Automatic gain control circuit and automatic gain control...

Details Automatic gain control circuit and automatic gain control... Automatic gain control circuit and automatic gain control...

2006-10-03

2006-10-03

Fan, Chieh M. (Department: 2634)

Pulse or digital communications

Receivers

Automatic gain control

Reexamination Certificate

active

07116733

ABSTRACT:
In an automatic gain control circuit of a demodulating circuit, power values of pieces of symbol information I and Q of in-phase components and quadrature components of a modulated signal are calculated, a power difference between each power value and an ideal power value is detected, and an AGC control signal is produced to adjust a gain of the modulated signal according to the AGC control signal in a demodulating system including the demodulating circuit. Therefore, when an amount of noise included in the modulated signal is low, an average value of the power differences is reduced to zero, and the modulated signal can be correctly demodulated to a demodulated signal. To correctly demodulate the modulated signal including a large amount of noise, after the conversion of the AGC control signal, a sweep counter value is added to the AGC control signal so as to minimize a bit error rate of the demodulated signal. Thereafter, the ideal power value is corrected to reduce the average value of the power differences to zero even though the AGC control signal is corrected.

REFERENCES:
patent: 5455685 (1995-10-01), Mori
patent: 6268767 (2001-07-01), Maalej et al.
patent: 6459458 (2002-10-01), Balaban
patent: 6668027 (2003-12-01), Scarpa
patent: 6721549 (2004-04-01), Lee et al.
patent: 6744830 (2004-06-01), Furukawa et al.
patent: 2001/0003536 (2001-06-01), Kurihara
patent: 5-129862 (1993-05-01), None

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