How LoRa Modulation really works - long range communication using chirps
LoRa (LoRaWAN) is a new modulation technique optimised for long range, low power, low bitrate communication. You’ll often hear people say LoRa uses “Chirp Spread Spectrum’, but this alone is only a small part of the story. LoRa uses an elegant mathematical trick to allow more efficient receivers. In this video, I outline how LoRa modulation works - it is incredibly unique. I was amazed how LoRa can communicate well beneath the noise floor. I tested the performance of LoRa with a Matlab livescript demonstration.
00:00 Introduction
01:00 Chirps as the basis for LoRa
04:20 Towards a mathematical description of the LoRa symbol
09:00 Correlation
12:34 Our first attempt at a receiver
13:12 Towards a more efficient receiver using a “mathematical trick“
16:40 Performance of LoRa
18:54 Matlab code to simulate a LoRa system
26:32 Summary
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