Method and circuit arrangement for producing a QPSK signal on wh

Details Method and circuit arrangement for producing a QPSK signal on wh Method and circuit arrangement for producing a QPSK signal on wh

1991-09-10

1994-02-22

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 54, 332104, H04L 2718

Patent

active

052895033

ABSTRACT:
A method of generating a composite signal in the form of a QPSK signal on which an additional carrier signal is superposed, wherein a carrier signal is conducted through two series connected, switchable phase shifters. One of the phase shifters is controlled by one of two data signals. Both data signals are logically linked with one another by a logic circuit, and the resulting linkage signal used to control the other phase shifter. The phase states into which each phase shifter can be switched are selected and the linkage signal formed from the data signals such that, with the available values of the data signals, the carrier signal passing through the phase shifters is brought into the phase positions that should exist with the additional carrier signal superposed.

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"High data rate Solid-state millimeter-wave transmitter module" Jun. 1975, published by IEEE New York, pp. 470-477.
Poppe, "Double Phase-Shift Keying Speeds Data Over Voice Channels", Electronics, Oct. 1966, pp. 91-96.
Patent Abstracts of Japan, vol. 14, No. 82 (E-889) Feb. 15, 1989.
"Tracking and Data Relay Satellite System (TDRSS) Users' Guide", Revision 5, Sep. 1984, published by National Aeronautic and Space Administration, Goddard Space Flight Center.

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