| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of performing stable AGC control, even in a reception environment having high-speed level variation. SOLUTION: An AGC control voltage 109 is generated in an OFDM processing apparatus 101. That means, an inputted IF signal is converted into a DC voltage in a detection rectifier 110, the converted voltage is compared with a reference voltage 112 in a gain control unit 111, and the AGC control voltage 109 is generated based on a voltage difference. A fading determining section 10 determines whether or not a reception radio wave has a high-speed level variation due to multi-path fading, and an AGC time constant of the gain control unit 111 is outputted to a time constant control unit 11 to be changed. In this way, if an unfollowable high-speed level variation exists because of the influence of multi-path fading, the AGC time constant is increased to reduce deterioration of reception performance due to unstable AGC control. COPYRIGHT: (C)2008,JPO&INPIT
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