Frequency Division Multiple Access (FDMA)

Introduction
Frequency Division Multiple Access Used for AMPS and TACS, the two key analog systems and their variants, this system gives each conversation its own unique radio channel. Division of a radio frequency into several channels by splitting the frequency band into distinct segments, which are assigned to various callers. This allows a single base station to serve many callers. For example, a typical AMPS network will have 832 channels spaced approximately 30 kilohertz apart. - Frequency Division Multiple Access, digital transmission technology that combines elements of TDMA and spread spectrum.

Frequency Division Multiple Access. A method allowing multiple carriers to share a single satellite transponder or range of frequencies. The transponder bandwidth is divided into sub-channels, each of which is allocated to a particular earth station (carrier). The earth stations transmit continuously and the transponder conveys several carriers simultaneously at different frequencies.

A method employed to permit several users to transmit simultaneously on one satellite transponder by assigning a specific frequency within the channel to each user. Frequency Division Multiple Access. FDMA systems transmit one voice circuit per channel. Each conversation gets its own, unique, radio channel. The channels are relatively narrow, usually 30 KHz or less and are defined as either transmit or receive channels. A full duplex conversation requires a transmit & receive channel pair. For example, if a FDMA system had 200 channels, the system could handle 100 simultaneously full duplex conversations. (100 channels for transmitting and 100 channels for receiving) Example: FDMA channel With FDMA users share the transponder by prior allocation of individual channels. Single Channel Per Carrier (SCPC) is an FDMA scheme in which the input data stream is used to modulate an RF (radio frequency) carrier and assign dedicated carrier frequency to each client.

Frequency Division Multiple Access system for cellular radio. Frequency Division Multiple Access The analog communications technique that uses a common channel for communication among multiple users allocating unique time slots to different users. The process of dividing bandwidth into multiple frequencies which can be shared out among base transceiver stations (BTS)within the network.