| 摘要 |
A heterodyne receiver converts a received high frequency signal into an intermediate frequency signal and demodulates a base band signal from a intermediate frequency signal. Low-pass filters cut the high frequency components of the baseband signal, and AD converters sample the output signal of those low-pass filters, convert them to a digital signal and input them to a Fourier transformer. An intermediate frequency determining part determines the intermediate frequency so that the spectrum when the intermediate frequency signal being inputted to the AD converter is under-sampled appears within a subcarrier band not used in OFDM transmission.
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