našem življenju. Danes ta omreža večinoma uporabljajo večskočne tehnologije kratkega dometa kot so ZigBee, Z-Wave ali Bluetooth, vendar so te nepraktične, če hočemo z njimi zagotoviti pokritost večjega območja ali celotnega mesta. Pred kratkim se je, kot rešitev tega problema, pojavila nova tehnologija imenovana nizkoenergijsko prostrano omrežje (ang. Low Power Wide Area Network, ali krajše LPWAN). Ta ima, v primerjavi z brezžičnimi senzorskimi omrežji, boljši domet, daljšo življenjsko dobo baterije (naprava lahko delujejo več let z eno samo baterijo) in večinoma uporablja enoskočno brezžično povezavo. Ena takih tehnologije je tudi radio dolgega dometa (ang. Long Range Radio, krajše LoRa), okoli katere je zgrajena ta magisterska naloga. Cilj našega dela je bil razviti fleksibilno, prilagodljivo in odprtokodno platformo za kratkoročno ali dolgoročno merjenje pokritja in prodora signala nizkoenergijskega prostranega omrežja. Po končanem razvoju raziskovalne platforme smo se osredotočili na merjenje pokritosti in prodora LoRa signala v različnih okoljih. Pri vseh teh meritvah smo, zaradi lažje kasnejše primerjave rezultatov med različnimi okolji, uporabili enake kombinacije nastavitev LoRa modulacijskih parametrov. Večinoma smo se osredotočili na meritve v zaprtih prostorih in na ulicah, naredili pa smo tudi nekaj testov dometa LoRa signala. Najboljši rezultat (najdaljši domet signala), ki smo ga dosegli pri teh meritvah je bil 39 kilometrov. Na tej točki je bil signal še vedno močen, sprejem paketov pa prav tako zadovoljiv, vendar smo morali zaradi tehničnih težav meritev prekiniti.

Language:English
Keywords:LoRa, nizkoenergijsko prostrano omrežje, internet stvari, odprtokodno, raziskovalna platforma
Work type:Master's thesis/paper
Organization:FRI - Faculty of Computer and Information Science
Year:2017
PID:20.500.12556/RUL-96296 This link opens in a new window
Publication date in RUL:28.09.2017
Views:1549
Downloads:956
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Secondary language

Language:Slovenian
Title:Coverage and penetration measurements for Low Power Wide Area Network signals
Abstract:
Wireless sensor networks (WSN) are evermore widespread and play from day to day a bigger role in our lives. Up to date, such networks use multi-hop short-range wireless technologies such as ZigBee, Z-Wave or Bluetooth. This technologies are unpractical to use, if one wants the coverage of an area in the size of a city. Lately, new technologies called Low Power Wide Area Networks (LPWAN) emerged. They have greater range, longer battery life (they can work on single battery for few years) and they mostly use single-hop wireless communication. One such technology, which we will focus on in this master's thesis, is a Long Range Radio or LoRa for short. The goal of our work is to develop an open source, free to use, scalable research platform for conducting short or long term LoRa signal penetration and coverage measurements. With this platform finished, we focused on performing a LoRa signal penetration and coverage measurements in different environments. For all this measurements the same sets of LoRa modulation parameter settings were used, so one can easily compare the signal propagation in different environments. We mainly focused on urban and indoor measurements, but few range tests were also conducted. In one of this range tests, the distance of 39 kilometers was achieved. At this point the signal was still quite strong and packet reception was still satisfying, but due to technical problems, measurement had to be finished.

Keywords:LoRa, Low Power Wide Area Networks, Internet of Things, open source, research platform

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