7.3. DMT Physical Layer Standard

Discrete multitone transmission (DMT) is the only worldwide standard for ADSL, and VDSL transmission using DMT is the most efficient of the high-performance transmission methods that allow a transmission system to perform near the fundamental limit known as capacity [6]. For difficult transmission lines, there is no other cost-effective high-performance alternative presently, and VDSL has the most difficult transmission environment of all DSLs. Variants of DMT for wireless transmission (known as OFDM) have also come into strong use in the areas of wireless local area networks (IEEE 802.11(a), [8]), wireless broadband access (IEEE 802.16 [20]), as well as digital terrestrial television (HDTV and digital TV) and ...

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