| 摘要 |
PROBLEM TO BE SOLVED: To provide an OFDM radio receiver which prevents reception quality of a main signal from being deteriorated even if a local signal of an intermediate frequency leaks from a low-pass filter. SOLUTION: A heterodyne receiving unit converts a received high-frequency signal into an intermediate frequency signal and demodulates a baseband signal from the intermediate frequency signal. A low-pass filter (57a, 57b) cuts a high-frequency component of the baseband signal, and an A/D converter (58a, 58b) samples an output signal of the low-pass filter, converts it into a digital signal and inputs it to a Fourier transform unit. An intermediate frequency determination unit (60) determines an intermediate frequency so that the spectrum at the time of under sampling the intermediate frequency signal inputted to the A/D converter appears in a sub-carrier band that is not used in OFDM transmission. COPYRIGHT: (C)2006,JPO&NCIPI
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