Patent ID: 8724800

Claim:
A method in a Vector Control Entity associated with a plurality of digital subscriber lines forming a vectoring group, the method comprising: for a first line i in the vectoring group: calculating a respective crosstalk effect indicator, CEI ij , for the crosstalk from each line j of a plurality J of other lines in the vectoring group to a plurality of tones S i of line i, based on the strength of crosstalk from each line j to line i, thus providing one CEI i , associated with the plurality S i of tones, per line j, and allocating partial-vectoring resources to cancellation of crosstalk, based on the calculated CEIs, wherein the CEI is calculated as: cei ij = ∑ k ∈ S tone ⁢ log ⁢ ⁢ PSD j k PSD i k ·  h _ ij k  2 wherein i is the line subjected to crosstalk; wherein j is a line within the group J, possibly causing crosstalk to line i, where j ={1, . . . , i−1, . . . , N}, where N is the number of lines in the vectoring group; wherein k is a tone in the plurality S i of tones, where k={1, . . . , K}, where K is the number of tones in S i ; wherein PSD is a power spectral density of the respective ones of line i and line j and wherein h ij k are the normalized crosstalk channel coefficients from line j to line i at tone k, which can be estimated from the error samples fed back from customer premises equipments (CPEs) in downstream and the received signal, or error samples, at Digital Subscriber Line Access Multiplexer (DSLAM) receivers.