Loudify

For my graduation project I extended the LoRa GNU Radio module gr-lora_sdr into Loudify: a client running a GNU Radio flowgraph, a worker doing the actual demodulation, and a broker connecting the two over ZMQ.

The project — a Centralized Radio Access Network gateway for LoRa — researches whether LoRa packets received by different gateways can be aggregated at a central point, letting gateways share information about the signals they receive.

Architecture

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Loudify consists of three parts:

The GNU Radio module

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The signal processing lives in gr-lora_sdr, a GNU Radio out-of-tree module that can:

• Transmit LoRa packets from USRP to USRP, from a commercial LoRa transceiver to a USRP and the other way around (tested with the Adafruit Feather 32u4 RFM95)
• Produce fully end-to-end experimental performance results of a LoRa SDR receiver at low SNRs
• Handle spreading factors 7–12, coding rates 0–4, implicit and explicit header mode and payloads up to the LoRa maximum of 255 bytes
• Verify the payload CRC and explicit header checksum

Installing

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The easiest way is straight from PyPI:

pip install loudify

Or from source, using flit:

git clone https://github.com/martynvdijke/loudify
cd loudify
pip install flit
flit install

Links

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• Source code: github.com/martynvdijke/loudify
• Documentation: loudify.readthedocs.io
• GNU Radio module: github.com/martynvdijke/gr-lora_sdr