Recently, I was studying the knowledge about wireless rechargeable networks and found that a mobile charger can charge multiple sensor nodes simultaneously. Is there a situation where a node can be charged by multiple chargers at the same time? Please give me some references, thanks very much!
To use one mobile charger to charge multiple nodes at the same time is a very natural and logical action. It is so that the mobile charger emits radio waves which cover its surrounding and therefore any mobile node covered by radio waves can be charged.
The reverse that one uses multiple wireless chargers to charge one node is possible but imposes requirements on the rf wireless receiver harvesting rf signal
from multiple rf sources.
One proposal is introduced by Mohammad where all sources will have the same frequency but differ in phase because of different propagation channels.
If the multiple sources have different frequencies then you need a wide band antenna or multiband antenna. The most straight forward case is to make a receiver for each source and then you sum the DC harvested power from which you can charge the battery of the node.
So, it is possible but costs more.
Best wishes
Nice idea Jiahui Li
Why not? If transmitted RF signals have the same frequency, they will add in the channel, and detected as one signal at the receiver. To maximize the power, you just need to make transmit beamforming (or phase alignment) at transmitters to make sure that signals add coherently in the channel, which requires CSI at the transmitter. Although the paper below is related to different area, but it shows how to maximize the received power by introducing phase shifts to guarantee that signals will add coherently in the wireless medium (you only need to read up to equation (5)).
https://www.techrxiv.org/articles/preprint/Performance_Analysis_of_Wireless_Mesh_Backhauling_Using_Intelligent_Reflecting_Surface/12543167/1
To use one mobile charger to charge multiple nodes at the same time is a very natural and logical action. It is so that the mobile charger emits radio waves which cover its surrounding and therefore any mobile node covered by radio waves can be charged.
The reverse that one uses multiple wireless chargers to charge one node is possible but imposes requirements on the rf wireless receiver harvesting rf signal
from multiple rf sources.
One proposal is introduced by Mohammad where all sources will have the same frequency but differ in phase because of different propagation channels.
If the multiple sources have different frequencies then you need a wide band antenna or multiband antenna. The most straight forward case is to make a receiver for each source and then you sum the DC harvested power from which you can charge the battery of the node.
So, it is possible but costs more.
Best wishes
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