Patent ID: 7206279
Filing Date: 2007-04-17
Classification: H04L

Abstract:
1. An apparatus for receiving an Orthogonal Frequency Division Multiplex (OFDM) modulated signal, the apparatus comprising: an A/D converter converting the received signal to a digital signal; a quadrature demodulator performing a quadrature detection of the digital signal converted by the A/D converter and converting the digital signal to a base-band signal of a time domain; a fast Fourier transform circuit transforming the base-band signal converted by the quadrature demodulator to a signal of a frequency domain by performing a fast Fourier transformation; an equalizer equalizing the signal of the frequency domain transformed by the fast Fourier transform circuit and obtaining demodulated data; an error correcting circuit performing an error correction and decoding the demodulated data obtained by the equalizer; an interference detector detecting a receiving quality for each predetermined frequency band from the demodulated data obtained by the equalizer; and a synchronous sequencer assigning weights to the base-band signal of the time domain outputted from the quadrature demodulator and the signal of the frequency domain outputted from the fast Fourier transform circuit, based on the receiving quality detected in the interference detector, and reproducing a timing synchronized signal and a clock pulse required for the demodulation of the receiving signals.