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FDM Frequency Division Multiplexing - translation to English
![The passband of an FDM channel carrying digital data, modulated by QPSK [[quadrature phase-shift keying]].](https://commons.wikimedia.org/wiki/Special:FilePath/Screenshot-fdm-75-random-am.png?width=200 "The passband of an FDM channel carrying digital data, modulated by QPSK [[quadrature phase-shift keying]].")
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Definition
Wikipedia
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate signal. This allows a single transmission medium such as a microwave radio link, cable or optical fiber to be shared by multiple independent signals. Another use is to carry separate serial bits or segments of a higher rate signal in parallel.
The most common example of frequency-division multiplexing is radio and television broadcasting, in which multiple radio signals at different frequencies pass through the air at the same time. Another example is cable television, in which many television channels are carried simultaneously on a single cable. FDM is also used by telephone systems to transmit multiple telephone calls through high capacity trunklines, communications satellites to transmit multiple channels of data on uplink and downlink radio beams, and broadband DSL modems to transmit large amounts of computer data through twisted pair telephone lines, among many other uses.
An analogous technique called wavelength division multiplexing is used in fiber-optic communication, in which multiple channels of data are transmitted over a single optical fiber using different wavelengths (frequencies).
