Offset quadrature phase shift keyed modulation circuit

Details Offset quadrature phase shift keyed modulation circuit Offset quadrature phase shift keyed modulation circuit

1995-07-19

1997-12-09

Chin, Stephen

Pulse or digital communications

Transmitters

Angle modulation

375302, 332103, H04L 2720

Patent

active

056967950

ABSTRACT:
An improved quadrature phase shift key modulator circuit of the type which includes a non-linear amplifier in the transmitter and includes a frequency select logic circuit for receiving the in phase and quadrature phase digital data to be modulated onto a carrier frequency signal. The output of the frequency select circuit produces select signals that are coupled to the input of a digital carrier frequency generator. The digital carrier frequency generator synthesizes and increases, decreases, or leaves unchanged the carrier frequency as a representation of the data occurring on the in phase and quadrature phase input lines. The output of the digital carrier frequency generator is smoothed and converted to an analog signal which has a constant vector power magnitude during phase change. The constant vector power when amplified in a non-linear amplifier of the transmitter is not susceptible to regeneration of side lobes of the carrier signal, thus, provides a more narrow bandwidth modulated carrier frequency signal.

REFERENCES:
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patent: 4652838 (1987-03-01), Nossen
patent: 4843351 (1989-06-01), Edwards et al.
patent: 4962510 (1990-10-01), McDavid et al.
patent: 5253271 (1993-10-01), Montgomery
patent: 5534827 (1996-07-01), Yamaji
patent: 5534828 (1996-07-01), Okada et al.

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