Say you need a wireless communication channel to a single device with a range of 1 meter, and a date rate of 10 b/s. What you are after is to minimize the power consumption whilst keeping the antenna small (5x5 cm). What would be the best approach for this?
I'm thinking you need to avoid PLLs etc. because they are just too power hungry. You can generate a single frequency with an oscillator, add some switches and you have a transmitter. I am not too sure about the receiver though.
Or can you use some sort of coupling in this short range? Something similar to wireless charging but for comms.
I have one of those bicycle computers that measure the speed you are going and they seem to last forever. I've done 1000 km and it is still going on its original coin battery. How do they do it?