Apparatus for generating constant-envelope, angle-modulated puls

Details Apparatus for generating constant-envelope, angle-modulated puls Apparatus for generating constant-envelope, angle-modulated puls

1979-09-19

1982-01-19

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 23A, 375 45, 375 62, H03C 340, H03K 706

Patent

active

043119719

ABSTRACT:
An improved constant-envelope, angle-modulated pulse signal generator makes use of first and second bi-phase amplitude modulators, each for modulating a carrier with supplied pulse signals. The pulse signals are representative of information and are interleaved with each other. The pulse duration is selected to cause a suitable amount of pulse overlap. When the modulated carriers are combined in phase quadrature and passed through a surface acoustic wave filter, they form a constant envelope signal. Appropriate selection of parameters can yield a sinusoidal frequency shift keyed (SFSK) signal.

REFERENCES:
patent: 3517338 (1970-06-01), Herman et al.
patent: 3699479 (1972-10-01), Thompson et al.
patent: 3973201 (1976-08-01), Andren

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