How does wifi work, mobile signals and other wireless transmission work?
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Way to broad of a question. This would require several “upper division” college level courses to cover correctly.
The basic idea is that radio transmissions use a carrier frequency which is just a sinewave of a specific frequency. Different modulation methods (amplitude, frequency, phase, on-off keying, etc) are applied to this sinewave which modify it slightly depending upon what signal you are trying to transfer over radio.
On the receiver end, the carrier frequency of interest is filtered from all the other radio waves traveling through space. The modulation is reversed recovering the original message. The software then interprets the message and performs whatever actions are required upon its receipt.
There are numerous topics here–how do you modulate/demodulate, how do you make a transmitter of radio waves, how do you filter a specific frequency, how do you discriminate one message from another using the same standard (i.e. wifi or mobile), etc.
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