Distributed Dynamic Spectrum Management for Digital Subscriber Lines

Yu-Sun LIU  Zeng-Jey SU  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.3   pp.491-498
Publication Date: 2007/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.3.491
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
dynamic spectrum management,  iterative water-filling,  asymmetric digital subscriber line (ADSL),  very-high bit-rate digital subscriber line (VDSL),  

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This paper investigates the dynamic spectrum management problem for digital subscriber lines. Two new distributed dynamic spectrum management algorithms, which improve upon the existing iterative water-filling algorithm, are proposed. Unlike the iterative water-filling algorithm, in which crosstalk interference is reduced by using adaptive power backoff, the new algorithms employ full power and mitigate crosstalk interference by shifting one user's spectrum away from the other's. Simulation results show that the new algorithms achieve significant performance gains over the iterative water-filling algorithm in mixed central office/remote terminal (CO/RT) deployment asymmetric digital subscriber line (ADSL) and upstream very-high bit-rate digital subscriber line (VDSL).