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Optimum FiniteLength Equalization for Multicarrier Transceivers

Summary: Optimum Finite­Length Equalization for Multicarrier
Naofal Al­Dhahir , Student Member, IEEE, and John M. Cioffi, Senior Member, IEEE
Information Systems Laboratory
Electrical Engineering Department
Stanford University \Lambda
A new criterion for partially--equalizing severe--ISI channels to reduce the cyclic prefix overhead
of the Discrete Multitone Transceiver (DMT) is introduced. The equalized DMT is shown to recover
a significant portion of the performance loss incurred because of the use of a moderate size FFT in
the DMT to reduce implementation cost. In particular, equalizers designed using our new criterion
are shown to result in a higher DMT margin than traditional mean--square--error equalizers. Finally,
we outline additional promising methods to further enhance the performance of the equalized DMT.
I. Introduction
Multicarrier modulation (MCM) has been recently demonstrated to be a viable technology
for high--speed data transmission over spectrally--shaped noisy channels. Modems designed using
the MCM principle parse, using an orthogonal transformation, the channel spectrum (which
could exhibit wide variations over the transmission bandwidth) into a large number of parallel,
independent, and flat subchannels. The optimum orthogonal transformation is based on the
eigendecomposition of a channel--and--noise--dependent matrix [12], which under the assumption


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering