frequency division multiplexing - ορισμός. Τι είναι το frequency division multiplexing
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Τι (ποιος) είναι frequency division multiplexing - ορισμός

MULTIPLEXING DIVIDING A COMM MEDIUM INTO NON-OVERLAPPING FREQUENCY BANDS, EACH CARRYING A SEPARATE SIGNAL
Frequency division multiplexing; Frequency division multiplex; Frequency Division Multiplex; Frequency-division multiplex
  • The passband of an FDM channel carrying digital data, modulated by QPSK [[quadrature phase-shift keying]].

Frequency-division multiplexing         
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 cable or optical fiber to be shared by multiple independent signals.
frequency division multiplexing         
<communications> (FDM) The simultaneous transmission of multiple separate signals through a shared medium (such as a wire, optical fibre, or light beam) by modulating, at the transmitter, the separate signals into separable frequency bands, and adding those results linearly either before transmission or within the medium. While thus combined, all the signals may be amplified, conducted, translated in frequency and routed toward a destination as a single signal, resulting in economies which are the motivation for multiplexing. Apparatus at the receiver separates the multiplexed signals by means of frequency passing or rejecting filters, and demodulates the results individually, each in the manner appropriate for the modulation scheme used for that band or group. Bands are joined to form groups, and groups may then be joined into larger groups; this process may be considered recursively, but such technique is common only in large and sophisticated systems and is not a necessary part of FDM. Neither the transmitters nor the receivers need be close to each other; ordinary radio, television, and cable service are examples of FDM. It was once the mainstay of the long distance telephone system. The more recently developed {time division multiplexing} in its several forms lends itself to the handling of digital data, but the low cost and high quality of available FDM equipment, especially that intended for television signals, make it a reasonable choice for many purposes. Compare wavelength division multiplexing, {time division multiplexing}, code division multiplexing. (2001-06-28)
Orthogonal frequency-division multiplexing         
  • Subcarriers system of OFDM signals after [[FFT]]
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METHOD OF ENCODING DIGITAL DATA ON MULTIPLE CARRIER FREQUENCIES
COFDM; Coded orthogonal frequency division modulation; Discrete multitone modulation; OFDM; Orthogonal frequency division multiplexing; Coded orthogonal frequency division multiplexing; Orthogonal frequency division modulation; Coded orthogonal frequency-division multiplexing; Flash-OFDM; BST-COFDM; Discrete Multi-Tone; Discrete Multitone Modulation; Optical orthogonal code; Optical Orthogonal Code; Discrete multitone technique; OFDM system comparison table; Discrete multi-tone modulation; ODFM; Orthogonal Frequency Division Multiplexing; CODFM; Bandwidth Efficiency Comparison between single carrier and multi carrier optical transmission system; Ofdm; Inter Carrier Interface; Coded OFDM; FLASH-OFDM; Discrete multitone
In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a type of digital transmission and a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, used in applications such as digital television and audio broadcasting, DSL internet access, wireless networks, power line networks, and 4G/5G mobile communications.

Βικιπαίδεια

Frequency-division multiplexing

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).