A study on multiuser DSL channel capacity with crosstalk environment

Abstract

This paper describes a new approach to enhance digital subscriber line (DSL) (emphasizing DMT-ADSL) throughput with multiuser channel model. We have studied the spectral distribution of DSL interference and the capacity of a twisted pair channel. The current single user DSL approach ignores the structure of the crosstalk interference and the underlying sources of the crosstalk environment. Our study has shown a significant improvement on multiuser DSL channel capacity, while treating the crosstalk as the sum of filtered coupling of other DSL signals onto the desired DSL receiver. With this the DSL deployment restrictions may be relaxed and the DSL services can also extend the loop reach and/or increase the throughput at any given loop length. This study also has the potential implication and benefit for DSL spectral management.