Transmitter apparatus for mobile satellite communication termina

Details Transmitter apparatus for mobile satellite communication termina Transmitter apparatus for mobile satellite communication termina

1994-12-20

1997-05-13

Chin, Wellington

Pulse or digital communications

Transmitters

Angle modulation

332103, 375235, 455 42, H04L 2720

Patent

active

056299613

ABSTRACT:
A transmitter apparatus for a mobile satellite communication terminal comprises a Nyquist filter having input to it two series of orthogonal data and equalizing them for a waveform, an envelope equalizer equalizing the output of the filter so that the distance of an envelope (locus) on an orthogonal axis is always constant from the origin, a phase modulator receiving the output signals from the envelope equalizer and phase-modulating them, and a power amplifier receiving the output of the phase modulator, and power-amplifying it at a high-frequency band. Thus, it becomes possible to eliminate the effects of AM-PM conversion distortion in the power amplifier.

REFERENCES:
patent: 4565980 (1986-01-01), Ashida
patent: 4635276 (1987-01-01), Karabinis
patent: 4706261 (1987-11-01), Torre et al.
patent: 4771438 (1988-09-01), Nash
patent: 4881240 (1989-11-01), Critchlow et al.
patent: 5093637 (1992-03-01), Isota et al.
patent: 5157691 (1992-10-01), Ohkubo et al.

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