Suppression of Impulsive Noise in FM via Rank Order Processing

Abstract

Suppression of impulsive non-Gaussian noise in FM, via rank order signal processing methods, appears feasible in circumstances whose precise limits, particularly in terms of bandwidth and levels of nonimpulsive noise, remain to be determined. The methods are related to median filtering, but are elaborated in the sense of admitting more operations on the signal values. The application is feasible because demodulatian of FM requires only zero crossing information, and because rank order processors can be defined whose root signals have the same sign changes as the FM signals admitted.