A centrally managed dynamic spectrum management algorithm for digital subscriber line systems

Abstract

This paper presents a centrally managed scheme of combined crosstalk cancellation and multiuser power control for minimizing crosstalk degradation effects in multiuser digital subscriber line (DSL) systems. Exploiting the frequency selective nature of the heavily unbalanced crosstalk channel, the crosstalk cancellation is carried out on the selected tones in order to reduce complexity. Multiuser power control is implemented centrally through Spectrum Management Center (SMC) that knows the channel gains and noise power spectral density (PSD) for all users. Simulation results show that the proposed algorithm considerably enlarges the data rate region when applied to very high speed digital subscriber lines (VDSL) upstream transmission. © 2008 Springer-Verlag.