Blind automatic gain control system for receivers and modems

Details Blind automatic gain control system for receivers and modems Blind automatic gain control system for receivers and modems

1998-01-20

2000-11-14

Chin, Stephen

Pulse or digital communications

Receivers

Automatic gain control

375371, 375260, 341139, H04L 2708

Patent

active

061480460

ABSTRACT:
The present invention is an apparatus and method for blind automatic gain control in a digital communications device. The present invention includes a maximum error detector (MED) (142) which includes a gain error evaluator (GEE) (144) and a maximum value detector (MVD) (146). Also included is a decision gain adjustor (DGA) (148) which includes a gain value controller (GVD) (150) and an initial value buffer (IVB) (152). The GEE (144) is operable to generate a gain error signal in accordance with an input baseband signal (x) and a sliced version of the input baseband signal (x'). The MVD (146) is operable to generate a renew signal in accordance with the sliced version of the input baseband signal (x') and a first predetermined reference value. The GVD (150) is operable to converge the gain error signal (.DELTA.x) in a first state using a first convergence technique and to converge the resultant signal in a second state using a second convergence technique. The IVB (152) is also used in generating the resultant output gain value signal from the converged gain error signal.

REFERENCES:
patent: 4355402 (1982-10-01), Kromer, III et al.
patent: 4683578 (1987-07-01), Betts et al.
patent: 5796358 (1998-08-01), Shih et al.
patent: 5796535 (1998-08-01), Tuttle et al.

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