Experimental Study of LoRa Transmission over Seawater
Low Power Wide Area Networks (LPWANs) are gaining attention in both academia and industry by offering the possibility of connecting a large number of nodes over extended distances. LoRa is one of the technologies used as a physical layer in such networks. This paper investigates the LoRa links over...
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doaj-36c778e3d8b645ea8249f80c6a7acf1e2020-11-25T00:13:17ZengMDPI AGSensors1424-82202018-08-01189285310.3390/s18092853s18092853Experimental Study of LoRa Transmission over SeawaterNikola Jovalekic0Vujo Drndarevic1Ermanno Pietrosemoli2Iain Darby3Marco Zennaro4Department of Electronics, School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11060 Belgrade, SerbiaDepartment of Electronics, School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11060 Belgrade, SerbiaTelecommunications/ICT4D Lab, ICTP, Str. Costiera 11, 34151 Trieste, ItalyIAEA Nuclear Science and Instrumentation Laboratory, IAEA Laboratories Seibersdorf A-2444, 2444 Seibersdorf, AustriaTelecommunications/ICT4D Lab, ICTP, Str. Costiera 11, 34151 Trieste, ItalyLow Power Wide Area Networks (LPWANs) are gaining attention in both academia and industry by offering the possibility of connecting a large number of nodes over extended distances. LoRa is one of the technologies used as a physical layer in such networks. This paper investigates the LoRa links over seawater in two typical scenarios: clear Line-of-Sight (LOS) and obstructed path in two different Industrial, Scientific and Medical (ISM) radio bands: 868 MHz and 434 MHz. We used three different LoRa devices in the experiments: the Own Developed LoRa Transceiver (ODT) and two commercial transceivers. Firstly we investigated transceivers’ Receive Signal Strength Indicator (RSSI) and Signal-to-Noise (SNR) measurement chain linearity and provided correction factors for RSSI to correlate it with actual signal levels received at transceivers’ inputs. Next, we carried out field experiments for three different LoRa Spreading Factors, S F ∈ [ 7 , 10 , 12 ] , within a bandwidth of B W = 125 kHz and Coding Rate C R = 4 / 6 . The experiments showed that LoRa links are fully feasible over seawater at distances at least 22 km long, using only low-cost off-the-shelf rubber duck antennas in LOS path condition in both ISM bands. In addition, we showed that LoRa links can be established over 28 km obstructed LOS oversea path in ISM 434 MHz band, but using costly, higher gain antennas. Furthermore, the laboratory experiments revealed that RSSI is linear in a wide range, up to − 50 dBm, whereas the SNR measurement chain goes into saturation for Received Signal Strength (RSS) values higher than − 100 dBm. These findings enabled accurate interpretation of the results obtained in field experiments.http://www.mdpi.com/1424-8220/18/9/2853LoRaIoTLPWANseatransmission |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nikola Jovalekic Vujo Drndarevic Ermanno Pietrosemoli Iain Darby Marco Zennaro |
spellingShingle |
Nikola Jovalekic Vujo Drndarevic Ermanno Pietrosemoli Iain Darby Marco Zennaro Experimental Study of LoRa Transmission over Seawater Sensors LoRa IoT LPWAN sea transmission |
author_facet |
Nikola Jovalekic Vujo Drndarevic Ermanno Pietrosemoli Iain Darby Marco Zennaro |
author_sort |
Nikola Jovalekic |
title |
Experimental Study of LoRa Transmission over Seawater |
title_short |
Experimental Study of LoRa Transmission over Seawater |
title_full |
Experimental Study of LoRa Transmission over Seawater |
title_fullStr |
Experimental Study of LoRa Transmission over Seawater |
title_full_unstemmed |
Experimental Study of LoRa Transmission over Seawater |
title_sort |
experimental study of lora transmission over seawater |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2018-08-01 |
description |
Low Power Wide Area Networks (LPWANs) are gaining attention in both academia and industry by offering the possibility of connecting a large number of nodes over extended distances. LoRa is one of the technologies used as a physical layer in such networks. This paper investigates the LoRa links over seawater in two typical scenarios: clear Line-of-Sight (LOS) and obstructed path in two different Industrial, Scientific and Medical (ISM) radio bands: 868 MHz and 434 MHz. We used three different LoRa devices in the experiments: the Own Developed LoRa Transceiver (ODT) and two commercial transceivers. Firstly we investigated transceivers’ Receive Signal Strength Indicator (RSSI) and Signal-to-Noise (SNR) measurement chain linearity and provided correction factors for RSSI to correlate it with actual signal levels received at transceivers’ inputs. Next, we carried out field experiments for three different LoRa Spreading Factors, S F ∈ [ 7 , 10 , 12 ] , within a bandwidth of B W = 125 kHz and Coding Rate C R = 4 / 6 . The experiments showed that LoRa links are fully feasible over seawater at distances at least 22 km long, using only low-cost off-the-shelf rubber duck antennas in LOS path condition in both ISM bands. In addition, we showed that LoRa links can be established over 28 km obstructed LOS oversea path in ISM 434 MHz band, but using costly, higher gain antennas. Furthermore, the laboratory experiments revealed that RSSI is linear in a wide range, up to − 50 dBm, whereas the SNR measurement chain goes into saturation for Received Signal Strength (RSS) values higher than − 100 dBm. These findings enabled accurate interpretation of the results obtained in field experiments. |
topic |
LoRa IoT LPWAN sea transmission |
url |
http://www.mdpi.com/1424-8220/18/9/2853 |
work_keys_str_mv |
AT nikolajovalekic experimentalstudyofloratransmissionoverseawater AT vujodrndarevic experimentalstudyofloratransmissionoverseawater AT ermannopietrosemoli experimentalstudyofloratransmissionoverseawater AT iaindarby experimentalstudyofloratransmissionoverseawater AT marcozennaro experimentalstudyofloratransmissionoverseawater |
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