Access node of the communication system includes a plurality of transmitters adapted to communicate with at least one receiver. Estimates simultaneously the channel coefficients between a transmitter and a receiver of multiple access nodes, at least one that is sent to the receiver by at least one of a plurality of transmitters by using the estimated channel coefficients It is operable to control the data signal of Tsu. In the process of simultaneously estimating the channel coefficients are generated based on a combination of separate frequency deployment a selected one of the frequency expansion of different common probing sequence, each access node, probing signal a plurality of separate I will send. The access node may comprise at least a portion of the central office at least one of the DSL communication system.
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