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The effect of noise upon a method of frequency measurement

Content Provider	IEEE Xplore Digital Library
Author	Pickard, T.
Copyright Year	1955
Description	The effect of noise upon a method of information transmission and recovery is analyzed. The information is coded as the frequency shift of a carrier. The carrier is assumed to be transmitted over two channels which have90^ophase difference. The recovery of the information is accomplished in a new way by measuring the frequency shift by means of a "coherent cycle counter." A general expression is obtained for the expected frequency measurement of the coherent cycle counter in terms of the signal and noise autocorrelation functions. The percentage bias of the counter is shown to be a function only of the signal-to-noise ratios in the two channels. In the noise-free case, the expected frequency measurement is given by the centroid of the signal power spectrum. When no signal is present the average indicated frequency is zero, thereby effectively cancelling the average effect of the sources of noise in the system. For applications in which the transmitted frequency fluctuates about the carrier or reference frequency, the method is shown to be superior to both an axis crossing counter and an ideal phase differentiator when it is required to operate through zero frequency difference.
Starting Page	83
Ending Page	88
Page Count	6
File Size	825468
File Format	PDF
ISSN	00961000
Volume Number	4
Issue Number	2
Language	English
Publisher Date	1958-06-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency measurement Noise shaping Counting circuits Noise measurement Fluctuations Signal to noise ratio Noise cancellation Phase noise Frequency modulation Narrowband
Content Type	Text
Resource Type	Article
Subject	Library and Information Sciences Information Systems Computer Science Applications

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