A Novel FM Detector for Suppression of Interchannel Interference

In this paper a novel FM detector capable of suppressing the degradation in receiver performance due to the presence of an interfering signal is presented. This novel detector consists of two phase-locked loop FM demodulators interconnected in such a manner to permit one phase-locked loop to lock on to and track the stronger received FM signal while the other loop tracks the weaker of the two received FM signals. The detector has the capability of demodulating both the desired received FM signal as well as the interferer even for the cas e when both signals occupy the same frequency band. Experimental results demonstrating such capability are presented.