I am wondering how does the devices on a wireless connection recognize each other between all other devices, for example A wifi signal from an access point at 2.4GHz wave on channel 2 would communicate at the frequencey of 2413MHz (I think.. but an example more than an accurate statement)
So if you have 5 different devices connecting to it how does it recognize each one? I'm not talking about the upper layer attributes like IP and Mac addresses but more on the actual physical layer, google is just giving me blanks and bad answers and wikipedia and other websites don't give me anything technical.
If the sender sends signals, say 010101010, with the first digits being the address all devices can ignore this except the device with the right address, but what if another devices sends a signal during that send time, they all are at the same frequency so there is no way of finding out who sent that.. so it could actually corrupt the data being transferred, it would be like a room of people just shouting out and all have the same voice? (I don't really know how this works)
BUT this is not the case in all current wireless connections, this is what i want to understand, how does this happen? How do they distinguish each other? If you have 10 devices sending information all at once and on the same frequency and channel then how does the receiver know who sent what?
My main aim is whether you can recognize multiple RFID tags at once at the same time by an RFID reader, for example if 20 people walked at once near an RFID reader it will recognize all of them.. is this possible? This is the main thing i want to find out, also i want to know a the general concept of how the standard wireless connections work and the differences between them, that would be cool, this caught too much of my attention.
Any refrence or help on this topic would be most appreciated! Almost a week and i still cant figure this out nor found any content on it.
Thank you in advance