Demodulator including adaptive equalizer and demodulating method in digital communications

摘要

An apparatus comprising an unnecessary frequency component removal unit for removing unnecessary frequency components from a signal supplied from a detector, a unit for obtaining a measured value of delay spread of the signal supplied from the unnecessary frequency component removal unit, an adaptive equalizer for performing adaptive equalization on the signal supplied from the unnecessary frequency component removal unit, and a decoding unit for decoding an input signal, wherein the signal from the unnecessary frequency component removal unit is supplied to the decoding unit through the adaptive equalizer when the measured value of delay spread is larger than a predetermined value, whereas the signal from the unnecessary frequency component removal unit is supplied to the decoding unit without being passed through the adaptive equalizer when the measured value of delay spread is not larger than the predetermined value.