Method for Calibrating Automatic Gain Control in Wireless Devices

• US 20080096500A1
• Filed: 12/21/2007
• Published: 04/24/2008
• Est. Priority Date: 12/20/2002
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Eilts, Henry, Hosur, Srinath
• Granted Patent: US 7,957,713 B2
• Time in Patent Office: Days
• US Class Current: 455/136
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

Disclosed herein is an iterative process for calibrating an AGC in a wireless system, wherein the iterative process comprises transmitting a calibration signal, receiving the calibration signal, decoding the calibration signal to produce a measurement, storing the measurement and changing an AGC gain setting.

Claims

1-35. -35. (canceled)

36. A MIMO-based system comprising an Automatic Gain Control (AGC), wherein the AGC is calibrated by way of an iterative process, the iterative process comprising:

transmitting a calibration signal;

receiving the calibration signal;

decoding the calibration signal to produce measurements;

storing the measurements;

changing an AGC gain setting; and

increasing transmission power by L decibels after an AGC gain setting is decreased by L decibels, wherein L is specified by an end-user.

37. A MIMO-based system comprising an Automatic Gain Control (AGC), wherein the AGC is calibrated by way of an iterative process, the iterative process comprising:

transmitting a calibration signal;

receiving the calibration signal;

decoding the calibration signal to produce measurements;

storing the measurements;

changing an AGC gain setting; and

decreasing transmission power by L decibels after increasing an AGC gain setting by L decibels, wherein L is specified by an end-user.

38. A MIMO-based system comprising an Automatic Gain Control (AGC), wherein the AGC is calibrated by way of an iterative process, the iterative process comprising:

transmitting a calibration signal;

receiving the calibration signal;

decoding the calibration signal to produce measurements;

storing the measurements;

changing an AGC gain setting; and

producing a first measurement after decreasing the AGC gain setting by L decibels;

increasing transmission power by L decibels; and

repeating the first measurement without changing the AGC gain setting to produce a second measurement;

wherein L is specified by an end-user.

39. The system of claim 38, further comprising determining a correction factor, wherein said correction factor is equivalent to the quotient obtained by dividing the first measurement by the second measurement, and wherein subsequent measurements are multiplied by said factor.

40. The system of claim 39, wherein at least two factors are multiplied to produce a combined correction factor, and wherein subsequent measurements are multiplied by said combined correction factor.