Automatic gain control for communication receivers

Details Automatic gain control for communication receivers Automatic gain control for communication receivers

2007-08-07

2007-08-07

Kim, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S317000, C375S318000, C455S127200, C455S127100, C455S194200

Reexamination Certificate

active

10057502

ABSTRACT:
A communication receiver amplifies a pulse-amplitude-modulated (PAM) signal representing an integer-valued sequence of first data elements (D1) with an adjustable first gain (G1) and digitizes the amplified signal to produce a sequence of second data elements (D2) representing successive magnitudes of the PAM signal. A first automatic gain control (AGC) circuit determines the rate at which magnitudes of the second data sequence elements fall within a first range and adjusts G1to maintain that rate within a second range. Digital signal processing circuits within the receiver process the second data to produce a sequence of third data elements (D3), each having a real number value substantially equal to a product of a second gain G2and a corresponding one of the first data elements D1.A slicer rounds the real number represented by each third data sequence element to produce a corresponding integer-valued element of a fourth data sequence (D4). A second AGC circuit adjusts the second gain based on a combination of a sign of each fourth sequence element and a sign of a difference between corresponding third and fourth data sequence elements to keep each third data element as close as possible in value to its corresponding first data element.

REFERENCES:
patent: 6577196 (2003-06-01), Hart
patent: 6870891 (2005-03-01), Wu et al.
patent: 2003/0194029 (2003-10-01), Heinonen et al.
“Quadrature Amplitude Modulation”, http://www.altera.com/products/ip/altera/t-alt-qam.html, pp. 1-2.

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