Combined coherent frequency and phase shift keying modulation sy

Details Combined coherent frequency and phase shift keying modulation sy Combined coherent frequency and phase shift keying modulation sy

1979-06-21

1981-09-15

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

375 79, 375 82, 375 91, H04L 2718, H04L 2710

Patent

active

042901405

ABSTRACT:
A system of modulation and demodulation for the transmission of binary data in the presence of multipath. The binary data modulates the phase of the carrier and the same binary data, after a delay of ".delta." bits, also modulates the frequency of the carrier. Following reception, the binary data is obtained either by frequency demodulation or by a method of coherent phase shift demodulation wherein the mark or the space frequency is selected for detection of each bit in accord with the bit received "n" bits previously. The system selects between the demodulation methods to obtain one which operates satisfactorily in the instant electromagnetic environment.

REFERENCES:
patent: 3223779 (1965-12-01), McFarlane
patent: 3223925 (1965-12-01), Florac
patent: 3617889 (1971-11-01), Rabinowitz
patent: 3619503 (1971-11-01), Ragsdale
patent: 3699479 (1972-10-01), Thompson
patent: 3750051 (1973-07-01), Brady
patent: 4003003 (1977-01-01), Heaberlin

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