How does FDM transmit multiple signals across a single conductor such as coaxial cable simultaneously?
In: Engineering
It’s very similar to how multiple radio stations can all be transmitting at once yet you can listen to one at a time. Each signal is on a different channel, consisting of a range of frequencies. At the receiving end you tune into that range and exclude the others to extract a single signal.
As long as there is enough separation between two different signals channel (i.e. the frequencies they use are far enough apart) they won’t interfere. If you looked at all the signals at once, it would look like noise, but if you use a filter to allow only one channel’s frequencies, you can pull out just that one signal from the rest.
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