| 摘要 |
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.
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