OFDM receiver and its automatic gain control circuit

Details OFDM receiver and its automatic gain control circuit OFDM receiver and its automatic gain control circuit

2007-04-19

2011-10-25

Ha, Dac (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C455S232100

Reexamination Certificate

active

08045659

ABSTRACT:
An OFDM receiver includes: a variable gain amplifier controlling a signal level of an intermediate frequency signal that is obtained from a reception signal by frequency-conversion; and an automatic gain controller controlling a gain of the variable gain amplifier means. The automatic gain controller includes: a clip detector comparing a clip number threshold value with a detected number of transient clips in which a signal level of the intermediate frequency signal exceeds a parameter clip level, so as to detect a period where the detected number exceeds the clip number threshold value; an accumulator accumulating a detection output of the clip detector; and a target value decision circuit to which an accumulation output of the accumulator is supplied.

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