Physical Layer Analysis of LoRa Protocol by Means of a Coexistence Case Study
Resumo
Low-Power Wide Area Networks represent a new communication paradigm which allows for small amounts of data to be transmitted over long distances in a very low power manner at the cost of a reduced data rate. These networks are gaining a lot of momentum and becoming very popular in the context of the Internet of Things. This is mainly due to the wide range of new and existing applications they can serve in multiple industries, like logistics and precision agriculture. Among the most popular LPWAN networks in the market today, LoRaWAN has been largely adopted and shows great potential for growth in the upcoming years. In this paper, it is presented an implementation of a LoRaWAN radio link in order to evaluate its physical layer and its coexistence performance. The LoRa modulation/demodulation process is described based on packets captured using a software de?ned radio. The robustness of the protocol against wide band interferers is investigated through a coexistence experiment done in a con?ned environment. The results show that, even though it is simple and lightweight, the LoRaWAN network is extremely robust against interferers. However, there is a clear trade-o? between the e?ectiveness to suppress the interference and the data rate of the transmission, which also a?ect the size of the payload allowed per packet.
Referências
Lte evolution for IoT connectivity 2016 [online] Available: https://onestore.nokia.com/asset/200178.
2018 [online] Available: https://www.sigfox.com/en.
E. Pasqua Lpwan emerging as fastest growing iot communication technology September 2018.
Semtech acquires wireless long range ip provider cycleo March 2012 [online] Available: https://investors.semtech.com/static-files/a785a7e4-4099-4e56-8d6a-f69a98b24884.
AN1200.22 May 2015 [online] Available: https://www.semtech.com/uploads/documents/an1200.22.pdf.
M. Centenaro L. Vangelista A. Zanella M. Zorzi "Long-range communications in unlicensed bands: the rising stars in the iot and smart city scenarios" IEEE Wireless Communications vol. 23 no. 5 pp. 60-67 October 2016.
Lorawan what is it? March 2015.
N. Sornin M. Luis T. Eirich T. Kramp O. Hersent "Lorawan specification v1.0.2" July 2016 [online] Available: https://lora-alliance.org/resource-hub/lorawantm-specification-v102.
137 MHz to 1020 MHz Low Power Long Range Transceiver Semtech January 2019 [online] Available: https://www.semtech.com/uploads/documents/DS_SX1276-7-8-9_W_APP_V6.pdf.
The things network 2019 [online] Available: https://www.thethingsnetwork.org/.
SX1301 Datasheet Semtech June 2017.
SX1308 Datasheet Semtech June 2017.
T. Telkamp 2015 [online] Available: https://github.com/tftelkamp/single_chan_pkt_fwd.
J. L. Sech Single channel packet forwarder 2016 [online] Available: https://github.com/jlesech/single_chan_pkt_fwd.
RFM95/96/97/98(W) - Low Power Long Range Transceiver Module 2017.
Raspberry pi 3 model b February 2016 [online] Available: https://www.raspberrypi.org/products/raspberry-pi-3-model-b/.
H. Boksem 2016 [online] Available: https://github.com/bokse001/dual_chan_pkt_fwd/.
S76S LoRa Wireless Communication Module October 2016.
Loramac-node v4.4.1 March 2018 [online] Available: https://github.com/Lora-net/LoRaMac-node/tree/v4.4.1.
Loramac-node api documentation v4.4.1 March 2018 [online] Available: http://stackforce.github.io/LoRaMac-doc/.
M. Walters Inspectrum 2016 [online] Available: https://github.com/miek/inspectrum.
What is baudline? 2010 [online] Available: http://www.baudline.com/what_is_baudline.html.
T. S. Rappaport Wireless Communications: Principles and Practice Prentice Hall 2002.
F. Sforza "Communications system" Patent EP2 2010.
O. B. A. Seller N. Sornin "Low power long range transmitter" Patent EP2 2013.
Lorawan academy 2019 [online] Available: https://lora-developers.semtech.com/resources/lorawan-academy.
