Method and apparatus for generating a composite signal

Details Method and apparatus for generating a composite signal Method and apparatus for generating a composite signal

2006-05-02

2006-05-02

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

C327S291000, C341S020000, C341S173000

Reexamination Certificate

active

07039122

ABSTRACT:
A programmable waveform generator forms a composite transmission signal containing multiple information signals using a reduced number of hardware components to modulate the phase and amplitude of the carrier signal. A signal generator develops baseband direct sequence spread spectrum digital bit streams from corresponding input data signals. The values of the digital bit steams are used to simultaneously control states of phase modulators and variable attenuators which modulate the phase and amplitude of the in-phase and quadrature carrier components. The programmable waveform generator can be used to implement an interplex modulator producing a constant-envelope composite signal with fewer phase modulators and attenuators.

REFERENCES:
patent: 6335951 (2002-01-01), Cangiani et al.
patent: 2002/0075907 (2002-06-01), Cangiani et al.
Park, K., “Quadrature-Multiplex Modulation, System with Application to the Orbiter's Ku-band Link,” National Telecommunications Conference, Dec. 1, 1975, pp. 33-22-33-26, XP008039410, New York, United States.

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