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Frequency Division Multiplexing

By Dinesh Thakur

In Frequency Division Multiplexing (FDM), multiple channels are combined onto a single aggregate signal for transmission. The channels are separated in the aggregate by their frequency. It is explained in the Figure where a frequency dimension is subdivided into several non-overlapping frequency bands. Each channel ci is allotted its own frequency band as depicted in Figure.

Frequency Division Multiplexing (FDM)There are always some unused frequency spaces between channels, known as guard bands. These guard bands reduce the effects of overlapping between adjacent channels and therefore, reduces a condition more commonly referred to as crosstalk.

FDM was the first multiplexing scheme to enjoy wide scale network deployment, and such systems are still in use today and are used with analog transmission. However, Time Division Multiplexing is the preferred approach today. The main disadvantage of FOM is the tremendous wastage of frequency resources for all time. Because of this reason, the number of channels is also restricted In FDM scheme.

You’ll also like:

  1. Frequency Division Multiplexing (FDM)
  2. Frequency Division Multiple Access (FDMA).
  3. Statistical Time Division Multiplexing (STDM)
  4. Code Division Multiplexing (CDM)/Spread Spectrum
  5. Time Division Multiplexing
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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


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