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An FM Detector for Low S/N

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1 Author(s)
Park, J. ; Univ. of Minnesota, Minneapolis, Minn.

Conventional frequency-modulation (FM) detectors show a marked decrease in outputS/Nbelow an inputS/Nof 5 to 10 dB. This threshold effect is caused by "clicks" or phase slips of multiples of π. This effect is related to a normalization (clipping) which is very beneficial at highS/N. A detector is described which has no normalization and is superior to the ideal detector below zero to 10 dB inputS/N. The noise at the output of the detector is additive for all inputS/Nratios and in this sense is comparable to synchronous detection of AM. Plots of output noise spectrum and outputS/Nwith and without sine-wave modulation are given. Another detector is also proposed that is asymptotic to the ideal detector at highS/Nand the aforementioned detector at lowS/N. Comparison is made with conventional detectors. The results indicate that this detector may be especially useful in the detection of frequency-shift keying and phase-shift keying in telemetry systems.

Published in:

Communication Technology, IEEE Transactions on  (Volume:18 ,  Issue: 2 )

Date of Publication:

April 1970

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