Communication system having improved differential phase shift ke

Details Communication system having improved differential phase shift ke Communication system having improved differential phase shift ke

1982-05-20

1984-03-06

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 48, 375 56, H04L 2710, H04L 2718

Patent

active

044358245

ABSTRACT:
A communication system which generates an output signal of a selected primary frequency having digital data bits serially modulated thereon by utilizing a hybrid differential phase shift keyed (DPSK) modulation is provided. The improved DPSK modulation is frequency modulation of a phase encoded signal. A controller controls frequency generator means which frequency shift the output signal between primary and secondary frequencies. The controller and frequency generator means provide a modulated output signal which is D.C. balanced bit by bit and has substantially reduced harmonic energy.

REFERENCES:
patent: 3665103 (1972-05-01), Watkins
patent: 4339724 (1982-07-01), Feher

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