Digital communications system with immunity to frequency selecti

Details Digital communications system with immunity to frequency selecti Digital communications system with immunity to frequency selecti

1974-10-07

1976-09-14

Safourek, Benedict V.

325 65, H04B 304, H04L 2710

Patent

active

039809455

ABSTRACT:
A digital communications system with increased resistance to frequency selective fading. Digital signals to be transmitted are phase shift modulated upon a spectrum spreaded carrier. The carrier is generated by mixing the output of a band spread oscillator with a locally generated IF oscillator signal. The signal thus obtained is divided into transmission periods, each of which is longer than the maximum spreading time of the nonlinear transmission medium. The increased bandwidth occupancy thus obtained increases the immunity of the transmitted signals to frequency selective fades moving across the allocated bandwidth. The signals are received by a differentially adaptive receiver which automatically adjusts its response to the envelope of received signals.

REFERENCES:
patent: 3478268 (1969-11-01), Coviello
patent: 3665472 (1972-05-01), Kartchner et al.
patent: 3714573 (1973-01-01), Grossman
patent: 3794921 (1974-02-01), Unkauf

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