Impact of Spreading Factor Imperfect Orthogonality in LoRa Communications

Research output: Contribution to conferenceOtherpeer-review

32 Citations (Scopus)


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.
Original languageEnglish
Number of pages15
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • General Computer Science
  • General Mathematics


Dive into the research topics of 'Impact of Spreading Factor Imperfect Orthogonality in LoRa Communications'. Together they form a unique fingerprint.

Cite this