ADAPTIVE PRECODING SYSTEM AND METHOD TO COMPENSATE FOR CHANGES IN A COMMUNICATIONS CHANNEL

摘要

An adaptive precoding system (120) is implemented within a data communications system in order to precode data to track changes in a communications channel. The adaptive precoding system (120) initializes a set of precoder values within a precoder filter (94) of a transmitter during an initialization phase. The precoder filter (94) is used to create a precoding signal that is combined with a transmission data signal in order to compensate for distortions on a communication channnel. During a communications phase, a decision feedback equalizer (64) generates equalizer coefficients that correspond to changes in communication channel. The equalizer coefficients are periodically transmitted to a converter (130) within the transmitter over a secondary channel (119). The converter (130) determines a new set of precoder values that compensate for the changes in communication channel and slowly updates the values in the precoder filter (94) until they match the new set of precoder values. While the precoder values are being updated, the decision feedback equalizer updates the equalizer coefficient values to reflect the improvements realized by updating the precoder values.