| 摘要 |
When a signal modulated by a multi-subcarrier modulation scheme is to be demodulated, an amplitude detection unit sequentially detects the amplitudes of a subcarrier-synthesized signal to accurately set a symbol discrimination timing for the modulated signal within a short period of time. A reference amplitude storage unit stores a reference amplitude at a portion corresponding to a predetermined reference symbol portion included in the received signal. A correlation calculation unit sequentially calculates correlation values between amplitudes sequentially detected by the amplitude detection unit and the reference amplitude. A discrimination timing determination unit determines a symbol discrimination timing on the basis of time representing a maximum value of the correlation values sequentially calculated by the correlation calculation unit. When the signal modulated by the multi-subcarrier modulation scheme is to be demodulated, a phase detection unit detects a phase theta of the subcarrier-synthesized signal at a predetermined portion to easily and properly correct the frequency offset of a carrier frequency.
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