. "The demodulator 220 demodulates a digital OFDM signal output from the RF module 210 (e.g., received in a format such as QAM (Quadrature Amplitude Modulation), BPSK (Binary Phase-Shift Keying), QPSK (Quadrature Phase-Shift Keying), etc.) to generate an I-signal and a Q-signal, which are complex signals." . . .