Frequency Division Multiplexing

Frequency Division Multiplexing

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Frequency Division Multiplexing (FDM) is a technique used in telecommunications that allows multiple data streams to be combined and transmitted simultaneously over a single communication channel. Each data stream is assigned a different frequency (or “sub-channel”) within the main channel, with the combined streams forming a composite signal.

This technique is analogous to a multi-lane highway where each lane (frequency band) is assigned to a specific car (data signal), allowing multiple cars to travel at the same time without colliding with each other.

FDM is commonly used in radio and television broadcasting, where different channels are transmitted at different frequency bands. For example, each FM radio station broadcasts at a specific frequency, allowing many stations to operate simultaneously without interfering with each other.

Another prominent example of FDM is in the field of telecommunications where it is used in both wired (like DSL broadband connections) and wireless communications (like 3G/4G cellular networks).

A key benefit of FDM is its ability to accommodate multiple users in a given frequency band. However, a limitation is that it requires a certain amount of space between channels to prevent interference, which can limit the total number of channels available.

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