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frequency division multiple access (access method) (FDMA)

Frequency Division Multiple Access (FDMA) is a multiple access method that allows many users to access a common radio medium. In the FDMA process, the available frequency band is divided into individual narrowband frequency channels.

The FDMA method makes better use of existing transmission capacities because the available bandwidths and time slots can be shared by many users at the same time. The individual communication channels are separated using orthogonal binary codes. The entire transmission capacity of the radio channel is thus available to each individual subscriber.

Prinip of FDMA with multiple frequency channels

Prinip of FDMA with multiple frequency channels

At the beginning of a transmission, the two communication partners are assigned a radio channel which is available to them until the end of the transmission. For duplex operation, the participants have two separate radio channels available for transmitting and receiving.

Frequency division multiplexing for FDMA

Frequency division multiplexing for FDMA

The difference between FDMA and Frequency Division Multiplexing( FDM) is that FDMA still has a control channel, which is used to dynamically distribute channels to users.

FDMA is mainly used on the air interface in mobile radio systems, such as the C-Network. FDMA is also used for analogdata transmission via radio links or by means of wireline technology, and also in mobile communications combined with Time Division Multiple Access( TDMA) in GSM.

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Englisch: frequency division multiple access (access method) - FDMA
Updated at: 26.03.2011
#Words: 210
Links: method, medium, indium (In), process, frequency band
Translations: DE
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