Optimal multiuser spectrum management for digital subscriber lines
Venue
IEEE Transactions on Communications, vol. 54 (2006), pp. 922-933
Publication Year
2006
Authors
Raphael Cendrillon, Wei Yu, Marc Moonen
BibTeX
Abstract
Crosstalk is a major issue in modern digital subscriber line (DSL) systems such as
ADSL and VDSL. Static spectrum management, which is the traditional way of ensuring
spectral compatibility, employs spectral masks that can be overly conservative and
lead to poor performance. This paper presents a centralized algorithm for optimal
spectrum balancing in DSL. The algorithm uses the dual decomposition method to
optimize spectra in an efficient and computationally tractable way. The algorithm
shows significant performance gains over existing dynamics spectrum management
(DSM) techniques, e.g., in one of the cases studied, the proposed centralized
algorithm leads to a factor-of-four increase in data rate over the distributed DSM
algorithm iterative waterfilling.
