Quaternary phase-shift keying with time delayed channel

Details Quaternary phase-shift keying with time delayed channel Quaternary phase-shift keying with time delayed channel

1975-05-14

1977-02-01

Safourek, Benedict V.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325126, 332 21, H04L 2718

Patent

active

040064182

ABSTRACT:
A digital data communication system employing quaternary phase-shift keying for transmission by a microwave radio link. The digital modulation of the quadrature channel is delayed from the in-phase channel by one-half the time duration of a bit so that the transmitted phase does not experience a quantum shift in excess of 90.degree.. This permits the use of an injection locked oscillator as an amplifier of the microwave transmission.

REFERENCES:
patent: 3378771 (1968-04-01), Van Gerwen et al.
patent: 3423529 (1969-01-01), O'Neill, Jr.
patent: 3701020 (1972-10-01), De Vito

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