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Carrier-frequency estimation based on the location of the spectra peak of a windowed sample of carrier plus noise

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4 Author(s)
Walker, W.F. ; Electrical Engng. Dept., Rochester Inst. of Technol., Rochester, NY, USA ; Sarkar, T.K. ; Fung-I Tseng ; Weiner, D.D.

The frequency of an unmodulated (CW) carrier frequency transmission may be estimated by identifying the location of the peak value of the spectrum of a windowed sample of T-seconds duration. The authors quantitatively evaluate the effect of window shape and length (leakage) as well as the effect of additive broad-band noise on the accuracy of this method of estimation. An interesting result is that neither elaborate `shaping' of the window, nor the use of the `least mean-squared' error method will have much advantage over the use of the spectral peak in a rectangularly windowed sample, unless the signal-to-in-band-noise ratio is of the order of 50 dB or better.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:IM-31 ,  Issue: 4 )