Radio transmitters and methods of operation

Details Radio transmitters and methods of operation Radio transmitters and methods of operation

1997-03-11

1998-04-28

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

455127, 330127, 375295, H04L 2720

Patent

active

057455260

ABSTRACT:
A radio transmitter has a digital modulator 10 which modulates an incoming coded signal according to .pi./4 DQPSK modulation. A signal 30 representative of the amplitude of the modulated signal is applied to a bias modulator 27 to modulate the magnitude of a bias voltage 26. The modulated bias voltage 26 is applied to a power amplifier 24 of the transmitter in order to improve the apparent linearity and adjacent channel performance of the power amplifier.

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