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guardband

A security frequency band, guardband, is an unused frequency band that lies between two adjacent transmission frequency bands or, in mobile radio networks, between the transmission frequencies for the uplink and downlink.

A guard frequency band is typically used in systems that use Frequency Division Multiple Access( FDMA) and avoids interference between adjacent channels.

Frequency division multiplexing with subcarrier bands separated by guard bands.

Frequency division multiplexing with subcarrier bands separated by guard bands.

Guardbands are used in radio-based broadband systems such as Wireless Regional Area Networks(WRAN), but also in mobile radio systems such as GSM or DECT and in radio networks such as Bluetooth. In addition to channel separation, the guardband prevents mutual interference.

Due to the constant demand for additional frequency bands and the restrictions imposed by the frequency usage plan, unused guard bands, known as white spaces, are also used for mobile communications, among other things.

Informations:
Englisch: guardband
Updated at: 26.02.2018
#Words: 139
Links: security, frequency band, transmission, mobile radio, uplink (UL)
Translations: DE
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