2024-09-22 18:49 UTC
New blog post: Not-LoRa GRCon24 CTF challenge. This year I contributed a challenge track to the @gnuradio CTF. The idea of this challenge was to decode some analog voice signals that had been chirp spread using the same chirp parameters as common LoRa configurations.
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@destevez@mastodon.social 2024-09-22 18:49
The voice signals in this challenge included narrowband FM, AM, and SSB. The SSB signal was almost hiding below the noise floor to make things even harder. In the post I explain how to solve the challenge, including a trick to avoid having to do phase alignment when dechirping.