A multi-user precoding scheme achieving crosstalk cancellation with application to DSL systems

This paper describes a precoding scheme capable of achieving crosstalk cancellation in scenarios involving communication from a "base station" to a number of geographically dispersed users. We illustrate that joint processing at the "base station" of the transmitted signals of all users can succeed in removing the otherwise resulting crosstalk. The method employed borrows from the concept of the Tomlinson-Harashima (1971, 1972) precoder which is often used for equalization against intersymbol interference (ISI). One possible application of the proposed technique is in digital subscriber line (DSL) systems, where far end crosstalk (FEXT) poses a severe transmission constraint. Simulation results show that significant improvements can be realized in such scenarios.