To achieve carrier frequency synchronization with short lead-in time, and at the same time to eliminate the influence of phase fluctuation common to an entire sub carrier due to the phase noise of a tuner or the like in an OFDM signal demodulation device.
A differential detection circuit 26 allows the output of an FFT circuit 25 to be differentially detected between symbols, a correlation calculation circuit 27 calculates the correlation value between differential detection output and the arrangement information of the sub carrier for pilot transmission, a wideband carrier frequency error calculation circuit 28 calculates a frequency error in sub carrier interval units from the peak position of the correlation value, and a carrier frequency correction circuit 23 uses the frequency error for correcting a carrier frequency. Also, a phase averaging circuit 29 averages the phase of the differential detection output corresponding to the sub carrier for pilot transmission, and a phase fluctuation correction circuit 30 uses the averaged phase for correcting the phase fluctuation common to entire sub carriers.
KIMURA TOMOHIRO
KAGEYAMA TEIJI
HARADA YASUO
KISODA AKIRA
SOGA SHIGERU
SAKASHITA SEIJI
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
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