| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an AGC control technique that rapidly reduces control amplitude error of received AGC with a simplified method. <P>SOLUTION: An OFDM system wireless transceiver 1 performs AGC control using a received AGC table indicating a relationship between RSSI voltage of a receiver circuit 5 and an AGC gain. AGC gain offset to RSSI voltage in the received AGC table is corrected based on the amplitude of a signal yielded by demodulating in an orthogonal demodulator 50 a reference signal output from a reference signal output part 10 and the RSSI voltage detected by an RSSI voltage detector 20. At this point, when the amplitude evaluated by square averaging an I component and Q component of the reference signal yielded by demodulation in the DC demodulator 50 falls within a predetermined range, the amplitude of the orthogonal demodulation signal and the RSSI voltage are used for correction of the received AGC table. Otherwise, the amplitude of the orthogonal demodulation signal and the RSSI voltage are not used for correction of the received AGC table. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
