Patent ID: 6034564
Filing Date: 2000-03-07
Classification: H04L

Abstract:
A demodulator for demodulating an input signal using quasi-synchronous detection, the demodulator comprising:a quasi-synchronous detector to detect a modulated quadrature input signal using an oscillated signal of a fixed frequency to thereby output a detected quadrature signal;an equalizer to equalize a quadrature channel signal which is a digital signal converted from the detected quadrature signal output from said quasi-synchronous detector to thereby output an equalized quadrature channel signal;a phase rotator to rotate the phase of the equalized quadrature channel signal output from said equalizer; andan equalization controller unit to generate a tap factor for said equalizer from the quadrature channel signal equalized by said equalizer, using a signal having a substantially same phase as input-output signals of the equalizer.