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Technology Stocks : Amati vs Westell, DMT vs CAP ADSL
WSTL 6.410-1.2%Feb 5 1:33 PM EST
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To: who wrote (115)5/30/1996 9:50:00 AM
From: olduser   of 1365
 
Here is the key technical reference on DWMT, which shows DWMT is a relatively minor variation of DMT.

I hope this is not getting too technical for the folks here.

Wayne

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CONFERENCE PAPER
Tzannes, M.A.; Tzannes, M.C.; Proakis, J.; Heller, P.N.
DMT systems, DWMT systems and digital filter banks.
IN: New Orleans SUPERCOMM/ICC '94. Serving Humanity Through Communications.
1994 IEEE International Conference on Communications. Conference Record (1-5 May
1994). New York, NY, USA: IEEE, 1994. p. 311-15 vol.1.
Pub type: Theoretical or Mathematical.

Abstract: A multicarrier modulation system called discrete multitone (DMT) was
chosen by the American National Standards Institute (ANSI) as a working
standard for asymmetric digital subscriber line (ADSL) signaling. The DMT
system uses the inverse and forward discrete Fourier transform (DFT) for
modulation and demodulation. An alternative to the classic DMT system is to
substitute a discrete wavelet transform in place of the DFT as the
modulating transform. This new method is called discrete wavelet multitone
(DWMT) signaling, and has been shown to be superior to the DMT system in
certain channel environments.
This paper illustrates that the DMT system
and the DWMT system are both based on the theory of M-band wavelet filter
banks. In particular, DMT and DWMT are linked formally through a discussion
of digital multirate filter hanks and digital transmultiplexer. In addition
the advantages of wavelet transform-based transmultiplexers over DFT-based
transmultiplexers are discussed.
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