This article is part of the series Advanced Signal Processing for Digital Subscriber Lines.

Open Access Research Article

Intra-Symbol Windowing for Egress Reduction in DMT Transmitters

Gert Cuypers1*, Koen Vanbleu2, Geert Ysebaert3 and Marc Moonen1

Author Affiliations

1 ESAT/SCD-SISTA, Katholieke Universiteit Leuven, Heverlee 3001, Belgium

2 Broadcom Corporation, Mechelen 2800, Belgium

3 Alcatel Bell, Antwerp 2018, Belgium

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EURASIP Journal on Advances in Signal Processing 2006, 2006:070387  doi:10.1155/ASP/2006/70387


The electronic version of this article is the complete one and can be found online at: http://asp.eurasipjournals.com/content/2006/1/070387


Received: 28 December 2004
Revisions received: 20 July 2005
Accepted: 22 July 2005
Published: 27 March 2006

© 2006 Cuypers et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Discrete multitone (DMT) uses an inverse discrete Fourier transform (IDFT) to modulate data on the carriers. The high sidelobes of the IDFT filter bank used can lead to spurious emissions (egress) in unauthorized frequency bands. Applying a window function within the DMT symbol can alleviate this. However, window functions either require additional redundancy or will introduce distortions that are generally not easy to compensate for. In this paper, a special class of window functions is constructed that corresponds to a precoding at the transmitter. These do not require any additional redundancy and need only a modest amount of additional processing at the receiver. The results can be used to increase the spectral containment of DMT-based wired communications such as ADSL and VDSL (i.e., asymmetric, resp., very-high-bitrate digital subscriber loop).

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