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EURASIP Journal on Advances in Signal Processing
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Selective Iterative Waterfilling for Digital Subscriber Lines

EURASIP Journal on Advances in Signal Processing volume 2007, Article number: 059068 (2007) Cite this article

Abstract

This paper presents a high-performance, low-complexity, quasi-distributed dynamic spectrum management (DSM) algorithm suitable for DSL systems. We analytically demonstrate that the rate degradation of the distributed iterative waterfilling (IW) algorithm in near-far scenarios is caused by the insufficient utilization of all available frequency and power resources due to its nature of noncooperative game theoretic formulation. Inspired by this observation, we propose the selective IW (SIW) algorithm that can considerably alleviate the performance degradation of IW by applying IW selectively to different groups of users over different frequency bands so that all the available resources can be fully utilized. For users, the proposed SIW algorithm needs at most times the complexity of the IW algorithm, and is much simpler than the centralized optimal spectrum balancing (OSB), while it can offer a rate performance much better than that of the IW and close to the maximum possible rate region computed by the OSB in realistic near-far DSL scenarios. Furthermore, its predominantly distributed structure makes it suitable for DSL implementation.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montréal, Québec, H3A 2A7, Canada

    Yang Xu, Tho Le-Ngoc & Saswat Panigrahi

Authors
  1. Yang Xu
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  2. Tho Le-Ngoc
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  3. Saswat Panigrahi
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Correspondence to Yang Xu.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://doi.org/creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Xu, Y., Le-Ngoc, T. & Panigrahi, S. Selective Iterative Waterfilling for Digital Subscriber Lines. EURASIP J. Adv. Signal Process. 2007, 059068 (2007). https://doi.org/10.1155/2007/59068

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