A communication device on the transmission side creates a transmission symbol by inverse Fourier transform of a signal subjected to BPSK modulation, converts the transmission symbol to half symbols, transmits the half symbols. A communication device on the reception side separates the even subcarrier from the odd subcarrier, demodulates only the reception symbol of the half symbols of the even subcarrier, removes the symbol component of the even subcarrier from the reception symbol, and demodulates only the reception symbol of the odd subcarrier. |