System and method for statistically directing automatic gain control
DC CAFCFirst Claim
1. An automatic gain control system comprising:
- means for tabulating statistical information about periodicity and duration of RF interference; and
means operable, at least in part, to certain tabulated statistics for directing receiver gain of said gain control system.
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Abstract
The present invention is directed to a system and method which statistically determines when regularly occurring interference events of a predictable duration will occur, for example radar pulses and dynamically adjusts an automatic gain control (AGC) for RF data transmissions accordingly. The repetition rate and width of radar pulses are regular. By averaging and watching for correlations, the present AGC identifies the pulse rate and pulse widths and over a fairly short period of time predicts when the next pulse is coming. When the next pulse occurs, the AGC is adjusted to react accordingly. The AGC can raise or lower gain levels for the duration of the pulse; or ignore the pulse, if it is of a very short duration, so that the AGC level will coast through the event.
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Citations
30 Claims
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1. An automatic gain control system comprising:
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means for tabulating statistical information about periodicity and duration of RF interference; and means operable, at least in part, to certain tabulated statistics for directing receiver gain of said gain control system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for operating a gain control circuit, said method comprising the steps of:
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gathering statistical information about periodicity and duration of RF interference; and directing receiver gain of said gain control circuit under at least partial control of said gathered statistical information to mitigate effects of said interference. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A circuit for an RF data transmission system, said circuit comprising:
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a digital delay stage delaying incoming RF data signals and outputting delayed IF signals; a variable gain stage receiving said delayed IF signals and outputting gain adjusted IF signals to a demodulator for said system; means for monitoring RF interference; means for gathering statistical information about periodicity and duration of said RF interference; and means for controlling said variable gain stage in response to said gathered statistical information to adjust gain of said delayed IF signals mitigating effects of said RF interference on said signals. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A circuit for an RF data transmission system, said circuit comprising:
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a digital delay stage delaying incoming RF data signals and outputting delayed IF signals; a variable gain stage receiving said delayed IF signals and outputting gain adjusted IF signals to a demodulator for said system; a statistics gathering engine collecting periodicity, duration and strength information about RF interference; and a response stage adjusting said variable gain stage in response to said periodicity and duration information to mitigate effects of said RF interference on said signals. - View Dependent Claims (27, 28, 29, 30)
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Specification