System and method for detecting valid indicator signals
First Claim
Patent Images
1. A signal detection method, comprising:
- determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band; and
indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time.
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Abstract
Disclosed are systems and methods for signal detection. In one embodiment, a method is provided for detecting a signal. In this respect, the method comprises the steps of determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band; and, comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band.
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Citations
32 Claims
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1. A signal detection method, comprising:
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determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band; and
indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A program embodied in a machine readable medium, the program comprising:
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at least one statement for determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
at least one statement for comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band; and
at least one statement for indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for signal detection, comprising:
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means for determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
means for comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band; and
means for indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for signal detection, comprising:
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an automatic gain controller adapted to normalize a signal power of an input signal across a predefined frequency spectrum;
a narrowband filter coupled to the automatic gain controller, the narrowband filter being configured to isolate a predefined frequency band of the input signal, wherein an anticipated signal is transmitted in the predefined frequency band;
a power estimator coupled to the narrowband filter for estimating the power within the predefined frequency band; and
a first logical circuit for comparing the power estimated within the predefined frequency band with a predefined power threshold to detect a presence of the anticipated signal; and
a second logical circuit for indicating a detection of the anticipated signal after the power estimated within the predefined frequency band is at least as great as the predefined power threshold for a period of time.
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32. A system for signal detection, comprising:
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a first estimator adapted to estimate a signal power of an input signal across an input signal frequency band;
a narrowband filter coupled to the first estimator, the narrowband filter being configured to isolate a predefined frequency band within the input signal frequency band, wherein an anticipated signal is transmitted in the predefined frequency band;
a second estimator adapted to estimate a second power within the predefined frequency band;
a first logical circuit to compare a ratio of the second power to the signal power with a predefined ratio threshold; and
a second logical circuit for indicating a detection of the anticipated signal after the ratio is at least as great as the predefined ratio threshold for a period of time.
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Specification