Training based crosstalk cancellation with updating implementation

Crosstalk is the major limiting factor affecting the achieve rate of VDSL/VDSL2 system. Several crosstalk precoder and canceller methods have been proposed respectively for downstream and upstream transmission, which are based on the assumption that we known the crosstalk channel matrix on each tone. In practice, however, these matrices are estimated from training data. Without estimating the crosstalk channel matrix, a novel crosstalk cancellation algorithm is proposed in this paper. In this algorithm, the crosstalk cancellation filter is derived from the transmitted and received signals. Furthermore, an updating algorithm is derived for reducing the complexity of the proposed algorithm. Computer simulation results based on measured channels verified the analysis.