Crosstalk cancellation in digital subscriber lines using multidimensional coordination

Digital subscriber lines (DSL) technology provides a transport of high-bit-rate digital information over the public telephone lines. Recently, a new technique has been proposed to increase the overall data rate by coordinating all the wires in the same DSL cable. However, this coordination method cannot be applied when the cable lines are used for different types of xDSL services. This paper proposes a dimensional decision-feedback equalizer (M-D DFE) and precoding method that can simultaneously coordinate the lines in the time and user domain. A modified decision-feedback substitution is proposed by applying a generalized DFE (G-DFE) scheme into the two dimensional domain to increase the cable capacity. The performance of the proposed scheme is verified by computer simulation.