The Frequency Division duplex (abbreviated as Fdd,frequency Division duplexing) is the use of frequency-separated multi-technology to separate the transmitted and received signals. The sections that are uploaded and downloaded are separated by a "frequency offset" (frequency offset). If the amount of data uploaded and downloaded is similar, the frequency division duplex is more efficient than the time division duplex. In this case, the two-time trade unions in the switching transmission reception, waste some bandwidth, so the delay longer, and its line is more complex and power consumption. Another benefit of frequency division duplex is that it is simpler and more efficient in radio and transceiver planning because a device transmits and receives a different frequency band, so the device does not receive its own outgoing data, and the transmitted and received information does not affect each other. Here are some examples of frequency-division duplex systems: Asymmetric digital subscriber Line (ADSL) and ultra-high-speed user digital loop (VDSL) Most of the mobile system, including the UMTS/WCDMA FDD mode IEEE 802.16 WiMAX FDD mode
Frequency Division Duplex
