Frequency Division Duplexing [FDD]

Frequency Division Duplexing (FDD) allows simultaneous communications in both directions using two (or more with carrier aggregation) frequency bands that are divided by a “guard band” (also known as a duplex band or frequency offset). FDD systems use one (or more) frequency bands for communications from base stations to subscribers (the downlink) and a different frequency band for communications from subscribers to base stations (the uplink).

FDD systems are analogous to a two-lane road that allows cars traveling in opposite directions to pass one another safely.

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