OFDM COMMUNICATION DEVICE AND GUARD INTERVAL LENGTH DECISION METHOD

摘要

It is possible to control length of a guard interval so as to obtain a minimum necessary SINR even when a background noise is present. An OFDM communication device (10) includes: a correlation calculation unit (14) for calculating a correlation between a series of symbols received and a held signal having the same waveform as a known signal contained in the series of symbols; a desired signal power acquisition unit (19) for acquiring a desired signal power according to the calculation result; a background noise power acquisition unit (22) for acquiring a background noise power indicating the difference between reception power of each symbol and the desired signal power; and a GI length decision/instruction unit (23) for deciding the length of the guard interval in accordance with the background noise and instructing the transmission device to transmit symbols at the decided guard interval length.