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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Hatim Zaghloul who wrote (5774)10/31/1999 9:11:00 PM
From: Bernard Levy  Read Replies (2) of 12823
 
Hatim:

At the risk of sounding picky, I would like to point
out that the CSCO publication you referred me to
just says that DMT is more general than OFDM, since
it allows different sizes of QAM constellation in
the different frequency subchannels depending on the
SNR ratio present (DMT implements an approximation
of the ``water-filling' scheme for achieving the
capacity of a Gaussian channel).

As for removing the effect of the freq. selective fading,
you are just telling me that WOFDM uses a different
equalizer for each subchannel. In essence this is also
what DMT implements, where the equalizer consists
of a single complex gain for each subchannel. I am
also under the impression that the peak to average power
ratio problem was solved completely for DMT (see the
book by Cioffi, starr and Silverman).

Best regards,

Bernard Levy
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