Autocorrelation-based spectrum sensing for FM signals

摘要

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.

主权项

1. 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 indicating adjacent channel interference from the calculation of the autocorrelation function to reveal a sinusoidal property of a frequency modulation signal; calculating a decision statistic; and determining if a frequency modulation signal is operating in the selected frequency band based on the decision statistic.