Just a reflection about this: Could a modification of this backscattering technique be used so that hundred of this devices use the same channel to transmit a set?, I am thinking about collecting the information of hundred of devices each sending a single bit in the same channel. This must be something like dividing a channel in subchannels but I am thinking about using the same frequency in the final output. Yes, it should be better if I read something about transmission of information.

I am thinking about an API in which you assing a number (index of device) to each device and you receive a set of bits ( for example danger/no danger) without having to make any modification to wifi signals or having to select, create or buy new channels and without danger of interfering with other signals because use a lot of bandwidth.