Frequency-division duplexing (FDD) is a method for establishing a full-duplex communications link that uses two different radio frequencies for transmitter and receiver operation.

Is FDD half-duplex?

In FDD half-duplex, a separated frequency is used for uplink and downlink communication with guard subframe in between and receivers or transmitters do not perform both operations simultaneously [29].

Is LTE FDD full duplex?

LTE-M supports both frequency-division duplex (FDD) operation and time-division duplex (TDD) operation. In FDD operation, two different carrier frequencies are used for DL and UL.