Patent ID: 8165192
Filing Date: 2012-04-24
Classification: H04B,H04L

Abstract:
1. A waveform equalizer for performing waveform equalization of an input signal and outputting a waveform equalization result as an output signal, comprising: an FIR (finite impulse response) filter for performing a convolution operation between the input signal and a plurality of tap coefficients; an IIR (infinite impulse response) filter for performing a convolution operation between the output signal and a plurality of tap coefficients; an adding section for adding an operation result of the FIR filter and an operation result of the IIR filter and outputting an addition result as the output signal; an error detecting section for detecting an error of the output signal and outputting the detected error; and a tap coefficient updating section for updating respective tap coefficients of the FIR filter and the IIR filter based on the error, wherein the tap coefficient updating section sets a step size for updating the tap coefficients of the FIR filter to a value smaller than a step size for updating the tap coefficients of the IIR filter during a period from start of operation of the waveform equalizer until a predetermined condition is satisfied.