Tech moves fast! Stay ahead of the curve with Techopedia!
Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia.
Frequency Division Multiple Access (FDMA) is a channel access technique found in multiple-access protocols as a channelization protocol.
FDMA permits individual allocation of single or multiple frequency bands, or channels to the users. FDMA, just like any other multiple access system, harmonizes access between multiple users.
Some alternatives include Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA), or Time Division Multiple Access (TDMA). These protocols are used in different ways, at different stages of the theoretical Open Systems Interconnection (OSI) model.
FDMA is different from frequency division duplexing (FDD). While FDMA permits multiple users to simultaneously access a transmission system, FDD describes the way the radio channel is shared between the downlink and uplink.
FDMA is also different from Frequency-division multiplexing (FDM). FDM refers to a physical layer method that blends and transmits low-bandwidth channels via a high-bandwidth channel. FDMA, in contrast, is a channel access technique in the data link layer.