EURASIP Journal on Applied Signal Processing 
Volume 2004 (2004), Issue 10, Pages 1520-1535
doi:10.1155/S1110865704309273

Partial Crosstalk Cancellation for Upstream VDSL

Raphael Cendrillon,1 Marc Moonen,1 George Ginis,2 Katleen Van Acker,3 Tom Bostoen,3 and Piet Vandaele3

 1Department of Electrical Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 10, Leuven-Heverlee, 3001, Belgium
2Texas Instruments, 2043 Samaritan Drive, San Jose 95124, CA, USA
3Alcatel Bell, Francis Wellesplein 1, Antwerp 2018, Belgium
Received 5 March 2003

Abstract

Crosstalk is a major problem in modern DSL systems such as VDSL. Many crosstalk cancellation techniques have been proposed to help mitigate crosstalk, but whilst they lead to impressive performance gains, their complexity grows with the square of the number of lines within a binder. In binder groups which can carry up to hundreds of lines, this complexity is outside the scope of current implementation. In this paper, we investigate partial crosstalk cancellation for upstream VDSL. The majority of the detrimental effects of crosstalk are typically limited to a small subset of lines and tones. Furthermore, significant crosstalk is often only seen from neighbouring pairs within the binder configuration. We present a number of algorithms which exploit these properties to reduce the complexity of crosstalk cancellation. These algorithms are shown to achieve the majority of the performance gains of full crosstalk cancellation with significantly reduced run-time complexity.