Chapter · LoRa
The packet and the noise
Bandwidth, coding and the packet, airtime as the real cost, and decoding below the noise but not through an interferer.
- 04Bandwidth, coding and the packet5 minA packet is a preamble, a header, a payload and a check, and every part has a time on the air. This lesson widens the band, adds coding and drops the header, and reads the total off the timeline.
- 05Airtime is the real payload cost4 minWhat a message costs on a LoRa link is the time it occupies the channel, and that is set mostly by the radio settings, not the bytes. This lesson works one reproducible packet through the airtime formula.
- 06Below the noise, not through interference5 minA LoRa receiver can decode a packet whose power is below the noise in its band, because it knows the waveform to look for. It cannot decode through a strong interferer. This lesson keeps the two checks apart.
Start at 04 and read down — the order is the order things get easier in. Or take the one with your part in it; every article stands on its own, and links back to whatever it needs.