Discrete multi-tone, or DMT, is a type of digital modulation used in some telecommunications systems. It is a form of frequency-division multiplexing (FDM), and can be thought of as an extension of the older single-carrier FDMA. In DMT, each subcarrier in an FDM system is modulated with its own unique signal using one of several available modulation schemes. This allows for more efficient use of the available bandwidth than traditional FDM while still providing compatibility with legacy equipment.
DMT has been used extensively in ADSL and VDSL broadband Internet access systems, as well as other applications such as voice over IP (VoIP) and cable television modems. It offers several advantages over other forms of digital modulation, including resistance to crosstalk and noise immunity. Additionally, DMT provides for flexible allocation of subcarriers to different users on the same link, allowing for more efficient use of resources in time-division multiplexed (TDM) applications such as VoIP.
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