RECEIVING APPARATUS USING OFDM TRANSMISSION METHOD, CONCERNED WITH RECEIVING A TRANSMITTED SIGNAL BY ADDING INTERVAL TO A SIGNAL GAINED BY INVERSE FAST FOURIER TRANSFORM

摘要

PURPOSE: A receiving apparatus using an OFDM transmission method is provided to reduce ISI(Inter-Symbol Interference) and ICI(Inter-Carrier Interference) due to a delayed wave exceeding a guard interval by improving the receiving apparatus. CONSTITUTION: A receiver is used for receiving a signal having the length of a guard interval of a known symbol larger than the length of a guard interval of a data symbol. A delay-profile measurement unit(103) measures a delay profile of a delayed wave greater than the guard interval of the data symbol by calculating correlation between the received signal and a known signal. An ISI replica generator(104) is used for detecting a delay-time part and generating an ISI replica according to the ISI part. A subtractor(102) is used for subtracting the ISI replica from a receive signal. A data demodulator is used for demodulating data by performing an FFT process for an output of subtractor.