January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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LoRa physical layer
LoRa represents the physical layer of a LoRaWAN network. It manages the modulation, power, receiver and transmission radios, and signal conditioning.
The architecture is based on the following bands in ISM license-free space:
- 915 MHz: In the USA with power limits but no duty cycle limit.
- 868 MHz: In Europe with a 1% and 10% duty cycle.
- 433 MHz: In Asia.
A derivative of Chirp Spread Spectrum (CSS) is the modulation technique used in LoRa. CSS balances data rate with sensitivity in a fixed channel bandwidth. CSS was first used in the 1940s for military long-range communication by using modulated chirp pulses to encode data and was found to be especially resilient against interference, Doppler effects, and multipath. Chirps ...
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