Open Access

Intra-Symbol Windowing for Egress Reduction in DMT Transmitters

EURASIP Journal on Advances in Signal Processing20062006:070387

https://doi.org/10.1155/ASP/2006/70387

Received: 28 December 2004

Accepted: 22 July 2005

Published: 27 March 2006

Abstract

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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Authors’ Affiliations

(1)
ESAT/SCD-SISTA, Katholieke Universiteit Leuven
(2)
Broadcom Corporation
(3)
Alcatel Bell

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Copyright

© Gert Cuypers et al. 2006

This article is published under license to BioMed Central Ltd. 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.