Method and apparatus for quadriphase-shift-key and linear phase

Details Method and apparatus for quadriphase-shift-key and linear phase Method and apparatus for quadriphase-shift-key and linear phase

1979-03-06

1980-08-05

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 54, 455102, 332 22, 332 23R, H04L 2718

Patent

active

042165423

ABSTRACT:
A submultiple (30Fl) of an S-band transmitter output frequency (240Fl) is divided equally between a linear phase modulation branch and a QPSK modulation branch. The linear modulation branch includes a multiplier (X7) to increase the carrier frequency to a level (210Fl) which, when combined with the carrier in the QPSK branch in an up-converter (utilizing a mixer at the input thereof followed by a bandpass filter), produces the transmitter output frequency. This allows the QPSK modulator to operate at one-eighth of the output frequency where repeatable and precisely controlled modulation can be easily achieved. This also allows linear phase modulation at one-eighth the output frequency where low modulator deviation and good linearity can be easily maintained.

REFERENCES:
patent: 2407887 (1946-09-01), Labin
patent: 3289082 (1966-11-01), Shumate
patent: 3349181 (1967-10-01), Ito
patent: 3378773 (1968-04-01), Jeffers
patent: 3714573 (1973-01-01), Grossman
patent: 3766477 (1973-10-01), Cook
patent: 3845412 (1974-10-01), Rearwin
patent: 3868599 (1975-02-01), Hirasaki et al.
patent: 3916313 (1975-10-01), Lowry
patent: 3924186 (1975-12-01), Gordy et al.
patent: 3971999 (1976-07-01), Bilsens et al.
patent: 3973201 (1976-08-01), Andren
patent: 3987374 (1976-10-01), Jones, Jr.
patent: 4006418 (1977-02-01), Liskov

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