Explain Frequency Division Multiplexing?


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Shumaela Rana answered
Frequency Division multiplexing or FDM is an analog technique which is used to multiplex signals. Frequency Division multiplexing or FDM can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted. In FDM, the signals generated by each sending device modulate different carrier frequencies. After that, these modulated signals are combined into a single composite signal that can be transported by the link. Carrier frequencies are separated by sufficient band width to accommodate the modulated signal. These bandwidth ranges are the channels through which the various signals travel.

Channels must be separated by strips of unused bandwidth (guard bands) to prevent signals from overlapping. In addition, carrier frequencies must not interfere with the original data frequencies. Failure to adhere to either condition can result in the unsuccessful recovery of the original signals. A very common application of FDM is AM and FM radio broadcasting. Radio uses the air as the transmission medium. A special band, from 350 to 1700 KHz, is assigned to AM radio. All radio stations require sharing this band. Implementation of FDM is not that much complicated or tough task. It can be implemented very easily.

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