Outphasing modulator

A method comprising:

• selecting a modulation method from a set of two or more modulation methods based on a position of an outphasing signal on a complex plane, wherein the position of the outphasing signal is determined based on a desired output power level, and wherein selecting comprises selecting from the set of modulation methods a first modulation method for a first region of the complex plane, a second modulation method for a second region of the complex plane, and a third modulation method for a third region of the complex plane.

A wireless communication device comprising:

• a dipole antenna operably coupled to a power amplifier;
• an outphasing modulator to provide at least first and second outphased signals to the power amplifier, wherein amplitudes of the first and second outphased signals are controlled, at least in part, by an amplitude modulation controller, which is able to vary an amplitude level of first and second control signals, respectively, according to a selected modulation method, and wherein the second control signal is able to control a variable gain amplifier of the outphasing modulator.

A wireless communication system comprising:

• a mobile station includes an outphasing modulator to provide at least first and second outphased signals to the power amplifier, wherein amplitudes of the first and second outphased signals are controlled, at least in part, by an amplitude modulation controller, which is able to vary an amplitude level of first and second control signals, respectively, according to a selected modulation method, and wherein the second control signal is able to control a variable gain amplifier of the outphasing modulator.