Spectrum Management for Digital Subscriber Lines

The performance of the digital subscriber lines (DSL) systems is severely constrained by the crosstalk due to the electromagnetic coupling among the multiple lines in a binder. Static spectrum management (SSM), the traditional way of ensuring spectral management, employs spectral masks which can be overly conservative and lead to poor performance. Dynamic spectrum management (DSM), a new paradigm overcomes this problem by designing an adaptive spectra of each modem to match specific topology of the network. In this paper we present a centralized spectrum management (CSM) algorithm which shows significant performance gains over DSM iterative waterfilling algorithm when applied to the very high bit rate digital subscriber lines (VDSL) upstream transmission.