| 摘要 |
A receiver including an RF tuner (303), an ADC (304), an OFDM demodulation unit (305), a transmission channel distortion estimating unit (308), a decision unit (309), and a control unit (313). The receiver always selects an optimum receiving condition in a manner adaptive to variations in the state of reception of a transmission signal and the characteristics of the receiver such as the modulation method of the transmission signal received. The RF tuner (303) tunes the received transmission signal to the OFDM signal of a desired wave and converts the same into intermediate frequencies. After the digital conversion in the ADC (304), the OFDM demodulation unit (305) obtains a demodulated-wave symbol signal of the orthogonal frequency signal. The transmission channel distortion estimating unit (308) extracts pilot signals (SP) and estimates distortion of the transmission channel. The decision unit (309) compares the distortion of the transmission channel estimated and a reference value stored in a memory (310), and outputs the result of comparison to the control unit (313), thereby switching antennas (301a, 301b) selectively. <IMAGE>
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