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Intra-Symbol Windowing for Egress Reduction in DMT Transmitters

  • Gert CuypersEmail author
  • Koen Vanbleu
  • Geert Ysebaert
  • Marc Moonen
Open Access
Research Article
Part of the following topical collections:
  1. Advanced Signal Processing for Digital Subscriber Lines

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).

Keywords

Fourier Fourier Transform Information Technology Frequency Band Quantum Information 

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Copyright information

© 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.

Authors and Affiliations

  • Gert Cuypers
    • 1
    Email author
  • Koen Vanbleu
    • 2
  • Geert Ysebaert
    • 3
  • Marc Moonen
    • 1
  1. 1.ESAT/SCD-SISTAKatholieke Universiteit LeuvenHeverleeBelgium
  2. 2.Broadcom CorporationMechelenBelgium
  3. 3.Alcatel BellAntwerpBelgium

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