Excellent explanation of a whole range of radio concepts all in support of describing just how LoRa on 2.4 GHz can travel much farther than WiFi or Bluetooth on the same frequency.
Best 15 minutes you’ll spend this month.
- Frequency
- Penetration
- Modulation including AN, FM, ASK, FSK, QAM
- Noise and noise floor
- Fourier Transform
- Chirp and de-churp
- RF circuit design
- Diversity
- Open source project
- Drone control
There is a preamble, which is a known sequence. The receiver uses the preamble to find the timing and frequency offset for the transmitter. In most LoRA-like systems, the modulation parameters are manually configured at runtime, though there is no reason why dynamic payload params cannot be specified in a header. That’s just a bunch of additional complexity these systems try to avoid most of the time.