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The full meaning of “FDMA” is Frequency Division Multiple Access. FDMA is a channel access method used in multiple-access protocols as a channelization protocol. FDMA gives users an individual allocation of one or several frequency bands, or channels. It is particularly commonplace in satellite communication. FDMA, like other Multiple Access systems, coordinates access between multiple users. Alternatives include TDMA, CDMA, or SDMA. These protocols are utilized differently, at different levels of the theoretical OSI model. In FDMA all users share the satellite transponder or frequency channel simultaneously but each user transmits at single frequency.

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