LoRa in Software

The physical layer of the LoRa (LoRa PHY) is a proprietary standard owned by Semtech and people have been trying to reverse-engineer the LoRa standard for years with projects such as GR-LoRa, and over the year various people have taken over the works and new projects have come with the latest one being the gr-lora_sdr GNU Radio software-defined radio (SDR) implementation of a LoRa transceiver.

The project has been conducted in collaboration with the Telecommunication Circuits Laboratory of the EPFL (École Polytechnique Fédérale de Lausanne) in Switzerland, and gr-lora_sdr is available as a module for GNU Radio 3.10 with both Tx and Rx implemented so it can be used with hardware compatible with GNU Radio that works in the ISM bands for LoRa (e.g. 433 MHz, 868 MHz, 915 MHz).

[…] Supported parameters

  • Spreading factors – 5-12 (SF5 and SF6 are not compatible with Semtech SX1261/2)

[…] any SDR device that supports GNU Radio can be used

[…] While the project is great for research and education, it might not be a good idea to use it in commercial products as LoRa is patented by Semtech until September 2035 (anticipated expiration).

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