LoRa Transceiver With Improved Characteristics

Jovalekic, Nikola; Drndarevic, Vujo; Darby, I. G.; Zennaro, Marco; Pietrosémoli, Ermanno; Ricciato, Fabio

doi:10.1109/lwc.2018.2855744

Cited by 24 publications

(11 citation statements)

References 6 publications

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“…It can be seen that ODT transceiver constantly has the highest SNR, as well as the highest PRR. This is the consequence of the lowest noise floor which is provided with a special hardware design approach described in [ 10 ]. This enables the ODT to decode very weak signals and maximize range.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The layout of each experiment was identical; namely, two different ODTs were sending packets simultaneously at

MHz and

MHz, while three different transceivers were receiving packets at

MHz and an additional one at

MHz. In the

MHz band, ODT [ 10 ], Libelium [ 16 ], and Uputronics [ 17 ] were receiving packets in parallel, while another one ODT was receiving packets at

MHz. Commercial transceivers were selected based on their cost and prevalence in different deployments.…”

Section: Materials Experimental Setup and Methodsmentioning

confidence: 99%

“…In addition, in both works, only one frequency band is investigated, namely

MHz in [ 7 ] and

MHz in [ 9 ], hence advantages of using one over another frequency band cannot be quantified. Moreover, only one pair of commercial LoRa transceivers were used in the experiments; this can limit the insight in the technology capabilities, especially if we take into account the fact that commercial transceivers are usually not optimized in terms of sensitivity [ 10 ]. This is due to different trade-offs in the design which are necessary to be done in order to build general purpose transceiver.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, we explored different LoRa parameters, covering all characteristic cases: (1) minimum sensitivity of the transceiver by setting

and

kHz; (2) mid-range value as a trade-off between sensitivity and data rate by setting

and

kHz; and (3) maximum sensitivity by setting

and

kHz. To make experimental data more reliable, we deployed three different transceivers on the receive side, where one was own-developed and optimized in terms of sensitivity [ 10 ], and two were commercial transceivers. Finally, to provide an accurate interpretation of experimental data, we performed laboratory measurements and provided scaling factors for RSS indicators of all three transceivers, and determined linear and saturation regions of operation for SNR measurement chain of each transceiver used in the experiments.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of LoRa Transmission over Seawater

Jovalekic

Drndarevic

Pietrosémoli

et al. 2018

Sensors

Self Cite

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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: 8680.266667emMHz and 4340.266667emMHz. 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, SF∈[7,10,12], within a bandwidth of BW=1250.266667emkHz and Coding Rate CR=4/6. The experiments showed that LoRa links are fully feasible over seawater at distances at least 220.266667emkm 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 280.266667emkm obstructed LOS oversea path in ISM 4340.266667emMHz band, but using costly, higher gain antennas. Furthermore, the laboratory experiments revealed that RSSI is linear in a wide range, up to −500.266667emdBm, whereas the SNR measurement chain goes into saturation for Received Signal Strength (RSS) values higher than −1000.266667emdBm. These findings enabled accurate interpretation of the results obtained in field experiments.

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Section: Experimental Results and Analysismentioning

confidence: 99%

“…The layout of each experiment was identical; namely, two different ODTs were sending packets simultaneously at

MHz and

MHz, while three different transceivers were receiving packets at

MHz and an additional one at

MHz. In the

MHz band, ODT [ 10 ], Libelium [ 16 ], and Uputronics [ 17 ] were receiving packets in parallel, while another one ODT was receiving packets at

MHz. Commercial transceivers were selected based on their cost and prevalence in different deployments.…”

Section: Materials Experimental Setup and Methodsmentioning

confidence: 99%

“…In addition, in both works, only one frequency band is investigated, namely

MHz in [ 7 ] and

Section: Introductionmentioning

confidence: 99%

“…In addition, we explored different LoRa parameters, covering all characteristic cases: (1) minimum sensitivity of the transceiver by setting

and

kHz; (2) mid-range value as a trade-off between sensitivity and data rate by setting

and

kHz; and (3) maximum sensitivity by setting

and

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of LoRa Transmission over Seawater

Jovalekic

Drndarevic

Pietrosémoli

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…With regards to long LoRa links, References [25,26] put forward interesting clues validated by a common measurements setup exploiting an overhead location (i.e., a mountain) to install one of the two end links. While the deployment scenario described in this paper does not present such orographic properties, comparable results were achieved, in terms of correctly received packets, with the ones obtained by the authors of Reference [25].…”

Section: Related Workmentioning

confidence: 99%

Low Power Wide Area Networks (LPWAN) at Sea: Performance Analysis of Offshore Data Transmission by Means of LoRaWAN Connectivity for Marine Monitoring Applications

Parri

Parrino

Peruzzi

et al. 2019

Sensors

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In this paper the authors discuss the realization of a Long Range Wide Area Network (LoRaWAN) network infrastructure to be employed for monitoring activities within the marine environment. In particular, transmission ranges as well as the assessment of parameters like Signal to Noise Ratio (SNR) and Received Signal Strength Indicator (RSSI) are analyzed in the specific context of an aquaculture industrial plant, setting up a transmission channel from an offshore monitoring structure provided with a LoRaWAN transmitter, to an ashore receiving device composed of two LoRaWAN Gateways. A theoretical analysis about the feasibility of the transmission is provided. The performances of the system are then measured with different network parameters (in particular the Spreading Factor—SF) as well as with two different heights for the transmitting antenna. Test results prove that efficient data transmission can be achieved at a distance of 8.33 km even using worst case network settings: this suggests the effectiveness of the system even in harsher environmental conditions, thus entailing a lower quality of the transmission channel, or for larger transmission ranges.

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