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Rapid acquisition of accurate crosstalk estimates is a core requirement for effective precoding in Digital Subscriber Line (DSL) systems. It is shown that Signal-to-Noise Ratio (SNR) reports provided by Customer Premises Equipment (CPE) can be used to perform this task by "Tuning" the precoder, i.e., iterating alternate steps of estimation and precoder adaptation. Such an approach has the advantage that it can be applied to legacy CPEs. Estimation algorithms are designed using techniques from stochastic control.
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