Patent ID: 8730785

Claim:
A non-transitory computer-readable storage medium, comprising computer instructions which, responsive to being executed by a processor, cause the processor to perform operations comprising: monitoring a plurality of modems in a digital subscriber line system for transitioning between a full power mode and another mode; determining crosstalk coupling characteristics between a plurality of lines of the digital subscriber line system connected to the plurality of modems based on changes in amplitude of transmitted signals, wherein the amplitude changes result from the transitioning between the full power mode and the other mode, wherein a change in a transmitted signal amplitude that results from multiple transitions between the full power and other modes of a modem of the plurality of modems is utilized as a probing signal for the determining of the crosstalk coupling characteristics between pairs of lines of the plurality of lines, wherein the crosstalk coupling characteristics are determined based on the change in the transmitted signal amplitude and are not determined based on monitoring changes to signal-to-noise ratio-vs-frequency information associated with other lines of the plurality of lines; and providing the crosstalk coupling characteristics to at least some of the plurality of modems for performance of pre-coding a transmitted signal, wherein the pre-coding is performed based on the crosstalk coupling characteristics and temporal characteristics associated with the other mode, wherein the pre-coding of the transmitted signal reduces effects of fluctuating crosstalk, and wherein the pre-coding utilizes a multiple-input multiple-output channel transfer matrix.