IEEE Transactions on Signal Processing,
vol. 53, no. 10, pp. 3880-3894, Oct. 2005.
Unification and Evaluation of Equalization Structures and
Design Algorithms for Discrete Multitone Systems
Rick K. Martin (1),
Koen Vanbleu (2),
Ming Ding (3),
Geert Ysebaert (4),
Milos Milosevic (5),
Brian L. Evans (6),
Marc Moonen (7), and
C. Rick Johnson, Jr.
(1) Dept. of Electrical and Computer Engineering,
Air Force Institute of Technology,
Wright Patterson Air Force Base, Ohio USA.
(2) Broadcom, Mechelen, Belgium.
(3) Bandspeed, Inc., Austin, TX USA.
(4) Research and Innovation, Alcatel Telecom,
(5) Schlumberger, Sugar Land, TX USA.
(6) Dept. of Electrical and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712-1084 USA.
(7) Katholieke Universiteit Leuven-- ESAT-SCD/SISTA,
(8) Dept. of Electrical and Computer Engineering,
Rhodes Hall, Cornell University,
Ithaca, NY 14853 USA.
ADSL Research at Cornell -
ADSL Research at UT Austin
To ease equalization in a multicarrier system, a cyclic prefix (CP) is
typically inserted between successive symbols. When the channel order
exceeds the CP length, equalization can be accomplished via a time-domain
equalizer (TEQ), which is a finite impulse response (FIR) filter. The TEQ
is placed in cascade with the channel to produce an effective shortened
impulse response. Alternatively, a bank of equalizers can
remove the interference tone-by-tone. This paper presents a unified
treatment of equalizer designs for multicarrier receivers, with an
emphasis on discrete multitone systems. It is shown that almost all
equalizer designs share a common mathematical framework based on
the maximization of a product of generalized Rayleigh quotients. This
framework is used to give an overview of existing designs (including an
extensive literature survey), to apply a unified notation, and to present
various common strategies to obtain a solution. Moreover, the unification
emphasizes the differences between the methods, enabling a
comparison of their advantages and disadvantages. In addition, 16
different equalizer structures and design procedures are compared in
terms of computational complexity and achievable bit rate using synthetic
and measured data.
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