Patent ID: 7313189
Filing Date: 2007-12-25
Classification: H04L

Abstract:
1. A receiver which demodulates an Orthogonal Frequency Division Multiplexing symbol transmitted by an Orthogonal Frequency Division Multiplexing transmitter, comprising: a delay profile generation unit which generates a delay profile regarding a preceding wave and a delayed wave which are included in a received signal; a demodulation unit which demodulates said received signal so as to output a demodulated signal per sub-carrier; a hard-decision unit which makes a hard decision per sub-carrier on a signal point based on said demodulated signal so as to output a hard-decision signal; a replica generation unit which uses the hard-decision signal to generate a replica signal per sub-carrier; and an inter-carrier interference suppression unit which adds a difference between said hard-decision signal and said replica signal to said demodulated signal so as to suppress an inter-carrier interference; wherein said replica generation unit comprises: a time-domain received signal generation unit which inverse-Fourier transforms said hard-decision signal so as to generate a received signal in time domain; a signal component suppression unit which suppresses, by using a preceding symbol that is an already-demodulated OFDM symbol which precedes a target demodulating symbol that is a target OFDM symbol to be demodulated, a signal component of said preceding symbol which is included in said delayed wave; a modified received signal generation unit which adds, before said target demodulating symbol in said delayed wave, a portion of said received signal in said time domain so as to generate a modified received signal; and a replica signal generation unit which generates said replica signal by Fourier-transforming said modified received signal.