FDMA is the basic technology for advanced mobile phone services. The features of FDMA are as follows.

• FDMA allots a different sub-band of frequency to each different user to access the network.
• If FDMA is not in use, the channel is left idle instead of allotting to the other users.
• FDMA is implemented in Narrowband systems and it is less complex than TDMA.
• Tight filtering is done here to reduce adjacent channel interference.
• The base station BS and mobile station MS, transmit and receive simultaneously and continuously in FDMA.