Chirpy, chirpy, cheap, cheap: printable IoT radios for 10 cents each | 9/14/2017 | Staff
Les7799 (Posted by) Level 3
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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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