Patent ID: 7817745
Filing Date: 2010-10-19
Classification: H04L

Abstract:
1. A method for compensating crosstalk by adaptively precoding data for transmission over a channel in a Digital Subscriber Line (DSL) system, the method comprising: providing first encoded data of a first user as a first input to a multi-user precoder; providing second encoded data of a second user as a second input to the multi-user precoder; collecting over time, via a controller, channel information including channel changes and noise changes; collecting over time, via the controller, information about users in the DSL system including addition of a new user and dropping off an old user; adaptively precoding via joint processing on the first and the second encoded data via an adaptive precoding matrix of the multi-user precoder to generate first and second precoded data from the first and second encoded data respectively, the adaptive precoding based on the channel information and on the information about the users in the DSL system, wherein the controller is configured to adapt the adaptive precoding matrix by matching channel changes observed over time, wherein the controller is further configured to adapt the adaptive precoding matrix to changes in a noise spatial correlation of the channel, and wherein the controller is further configured to update the adaptive precoding matrix in response to the addition of the new user in the DSL system or in response to the dropping off of the old user from the DSL system; and transmitting the first precoded data and the second precoded data over the channel.