A new penalty based algorithm for multi-user Spectrum Balancing in xDSL networks

Abstract

This work presents a new algorithm for Dynamic Spectrum Management (DSM) in Digital Subscriber Lines. Previous approaches have achieved high performance by attempting to directly solve or approximate the multiuser spectrum optimisation problem. These methods suffer from a high or intractable computational complexity for even a moderate number of DSL lines. A new method is proposed which is a heuristic extension of the single user greedy algorithm applied to the multi-user case. The new algorithm incorporates a novel cost function that penalises crosstalk as well as considering the usefulness of a tone. Simulation results are presented and it is shown that the new method achieves results within a few percent of the optimal solution for a range of scenarios.