Autocorrelation-based spectrum sensing for fm signals
AssigneeThomson Licensing
InventorsWen Gao, Hou-Shin Chen
Life of this patent
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Abstract
A method and system for detection of available a white space channel in an area of licensed transmitters includes a detector which utilizes the autocorrelation analysis of a channel in an frequency modulated (FM) band. Calculation of the autocorrelation excludes an initial set of correlation delay values such that large values of autocorrelation are removed. The remaining autocorrelation based on higher correlation delay values exposes the sinusoidal nature of an FM transmitter operating in the selected channel. White space becomes available to a user if no transmitter is detected using the autocorrelation detection method.
Claims17
A method performed by a device to detect band availability, the method comprising:
- obtaining a digital sample set of a selected frequency band;
- calculating an autocorrelation function using the digital sample set, wherein the autocorrelation function is calculated by excluding a set of initial correlation delay values;
- calculating a decision statistic;
- and
- determining if a frequency modulation (FM) signal is operating in the selected frequency band based on the decision statistic.
A device to detect frequency modulated signals in a frequency band, the device comprising:
- an analog to digital converter to produce a digital sample of a selected band;
- a processor having access to memory, wherein the processor calculates an autocorrelation function using the digital sample such that the autocorrelation function is calculated by excluding a set of initial correlation delay values, wherein the processor calculates a decision statistic using the autocorrelation function, and determines if a frequency modulation (FM) signal is present in the selected frequency band based on the decision statistic.
Dependencies are inferred from the claim text.