Providing for radio frequency auto gain control (RF AGC)

Patent metadata

Field	Value
Publication number	US-9577686-B2
Application number	US-201514694691-A
Country	US
Kind code	B2
Filing date	Apr 23, 2015
Priority date	Apr 23, 2015
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A method and system for providing radio frequency auto gain control (RF AGC) for a specific frequency is provided herein. The method includes obtaining a noise measurement (N) and radio frequency level for the specific frequency; scanning a band of frequencies that the specific frequency is part of, and storing a plurality of undesired frequencies; computing a frequency intermodulation up to a predetermined level based on the plurality of undesired frequencies; and in response to the frequency intermodulation being not equal to the specific frequency, performing an iterative process to readjust the RF AGC, the iterative process including a readjustment of the RF AGC based on a noise floor performance.

First claim

We claim:

1. A method for providing radio frequency auto gain control (RF AGC) for a specific frequency, comprising:
obtaining a noise measurement (N) and radio frequency level for the specific frequency;
scanning a band of frequencies that the specific frequency is part of, and storing a plurality of identified frequencies;
at least one frequency intemodulation is calculated by the stored plurality of identified frequencies;
in response to the at least one frequency intermodualtion being not equal to the specific frequency, performing an iterative process to readjust the RF AGC, the interative process including a readjustment of the RF AGC based on a noise floor performance.

2. The method according to claim 1 , wherein the computing of the at least one frequency intermodulation (F IMx ) further comprises defining F IMx by the following relationship:
p*f u1 +−q*f u2 ,

where,
p is a first number up to x associated with an order of intermodulation,
q is a second number up to x associated with an order of intermodulation,
x is a predefined number correlating to a number of orders to be produced,
f u1 and f u2 are defined by the plurality of identified frequencies.

3. The method according to claim 2 , wherein the iterative process to readjust the RF AGC further comprises:
determining whether a desired signal strength (V d ) is above a predetermined threshold (V g );
in response to V d <V g , determining whether the F d is different than any of F IMx calculated, and in response to F d being different:
reducing the RF AGC by a predetermined amount.

4. The method according to claim 3 , wherein the iterative process further comprises:
measuring a noise (N 1 ) after reducing the RF AGC; and
comparing the N 1 with N, and in response N 1 being larger than N, increasing the RF AGC by a predetermined amount.

5. The method according to claim 4 , wherein the iterative process further comprises:
in response N 1 being smaller than N, equating N as N 1 ; and
iteratively re-performing the reducing.

6. The method according to claim 4 , comprising:
measuring a noise floor after increasing the RF AGC by a predefined amount (N 2 );
comparing N 2 and N, and in response to N 2 being larger, increasing the RF AGC by a predetermined amount.

7. The method according to claim 1 , wherein the method is re-performed after a predetermined delay.

Assignees

• Kuo Yao H
• Barranger Christopher John
• Visteon Global Tech Inc

Inventors

• Kuo Yao H
• Barranger Christopher John

Classifications

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04B1/1027 Primary

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H03G3/3036

  in high-frequency amplifiers or in frequency-changers (H03G3/3052, H03G3/32, H03G3/34 take precedence) · CPC title

• H04B1/16 Primary

  Circuits · CPC title

• H03G3/3052

  in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver (H03G3/32, H03G3/34 take precedence) · CPC title