EURASIP Journal on Applied Signal Processing 
Volume 2006 (2006), Article ID 67686, 8 pages
doi:10.1155/ASP/2006/67686

ADSL Transceivers Applying DSM and Their Nonstationary Noise Robustness

Etienne Van den Bogaert,1 Tom Bostoen,2 Jan Verlinden,2 Raphael Cendrillon,3 and Marc Moonen4

 1Research & Innovation Department of Alcatel, Francis Wellesplein 1, Antwerpen 2018, Belgium
2Access Networks Division of Alcatel, Francis Wellesplein 1, Antwerpen 2018, Belgium
3School of Information Technology & Electrical Engineering, University of Queensland, Brisbane 4072, QLD, Australia
4Department of Electrical Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 10, Leuven-Heverlee 3001, Belgium
Received 10 December 2004; Revised 10 May 2005; Accepted 18 May 2005

Abstract

Dynamic spectrum management (DSM) comprises a new set of techniques for multiuser power allocation and/or detection in digital subscriber line (DSL) networks. At the Alcatel Research and Innovation Labs, we have recently developed a DSM test bed, which allows the performance of DSM algorithms to be evaluated in practice. With this test bed, we have evaluated the performance of a DSM level-1 algorithm known as iterative water-filling in an ADSL scenario. This paper describes the results of, on the one hand, the performance gains achieved with iterative water-filling, and, on the other hand, the nonstationary noise robustness of DSM-enabled ADSL modems. It will be shown that DSM trades off nonstationary noise robustness for performance improvements. A new bit swap procedure is then introduced to increase the noise robustness when applying DSM.