6533b7d0fe1ef96bd125ad8f
RESEARCH PRODUCT
Impact of Spreading Factor Imperfect Orthogonality in LoRa Communications
Domenico GarlisiDaniele CroceIlenia TinnirelloStefano MangioneMichele Gucciardosubject
Computer scienceNetwork packetSettore ING-INF/03 - Telecomunicazioni05 social sciencesinterference020206 networking & telecommunications02 engineering and technologyInterference (wave propagation)Antenna diversityLoRaPower (physics)OrthogonalityPacket loss0502 economics and businessModulation (music)0202 electrical engineering electronic engineering information engineeringspreading factorFadingAlgorithm050203 business & managementdescription
In this paper we study the impact of imperfect-orthogonality in LoRa spreading factors (SFs) in simulation and real-world experiments. First, we analyze LoRa modulation numerically and show that collisions between packets of different SFs can indeed cause packet loss if the interference power received is strong enough. Second, we validate such findings using commercial devices, confirming our numerical results. Third, we modified and extended LoRaSim, an open-source LoRa simulator, to measure the impact of inter-SF collisions and fading (which was not taken into account previously in the simulator). Our results show that non-orthogonality of the SFs can deteriorate significantly the performance especially of higher SFs (10 to 12) and that fading has virtually no impact when multiple gateways are available in space diversity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 |