Abstract
An overview of alien crosstalk cancellation for DSL systems with multiple pairs is here presented. It is shown that when a common crosstalk source affects the receivers of multiple pairs, the noise exhibits a certain correlation among the pairs. In a DMT system, the frequency-domain noise samples are most strongly correlated between pairs when they correspond to the same tone. Thus, noise decorrelation algorithms applied independently for each tone can provide significant performance enhancements. Three possible methods are described for noise decorrelation, one is suitable for two-sided coordination and two are suited for receiver coordination among the pairs. It is theoretically proven that the data-rate performance of these three methods is identical from the perspective of the sum rate over all pairs. Simulation results corresponding to an ADSL2+ two-pair system with a T1 disturber are presented to illustrate the noise correlation property and to indicate the potential performance benefits.
Highlights
Digital subscriber line (DSL) transmission is typically constrained by crosstalk interference
This paper presents the theory of alien crosstalk cancellation, and gives an overview of such multiple-input multiple-output (MIMO) methods
This paper gave an overview of the subject of alien crosstalk cancellation for DSL systems employing multiple pairs
Summary
Digital subscriber line (DSL) transmission is typically constrained by crosstalk interference. This paper gives an overview of a specific class of vectoring methods that aim to suppress interference arising from crosstalk sources that lie outside the vectored system The effect of such sources is typically referred to as alien or out-of-domain crosstalk. Such methods have been presented and discussed within DSL standardization bodies such as the Network Access Interfaces (NAI) Committee of the Alliance for Telecommunications Industry Solutions (ATIS) These discussions have partly been motivated by the application of DSL bonding, where multiple pairs are used to transport a single data stream, and which offers the possibility to implement two-sided coordination. The superscripts T and ∗ denote the transpose and conjugate transpose operations correspondingly
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