OFDM RECEPTION DEVICE, OFDM TRANSMISSION DEVICE, AND OFDM COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To manage improvement in both information signal transmission efficiency and demodulation signal error ratio characteristics, in or orthogonal frequency division multiplexing(OFDM) system applying multicast. SOLUTION: An OFDM communication device according to this invention comprises a reception means which generates demodulation signals for a plurality of OFDM reception devices by Fourier transformation for OFDM signals transmitted by an OFDM transmission device, a generation means which superimposes a predetermined signal indicating a re-send request of the OFDM signals onto a subcarrier unique to the OFDM signals and generates OFDM signals to be re-sent, when an error occurs in the generated demodulation signals, and a transmission means which transmits the generated OFDM signals to be re-sent to the OFDM transmission device at the same time with the transmission time of OFDM signals to be re-sent by the plurality of OFDM reception devices.