[nicolsc]

Sigfox relies on

* Ultra Narrow Band (100Hz) modulation

* Low data rate (100 bits/s in Europe, at 14dBm/25mW) + lightweight protocol

* High receiver sensitivity, mostly SDR based

We've got a few youtube videos explaining this ... but mostly targeted for a generic audience. The "radio signal modulation" may have enough tech details to match what you're looking for : https://www.youtube.com/watch?v=gGvM6KEDIdE&index=6&list=PLc...

We're also working on a publication of a standard UNB IoT protocol, Sigfox being one of its implementations. Should come within a few weeks.

There is a draft about the network architecture here : https://datatracker.ietf.org/doc/draft-zuniga-lpwan-sigfox-s...