| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved OFDM reception circuit capable of preventing the clipping of a baseband signal being input into an AD converter, and demodulating a DC component without losing original information of a low frequency component. SOLUTION: The OFDM reception circuit of direct conversion includes a DC offset amount estimation circuit 14 for estimating a DC offset amount by extracting a DC component from the result of Fast Fourier Transform by means of an FFT circuit 13, a DA converter 19 for converting the estimated DC offset amount to an analog value, and subtractors 21, 22 for subtracting the estimated DC offset amount of analog value from the output of a mixer 5. Because of subtracting the estimated DC offset amount of analog value from the mixer output, a function of compensating the DC offset circuit-generated in the receiver circuit is provided. COPYRIGHT: (C)2007,JPO&INPIT
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