Open AccessTurbo-per-Tone Equalization for ADSL Systems
Author(s) -
Hilde Vanhaute,
Marc Moonen
Publication year - 2005
Publication title -
eurasip journal on advances in signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 88
eISSN - 1687-6180
pISSN - 1687-6172
DOI - 10.1155/asp.2005.852
Subject(s) - equalization (audio) , asymmetric digital subscriber line , turbo , turbo equalizer , computer science , tone (literature) , minimum mean square error , algorithm , digital subscriber line , decoding methods , telecommunications , mathematics , estimator , statistics , engineering , block code , art , literature , error floor , automotive engineering
We study the equalization procedure in discrete multitone (DMT)-based systems, in particular, in DMT-based ADSL systems. Traditionally, equalization is performed in the time domain by means of a channel shortening filter. Shifting the equalization operations to the frequency domain, as is done in per-tone equalization, increases the achieved bitrate by 5–10%. We show that the application of the turbo principle to per-tone equalization can provide significant additional gains. In the proposed receiver structure, referred to as a “turbo-per-tone equalization†structure, equalization and decoding are performed in an iterative fashion. Equalization is done by means of a linear minimum mean squared error (MMSE) equalizer, using a priori information. We give a description of an efficient implementation of such an equalizer in the per-tone structure. Simulations show that we obtain a bitrate increase of 12–16% compared to the original per-tone equalization-based receiver structure
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