| 摘要 |
A demodulator is provided which includes a complex conjugate signal generator (31) to generate a complex conjugate signal of an OFDM time domain signal (complex signal including an I channel signal and Q channel signal) supplied from an orthogonal demodulation circuit (15), a delaying unit (32) to delay, by an integral multiple of a predetermined period 1H or 2H, the complex conjugate signal supplied from the complex conjugate signal generator (31), a complex multiplier (33) to make complex multiplication on the basis of the complex signal generated by the orthogonal demodulation circuit (15) and complex conjugate signal delayed by the integral multiple of the predetermined period by the delay unit (32), and a determining unit (34) to determine whether an interference wave is included in the modulated signal by making a comparison between the complex multiplication value resulted from the complex multiplication made by the complex multiplier (33) and an arbitrary threshold. |
