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Optimal multiuser spectrum balancing for digital subscriber lines

2006; IEEE Communications Society; Volume: 54; Issue: 5 Linguagem: Inglês

10.1109/tcomm.2006.873096

1558-0857

Raphael Cendrillon, Wei Yu, Marc Moonen, Jan Verlinden, Tom Bostoen,

Electromagnetic Compatibility and Noise Suppression

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.