Multiple phase PSK demodulator

Details Multiple phase PSK demodulator Multiple phase PSK demodulator

1989-03-07

1990-07-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329304, 375 1, 375102, H04L 2722

Patent

active

049425919

ABSTRACT:
A multiple phase PSK demodulator for use in a spread spectrum communication system includes a plurality of baseband frequency converters coupled to a corresponding plurality of differential decoders in order to directly recover the encoded PSK data. The logic outputs of the plurality of differential data decoders are coupled to a majority vote logic circuit for determining the correct logic level output signal of the plurality of differential data decoders. In another embodiment, a three phase resistive network is used to convert the two phase quadrature output of two baseband frequency converters to plural phase outputs coupled to the inputs of a corresponding plurality of differential data decoders.

REFERENCES:
patent: 3268816 (1966-08-01), Featherston
patent: 4035729 (1977-07-01), Perry
patent: 4392231 (1983-07-01), Henry
patent: 4601047 (1986-07-01), Horwitz et al.
patent: 4663768 (1987-05-01), Ryu
patent: 4714892 (1987-12-01), Ishizuka
patent: 4715047 (1987-12-01), Hambley
patent: 4715048 (1987-12-01), Masamura
patent: 4751478 (1988-06-01), Yoshida
patent: 4760344 (1988-07-01), Takase
patent: 4837786 (1989-06-01), Gurantz et al.

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