Gain adaptation for downstream vectoring systems

摘要

The present invention relates to a method for controlling communications over a plurality of subscriber lines (L1 .. LN), the communications making use of communication signals that are jointly processed through a precoder (120) for crosstalk pre-compensation. In accordance with an embodiment of the invention, the method comprises detecting an update event whereupon the precoder needs to be updated, sending signal adjustment information to a receiver (xTU-Ri) remotely coupled to a subscriber line (Li) out of the plurality of subscriber lines indicative of a signal compensation factor (³i) to be applied to a receive communication signal to compensate for a channel bias caused by the scheduled precoder update, and time-coordinating the precoder update with the enforcement of the signal compensation factor at the receiver. The present invention also relates to corresponding first and second communication controllers forming part of an access node and a subscriber device respectively.