Method and device for coherent demodulation of a digitally modul

Details Method and device for coherent demodulation of a digitally modul Method and device for coherent demodulation of a digitally modul

1984-09-18

1986-04-29

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329105, 329122, 331 4, 331 23, 358 25, 375120, 375112, H04L 2714, H04L 2722

Patent

active

045859981

ABSTRACT:
A digitally modulated carrier modulated by phase shift keying or frequency shift keying with phase continuity, transmitted as useful bursts distributed at equal time intervals with phase continuity from each burst to the next burst. The carrier frequency is recovered by squaring the carrier for obtaining a spectrum and selecting the carrier frequency within said spectrum. Bursts at an acquisition frequency having the same frequency as the carrier, having a time duration longer than the time duration of the useful bursts and having characteristic features which are particular to said acquisition burst, are sent at times which are separated by time periods having a duration which is longer than the repetition period of the useful bursts by at least an order of magnitude. The acquisition bursts are received along with the useful bursts and squared to provide an acquisition spectrum. A frequency which is double of the carrier frequency is selected within the acquisition period by identifying the characteristic feature of the acquisition bursts.

REFERENCES:
patent: 3525945 (1970-08-01), Puente
patent: 4308503 (1981-12-01), Scott
patent: 4339725 (1982-07-01), Ichiyoshi

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