Methods for detecting and classifying signals transmitted over a radio frequency spectrum
First Claim
1. A dynamic spectrum access device comprising:
- a detector configured to measure energy within a plurality of bins, the plurality of bins being within a channel identified by a channelization for a spectrum region of interest, wherein a size of the channel is selected to correspond to an expected size of a target signal; and
a processor configured to;
determine a degree of correlation between the measured energy and a target signal channel mask selected from among a plurality of signal masks; and
responsive to determining that the degree of correlation between the measured energy and the target signal channel mask is not above a correlation threshold;
classify the measured energy as a wide band signal candidate;
generate a max-hold power spectrum based on a plurality of max-hold overlays;
apply a threshold to the max-hold power spectrum; and
apply a channel mask to the max-hold power spectrum to identify the wide band signal candidate as one of;
a target signal, a wide band non-cooperative signal, and noise.
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Abstract
A method for classifying a signal can be used by a station or stations within a network to classify the signal as non-cooperative (NC) or a target signal. The method performs classification over channels within a frequency spectrum. The percentage of power above a first threshold is computed for a channel. Based on the percentage, a signal is classified as a narrowband signal. If the percentage indicates the absence of a narrowband signal, then a lower second threshold is applied to confirm the absence according to the percentage of power above the second threshold. The signal is classified as a narrowband signal or pre-classified as a wideband signal based on the percentage. Pre-classified wideband signals are classified as a wideband NC signal or target signal using spectrum masks.
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Citations
20 Claims
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1. A dynamic spectrum access device comprising:
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a detector configured to measure energy within a plurality of bins, the plurality of bins being within a channel identified by a channelization for a spectrum region of interest, wherein a size of the channel is selected to correspond to an expected size of a target signal; and a processor configured to; determine a degree of correlation between the measured energy and a target signal channel mask selected from among a plurality of signal masks; and responsive to determining that the degree of correlation between the measured energy and the target signal channel mask is not above a correlation threshold; classify the measured energy as a wide band signal candidate; generate a max-hold power spectrum based on a plurality of max-hold overlays; apply a threshold to the max-hold power spectrum; and apply a channel mask to the max-hold power spectrum to identify the wide band signal candidate as one of;
a target signal, a wide band non-cooperative signal, and noise. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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measuring, by a spectrum detector, energy within a plurality of bins, the plurality of bins being within a channel identified by a channelization for a spectrum region of interest, wherein a size of the channel is selected to correspond to an expected size of a target signal; determining a degree of correlation between the measured energy and a target signal channel mask selected from among a plurality of signal masks; and responsive to determining that the degree of correlation between the measured energy and the target signal channel mask is not above a correlation threshold; classifying the measured energy as a wide band signal candidate; generating a max-hold power spectrum based on a plurality of max-hold overlays; applying a threshold to the max-hold power spectrum; and applying a channel mask to the max-hold power spectrum to identify the wide band signal candidate as one of;
a target signal, a wide band non-cooperative signal, and noise. - View Dependent Claims (7, 8, 9, 10)
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11. A dynamic spectrum access device comprising:
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a detector configured to measure energy within a plurality of bins, the plurality of bins being within a channel identified by a channelization for a spectrum region of interest, wherein at least one channel identified by the channelization at least partially overlaps at least one other channel identified by the channelization; and a processor configured to; determine, on a channel by channel basis, whether the energy measured within the plurality of bins within the channel is a narrowband signal by comparing an energy of the channel with each of a first threshold and a second threshold, wherein the second threshold is lower than the first threshold; compare a mask, selected from a plurality of masks, to the spectrum within each channel to determine a degree of correlation between the mask and the energy measured within the plurality of bins within the channel; if the degree of correlation between the mask and the energy measured within the plurality of bins within the channel is above a correlation threshold, classify the received signal as a narrowband signal; and if the degree of correlation between the mask and energy measured within the plurality of bins within the channel is not above the correlation threshold; determine a degree of correlation between the measured energy and a target signal channel mask; classify the measured energy as a wideband signal candidate; generate a max-hold power spectrum based on a plurality of max-hold overlays; apply a threshold to the max-hold power spectrum; and apply a channel mask to the max-hold power spectrum to identify the wide band signal candidate as one of;
a target signal, a wide band non-cooperative signal, and noise. - View Dependent Claims (12, 13, 14, 15)
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16. A method comprising:
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measuring, by a detector, energy within a plurality of bins, the plurality of bins being within a channel identified by a channelization for a spectrum region of interest, wherein at least one channel identified by the channelization at least partially overlaps at least one other channel identified by the channelization; determining, on a channel by channel basis whether the energy measured within the plurality of bins within the channel is a narrowband signal by comparing an energy of the channel with each of a first threshold and a second threshold, wherein the second threshold is lower than the first threshold; comparing a mask, selected from a plurality of masks, to the spectrum within each channel to determine a degree of correlation between the mask and the energy measured within the plurality of bins within the channel; if the degree of correlation between the mask and the energy measured within the plurality of bins within the channel is above a correlation threshold, classifying the received signal as a narrowband signal; and if the degree of correlation between the mask and the energy measured within the plurality of bins within the channel is not above the correlation threshold; determining a degree of correlation between the measured energy and a target signal channel mask; classifying the measured energy as a wideband signal candidate; generating a max-hold power spectrum based on a plurality of max-hold overlays; applying a threshold to the max-hold power spectrum; and applying a channel mask to the max-hold power spectrum to identify the wide band signal candidate as one of;
a target signal, a wide band non-cooperative signal, and noise. - View Dependent Claims (17, 18, 19, 20)
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Specification