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One of the favourite low-power radio techniques in Internet of Things research is “backscatter communications”: the transmitter sends a signal to a Thing, and the Thing modulates its data onto the reflection, and that's decoded by a receiver.
… hundreds of metres or more, according to boffins who presented their work to the Association of Computing Machinery's UbiComp today (September 13).
Washington - University - Researchers - Thing - Consuming
The Washington University researchers showed that a Thing consuming just 9.25 microwatts (while active)could cover a 4,800 square foot (for non-Americans, about 445 square metres) house that and a one-acre (0.4 hectare) vegetable farm.
In a point-to-point hop, the researchers claimed a 2.8 km range.
Paper - Challenges - Kind - Performance
As the paper points out, the two big challenges in getting this kind of performance were:
Using commodity hardware as the receiver.
Researchers - LoRa - Standard - Backscatter - Scheme
The researchers modified the LoRa wireless standard for their backscatter scheme,...
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