Patent ID: 8451882
Filing Date: 2013-05-28
Classification: H04B,H04L

Abstract:
1. An OFDM modulation/demodulation method in a transmission system that transmits data from a transmission source to a transmitting destination through OFDM modulation/demodulation, comprising: an extension step of extending, by the transmission source, a symbol period by adding a copy symbol generated by copying an OFDM-modulated data symbol to an end of the data symbol, and adding guard intervals in the OFDM modulation to a front of the data symbol and a rear of the copy symbol; a transmission step of transmitting, by the transmission source, an OFDM-modulated symbol that includes the extended symbol period to the transmitting destination; a demodulation performance step of receiving, by the transmitting destination, the OFDM-modulated symbol from the transmission source and performing OFDM demodulation of the received OFDM-modulated symbol from two time points with an interval corresponding to a length that is obtained by adding a symbol length of the data symbol in the OFDM modulation and a guard time of one of the guard intervals in the OFDM modulation; and a selection step of selecting, by the transmitting destination, a demodulation result of the OFDM demodulation to be adopted on the basis of demodulation results of the OFDM demodulation from the two time points.