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hybrid frequency division duplex (HFDD)

Hybrid Frequency Division Duplex (HFDD) is a hybrid duplex technology used in mobile radio systems for radio transmission in the uplink( UL) and downlink( DL). As a hybrid technique, it uses Frequency Division Duplex( FDD) and Time Division Duplex( TDD).

Like FDD technology, HFDD uses two different carrier frequencies in the uplink and downlink, and like TDD technology, it uses time slots for uplink and downlink transmission. This means that in the first time slot, for example, the data in the uplink to the base station is transmitted at the carrier frequency f1, and in the second time slot the data in the downlink from the base station is transmitted at the carrier frequency f2.

It is therefore half-duplex, in which only one station can transmit and the other receive at any one time, and vice versa. The disadvantage is that the data throughput is halved compared to Frequency Division Duplex (FDD).

Informations:
Englisch: hybrid frequency division duplex - HFDD
Updated at: 03.04.2008
#Words: 152
Links: duplex (Dx), mobile radio, transmission, uplink (UL), underwriter laboratory (UL)
Translations: DE
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