Method and apparatus for generating a linearly modulated signal using polar modulation
AssigneeTelefonaktiebolaget LM Ericsson
InventorsBengt Lindoff, H.ang.kan Bengt Eriksson
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Abstract
An apparatus and method generate a linearly modulated signal in a polar modulation system. A signal for transmission is separated into a phase component and an amplitude component, and a carrier signal is modulated with the phase component in a phase modulator, creating a phase distortion. A compensator compensates for the phase distortion created by the phase modulator by modifying the amplitude component. The phase modulated carrier signal is amplitude modulated by the compensated amplitude component to produce a linearly modulated signal.
Claims12
An apparatus for generating a linearly modulated signal in a polar modulation system, the apparatus comprising:
- a signal processor for separating a signal for transmission into a phase component and an amplitude component;
- a phase modulator for modulating a carrier signal with the phase component, wherein the phase modulator creates a phase distortion;
- a compensator which modifies the amplitude component, compensating for the phase distortion created by the phase modulator;
- and
- an amplitude modulator for modulating the phase modulated carrier signal with the modified amplitude component to produce a linearly modulated signal.
A method for generating a linearly modulated signal in a polar modulation system, the method comprising the steps of:
- separating a signal for transmission into a phase component and an amplitude component;
- phase modulating a carrier signal with the phase component, wherein the phase modulation creases a phase distortion;
- compensating for the phase distortion created by the phase modulation by modifying the amplitude component;
- and
- amplitude modulating the phase modulated carrier signal with the modified amplitude component to produce a linearly modulated signal.
Dependencies are inferred from the claim text.