Patent ID: 6052413
Filing Date: 2000-04-18
Classification: H03H

Abstract:
A waveform equalization coefficient generator, which is utilized in a digital equalizer for equalizing a multivalued quadrature amplitude modulation (QAM) modulated signal, for generating equalization coefficients for respective taps of digital filters which perform signal waveform equalization, said waveform equalization coefficient generator comprising:(a) an error data generation unit for generating error data necessary to update an equalization coefficient to a received signal; and(b) a complex arithmetic unit for performing, based on said received signal and error data output from said error data generation unit, updating of said equalization coefficient by means of separate updating of real part data and imaginary part data of said equalization coefficient;wherein:said error data generation unit carries out generation of said error data by means of separate generation of I-axis direction error data and Q-axis direction error data; andsaid complex arithmetic unit adaptively selects between real part data and imaginary part data of said received signal and adaptively selects between said I-axis direction error data and said Q-axis direction error data, to perform arithmetic operations for updating said real part data and imaginary part data of said equalization coefficient by means of a common arithmetic unit.