Patent ID: 7580453

Claim:
An adaptive equalizer receiving symbols to generate an equalizer output, comprising: a plurality of tap cells switching between a normal mode and an estimation mode each comprises: a delay unit, storing a tap data value; a coefficient updater, providing a coefficient updated recursively; and a calculating unit to generate a filter value from the tap data value and the coefficient; an integrator, coupled to the tap cells, collecting filter values output from those tap cells operating in normal mode to generate the equalizer output; and a controller, coupled to the tap coefficient updaters and integrator, controlling mode switching of each tap cell based on corresponding coefficients, and comprising: a counter, periodically delivering a trigger; a power meter, accumulating the power of received symbols during the period; and a mode switcher, receiving the coefficients from the coefficient updaters, and delivering mode signal #MODE to update the mode statuses of the tap cells periodically and respectively according to the coefficients.