Demodulation system for PSK signals with low carrier to noise ra

Details Demodulation system for PSK signals with low carrier to noise ra Demodulation system for PSK signals with low carrier to noise ra

1988-10-21

1990-03-27

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

375 83, H04L 2722

Patent

active

049124226

ABSTRACT:
A PSK signal which is subject to frequency fluctuation and noise is demodulated by using a regenerated carrier signal and a regenerated clock signal which are derived from the output of bandpass filters (19, 24) for increasing the carrier to noise ratio C/N. The center frequency of bandpass filter is determined by converting the received time domain signal to a frequency domain signal by using a FFT (fast Fourier transform) circuit, and estimating the center frequency on the frequency spectrum based on the fact that the modulated signal component exists only on a portion which has a high level on the frequency spectrum.

REFERENCES:
patent: 4618830 (1986-10-01), Mori et al.
"A Method of High Precision Frequency Detecton with FFT", Makoto Tabei et al., vol. J 70-A, No. 5, pp. 798-805, May 1987.
"A Calculative Demodulation Method for PSK Signals in Burst Mode", Teruhiko Honda et al., pp. 57-64, Oct. 30, 1987.
"A Demodulation Method by Stored Signal Processing for PSK Burst Signal (I)", Yoshio Takeuchi et al., pp. 7-12, Sep. 29, 1988.
"A Demodulation Method by Stored Signal Processing for PSK Burst Signal (II)", Yoshio Takeuchi et al., pp. 13-18, Sep. 29, 1988.

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