How does wifi work, mobile signals and other wireless transmission work?
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Radio signals are waves of electromagnetic energy. Waves all have different attributes that can be measured, like frequency and amplitude. The wave is generated by whatever device is transmitting information, and the receiver measures different attributes of the wave that it sees on its antenna. The frequency and amplitude of the waves can be changed by the transmitter and interpreted by the receiver. By deciding on a frequency or amplitude that represents a zero, and a different frequency or amplitude to represent a one, your transmitter and receiver can share binary information. Once you can do that, you can create patterns for letters or numbers, just like using Morse code. The signals and protocols get more and more complex to establish things like when the devices are allowed to transmit, how much they can transmit, what type of information they’re allowed to receive, etc.
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