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Frequency Division Multiplexing (FDM)

- It is an analog technique.
- Signals of different frequencies are combined into a composite signal and is transmitted on the signal link.
- Bandwidth of link should be greater than the combined bandwidth of various channels.
- Each signals have different frequencies.
- Channels are separated by strip of unused bandwidth called Guard bands to prevent from overlapping.

- FDM is used for FM and AM radio broadcasting.
- FDM is used for television broadcasting.
- First generation telephone also use FDM.