Скачать или смотреть What are frequency division duplex and Time Division Duplex in telecommunication?

The most frequent form of communication is bidirectional communication which allows simultaneous transmitting and receiving. A system capable of doing this is called full-duplex. One can also achieve full-duplex capability if sending and receiving do not occur simultaneously but switching between both phases is done so fast that it is not noticed by the user, i.e. both directions can be used quasi-simultaneously. Modern digital mobile radio systems are always full-duplex capable. Essentially, two basic duplex procedures are employed: Frequency Division Duplex (FDD) using different frequency bands in each direction, and Time Division Duplex (TDD) which periodically switches the direction of transmission.

Frequency Division Duplex (FDD) is a technique used in analog and digital mobile radio systems. It divides the available frequency band into two distinct partial bands: the uplink band and the downlink band. The uplink band is used for transmitting signals from the mobile device to the base station, while the downlink band carries signals from the base station to the mobile device. By employing sharp filters, FDD ensures effective separation and minimizes interference between the uplink and downlink transmissions. This technique enhances the overall capacity and performance of mobile communication systems.

On the other hand, Time Division Duplex (TDD) achieves bidirectional communication over a single frequency channel by dividing the transmission time into alternating time slots. Each time slot is dedicated to either uplink or downlink communication. Timing synchronization between devices is crucial in TDD to ensure proper switching between uplink and downlink transmissions. TDD efficiently utilizes the available frequency spectrum and offers flexibility in allocating time slots dynamically based on communication needs and traffic conditions.


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