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SCALE: A Low-Complexity Distributed Protocol for Spectrum Balancing in Multiuser DSL Networks

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2 Author(s)
Papandriopoulos, J. ; Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Parkville, VIC, Australia ; Evans, J.S.

Dynamic spectrum management of digital subscriber lines (DSLs) has the potential to dramatically increase the capacity of the aging last-mile copper access network. This paper takes an important step toward fulfilling this potential through power spectrum balancing. We derive a novel algorithm called SCALE, that provides a significant performance improvement over the existing iterative water-filling (IWF) algorithm in multiuser DSL networks, doing so with comparable low complexity. The algorithm is easily distributed through measurement and limited message passing with the use of a spectrum management center. We outline how overhead can be managed, and show that in the limit of zero message-passing, performance reduces to IWF.

Published in:

Information Theory, IEEE Transactions on  (Volume:55 ,  Issue: 8 )