Patent ID: 6907064
Filing Date: 2005-06-14
Classification: H03H,H04L

Abstract:
1. A waveform equalization controller comprising: a waveform equalizer operable to reduce a transmission line distortion of an input signal based on a LMS algorithm, and to output an output signal, wherein said waveform equalization controller is operable to control updating of a tap coefficient of a filter which is included in said waveform equalizer; an error estimation unit operable to estimate an error of the output signal outputted from said waveform equalizer based on the output signal, and to output an error signal; a step size decision unit operable to receive the error signal outputted from said error estimation unit and a step size upper limit value and a step size lower limit value, which are an upper limit value and a lower limit value of a possible step size as a step for updating the tap coefficient, respectively, to adaptively generate a step size corresponding to the error signal in a range of the step size upper limit value or smaller and the step size lower limit value or larger, and to output the generated step size; and a coefficient updating calculation unit operable to calculate a tap coefficient amount based on the error signal outputted from said error estimation unit, the generated step size outputted from said step size decision unit, and a data to be used for updating the tap coefficient; wherein said step size decision unit comprises: