What is Time Division Duplex (TDD)?
Jul 27, 2020
Time-division duplexing (TDD) is a method for emulating full-duplex communication over a half-duplex communication link. The transmitter and receiver both use the same frequency band but transmit and receive traffic at different times. TDD uses the same frequency band by assigning alternating time slots for transmit and receive operations. The information to be transmitted, whether it’s voice, video, or computer data, is in a serial binary format. Each time slot may be 1 byte long or could be a frame of multiple bytes.
In time-division duplexing (TDD), time is used to separate the transmission and reception of the signals, rather than frequency (like in FDD), and thus a single frequency is assigned to a user for both directions. TDD provides a simultaneous bidirectional flow of information. Duplexers are therefore not required, and thus the cost of a TDD system is not very high, as the transmitter and receiver use the same components like filters and mixers.
TDD uses two-time slots, one for upstream (transmission) and the other for downstream (reception). A guard time between transmit and receive streams is allocated. Time-division duplexing facilitates concurrent send and receive by assigning transmitted signals in the one-time slot and received signals in another time slot. They share the same frequency channel.
TDD is used by Wi-Fi Networks and Some 4G/LTE Networks as well. Click here to see the LTE Bands that use TDD technology.
Advantages of TDD
Disadvantages of TDD
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