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US 2010/0302459 A1Published application
Applying Spurious Interference Rejection to Detect Incumbent Users of Television Channels
AssigneeQUALCOMM Incorporated
InventorsWenyi Zhang, Stephen J. Shellhammer
Life of this patent
Estimating the term…
Abstract
The use of white space devices in unused portions of the television channel spectrum is facilitated by spectrum sensing techniques that combine interference rejection techniques with feature extraction techniques to detect presence or absence of incumbent users in the spectrum.
Claims25
A method of analyzing a portion of a radio frequency (RF) spectrum, comprising:
- using an RF receiver to convert an RF input signal to a sampled baseband signal;
- establishing a noise floor for power spectral density estimation;
- producing for the sampled baseband signal an associated power spectral density estimate that incorporates the noise floor;
- and
- using the power spectral density estimate to determine whether an RF channel user is active in the portion of the RF spectrum.
2 more elements
An apparatus for analyzing a portion of a radio frequency (RF) spectrum, comprising:
- an RF receiver for converting an RF input signal to a sampled baseband signal;
- a noise floor unit for establishing a noise floor for power spectral density estimation;
- a power spectral density estimator coupled to said receiver and said noise floor unit, said power spectral density estimator cooperable with said receiver and said noise floor unit to produce for the sampled baseband signal an associated power spectral density estimate that incorporates the noise floor;
- and
- a detection unit coupled to said power spectral density unit and configured for using the power spectral density estimate to determine whether an RF channel user is active in the portion of the RF spectrum.
2 more elements
An apparatus for analyzing a portion of a radio frequency (RF) spectrum, comprising:
- means for converting an RF input signal to a sampled baseband signal;
- means for establishing a noise floor for power spectral density estimation;
- means for producing for the sampled baseband signal an associated power spectral density estimate that incorporates the noise floor;
- and
- means for using the power spectral density estimate to determine whether an RF channel user is active in the portion of the RF spectrum.
2 more elements
A computer program product for supporting analysis of a portion of a radio frequency (RF) spectrum, comprising:
- a computer-readable medium comprising:
- code for causing at least one data processor to receive a sampled baseband signal corresponding to an RF input signal;
- code for causing the at least one data processor to establish a noise floor for power spectral density estimation;
- code for causing the at least one data processor to produce for the sampled baseband signal an associated power spectral density estimate that incorporates the noise floor;
- and
- code for causing the at least one data processor to use the power spectral density estimate to determine whether an RF channel user is active in the portion of the RF spectrum.
3 more elements
A method of analyzing a portion of a radio frequency (RF) spectrum, comprising:
- converting an RF input signal to a sampled baseband signal;
- processing the sampled baseband signal to produce a set of complex-value signal samples;
- determining from the set of complex-value signal samples a set of respectively corresponding phase values;
- estimating a power spectral density for the set of phase values;
- and
- using the estimated power spectral density to determine whether an RF channel user is active in the portion of the RF spectrum.
3 more elements
An apparatus for analyzing a portion of a radio frequency (RF) spectrum, comprising:
- an RF receiver for converting an RF input signal to a sampled baseband signal;
- a signal processing unit coupled to said RF receiver and configured to process the sampled baseband signal to produce a set of complex-value signal samples;
- a phase extractor coupled to said signal processing unit for determining from the set of complex-value signal samples a set of respectively corresponding phase values;
- a power spectral density estimator coupled to said phase extractor for estimating a power spectral density for the set of phase values;
- and
- a detection unit coupled to said power spectral density estimator and configured for using said estimated power spectral density to determine whether an RF channel user is active in the portion of the RF spectrum.
3 more elements
An apparatus for analyzing a portion of a radio frequency (RF) spectrum, comprising:
- means for converting an RF input signal to a sampled baseband signal;
- means for processing the sampled baseband signal to produce a set of complex-value signal samples;
- means for determining from the set of complex-value signal samples a set of respectively corresponding phase values;
- means for estimating a power spectral density for the set of phase values;
- and
- means for using the estimated power spectral density to determine whether an RF channel user is active in the portion of the RF spectrum.
3 more elements
A computer program product for supporting analysis of a portion of a radio frequency (RF) spectrum, comprising:
- a computer-readable medium comprising:
- code for causing at least one data processor to receive a sampled baseband signal corresponding to an RF input signal;
- code for causing the at least one data processor to process the sampled baseband signal to produce a set of complex-value signal samples;
- code for causing the at least one data processor to determine from the set of complex-value signal samples a set of respectively corresponding phase values;
- code for causing the at least one data processor to estimate a power spectral density for the set of phase values;
- and
- code for causing the at least one data processor to use the estimated power spectral density to determine whether an RF channel user is active in the portion of the RF spectrum.
4 more elements
Dependencies are inferred from the claim text.