Patent ID: 8072264
Filing Date: 2011-12-06
Classification: H03F,H04B

Abstract:
1. Method for controlling an amplitude of a composite amplifier in a node of a wireless communication system, said composite amplifier comprising a first amplifier and a second amplifier that are arranged to be connected via an output combiner network to a load, the method comprising: decomposing an input signal into a first signal component and a second signal component, phase shifting at least one of the first signal component and the second signal component to generate first and second phase differentiated signal components; differentiating an amplitude of the first and second phase differentiated signal components to generate first and second phase-amplitude differentiated signal components; generating a pre-distortion signal responsive to a difference between amplitudes of the first and second phrase-amplitude differentiated signal components; combining the pre-distortion signal with each of the first and second phase-amplitude differentiated signal components to generate first and second compensated signal components; and supplying the first compensated signal component to the first amplifier and the second compensated signal component to the second amplifier.