Method of carrier frequency estimation

Details Method of carrier frequency estimation Method of carrier frequency estimation

1988-09-16

1990-02-27

Chapman, John

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

G01R 2316

Patent

active

049049305

ABSTRACT:
A method is provided for searching a wide, high-noise frequency band for a narrow, phase-modulated signal to determine the approximate carrier frequency of a data signal. The method comprises the steps of sampling a received signal at a rate sufficiently high to cover the search bandwidth, performing an efficient Fourier transform on the sampled signal to obtain a discrete point power spectral density, filtering each frequency component of the power spectral density with averaging filters, analyzing the filtered components to find the area of greatest power concentration, and computing the center frequency of the area of greatest power concentration. The method determines the approximate carrier frequency of a data signal quickly and efficiently for use in starting or detecting loss of lock in a frequency-locked demodulator.

REFERENCES:
patent: 4627079 (1986-12-01), von der Embse
patent: 4665494 (1987-05-01), Tanaka
patent: 4777605 (1988-10-01), Pilkington
Brigham, Oran E., The Fast Fourier Transform, pp. 167-169 (Prentice-Hall 1974).

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