Decision feedback equalizer and method for updating tap coefficients thereof

A method for updating a decision feedback equalizer comprising a first equalizer for reducing channel interference noise of an input signal, a slicer for detecting data in a signal obtained by subtracting a feedback signal from an output signal of said first equalizer, and a second equalizer which generates a feedback signal reducing the remaining interference noise using an output signal of said slicer as an input signal, said method comprising the steps of:

• conducting a blind initialization updating step, wherein said blind initialization updating step comprises the steps of:
• freezing an updating operation of said second equalizer for a predetermined first time period when said first equalizer is updated;
• and
• freezing an updating operation of said first equalizer for a predetermined second time period when said second equalizer is updated;
• and
• conducting a steady state updating step, wherein said steady state updating step comprises:
• freezing the updating operation of said second equalizer for a predetermined third time period when said first equalizer is updated;
• and
• freezing the updating operation of said first equalizer for a predetermined fourth time period when said second equalizer is updated.

A decision feedback equalizer, comprising:

• first means for reducing channel interference noise in an input signal;
• second means for generating a feedback signal for reducing remaining interference noise;
• and
• an update controller that controls an updating operation of said first and said second means so as to freeze the updating operation of said second means when said first means is updated and to freeze the updating operation of said first means when said second means is updated.