Amplitude- and frequency- or phase-modulated radio frequency signal generator and the transmitter incorporating same
First Claim
1. A phase- or frequency-modulated and amplitude-modulated radiofrequency signal generator suitable for radio transmission, comprising:
- means for generating a phase or frequency control signal and an amplitude control signal, from a phase or frequency modulation signal and from an amplitude modulation signal respectively;
phase or frequency modulation means comprising an input which receives the phase or frequency control signal, and an output which delivers a phase- or frequency-modulated radiofrequency signal of substantially constant amplitude;
a variable-gain radiofrequency power amplifier comprising an input which receives the phase- or frequency-modulated radiofrequency signal of substantially constant amplitude, an output which delivers the phase- or frequency-modulated and amplitude-modulated radiofrequency signal, and a gain control input which receives the amplitude control signal, wherein the generating means comprise means of feedback control of the amplitude of the output signal, and, further, means of adaptive predistortion which are arranged so as, during a phase of continuous operation, to carry out a predistortion of the phase or frequency control signal as a function of the amplitude modulation signal, and so as, during a learning phase, to be adapted on the basis of the ampiltude modulation signal and of the amplitude control signal.
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Accused Products
Abstract
An amplitude- and frequency- or phase-modulated radio frequency signal generator that is used for radio emission, generates a phase or frequency control signal and an amplitude control signal from a phase or frequency modulation signal and from an amplitude modulation signal respectively. The generator comprises a phase or frequency modulator and a variable-gain radio frequency power amplifier. The amplitude of the output signal is automatically controlled. In addition, adaptive pre-distortion is carried out in order to pre-distort the phase or frequency control signal in accordance with the amplitude modulation signal during a permanent operating phase. During a learning phase, a pre-distortion module is adapted from the amplitude modulation signal and from the amplitude control signal.
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Citations
12 Claims
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1. A phase- or frequency-modulated and amplitude-modulated radiofrequency signal generator suitable for radio transmission, comprising:
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means for generating a phase or frequency control signal and an amplitude control signal, from a phase or frequency modulation signal and from an amplitude modulation signal respectively;
phase or frequency modulation means comprising an input which receives the phase or frequency control signal, and an output which delivers a phase- or frequency-modulated radiofrequency signal of substantially constant amplitude;
a variable-gain radiofrequency power amplifier comprising an input which receives the phase- or frequency-modulated radiofrequency signal of substantially constant amplitude, an output which delivers the phase- or frequency-modulated and amplitude-modulated radiofrequency signal, and a gain control input which receives the amplitude control signal, wherein the generating means comprise means of feedback control of the amplitude of the output signal, and, further, means of adaptive predistortion which are arranged so as, during a phase of continuous operation, to carry out a predistortion of the phase or frequency control signal as a function of the amplitude modulation signal, and so as, during a learning phase, to be adapted on the basis of the ampiltude modulation signal and of the amplitude control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification