PSK modulator with reduced spectrum occupancy

Details PSK modulator with reduced spectrum occupancy PSK modulator with reduced spectrum occupancy

1974-08-16

1976-08-03

Griffin, Robert L.

Telegraphy

Systems

Printing

178 66A, 325147, 332 23R, H04B 104

Patent

active

039732010

ABSTRACT:
A premodulation filter is used to slow the transitions of a digital data signal to reduce spectrum occupancy. Carrier signal generator means provides in-phase and quadrature-phase carrier signals. A first modulation means receives the in-phase carrier signal for modulation by the filtered digital data signal. A second modulation means receives the quadrature-phase carrier signal and a control signal for modulation of the quadrature-phase carrier signal by the control signal. A combining means receives the modulated signals from the first and the second modulation means for providing a combined output signal. An amplitude limiter receives the combined output signal for limiting the amplitude variations in the combined signal. A circuit means receives the filtered digital data signal, and provides the control signal which adjusts the amplitude of the quadrature-phase carrier signal to complement the amplitude of the modulated in-phase carrier signal.

REFERENCES:
patent: 2238249 (1941-04-01), Crosby
patent: 3123670 (1964-03-01), Kaenel
patent: 3755739 (1973-08-01), Okano

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