Patent ID: 8565294
Filing Date: 2013-10-22
Classification: H04B

Abstract:
1. An interference classifier for determining whether a received signal contains a noise burst or interference comprising a sinusoidal signal, the interference classifier comprising: a buffer operable to receive and store data comprising samples of a signal; a scale factor calculator operable to calculate a scale factor for the signal samples in dependence upon the levels of the received signal samples; a normaliser operable to calculate normalised signal samples, y, by using the scale factor to normalise the received signal samples; a nonlinear transformer operable to perform a nonlinear transform, T(y), on the normalised signal samples to calculate transformed signal samples; an averaging circuit operable to calculate an average level of the transformed signal samples; and a comparator operable to compare the calculated average level of the transformed signal samples to a predetermined threshold level in order to determine whether the signal contains interference comprising a sinusoidal signal; wherein: the nonlinear transformer is operable to perform a nonlinear transform, T(y), comprising a combination of a first function, T T T