A demonstration of Chirp-Spread-Spectrum Modulation as used in LoRa, part of a presentation in the Course Computer Networks at Vienna Technical University (Paper, Slides).
Starting with a synchronized received LoRa transmission with low SNR, the demonstration goes through reconstructing the originally sent data step by step.
Sent signal:
Received and filtered signal (Noise is much stronger than data signal):
Dechirped and isolated signal (original signal is recognizable):
Unification and final reconstructed data:
