Patent ID: 8903336

Claim:
A method for compensating signal distortions in multiple transmitting branches entering a composite amplifier, the method comprising: providing an input signal to the composite amplifier; observing an output signal from the composite amplifier; deriving an error in the output signal by comparing the output signal with an ideal output signal; deriving the individual contribution from each transmitting branch to the error by utilising a composite amplifier model, said composite amplifier model comprising information about the contribution from each constituent amplifier to the output signal for each provided input signal; compensating the signal distortions in the transmitting branches accordingly; deriving the contribution from different parameters in the transmitting branches to the signal distortion that causes the observed error by utilising a transmitting branch model comprising information about the parameters that affect signal distortions in each transmitting branch; and providing compensating parameters or adjustments to already existing compensating parameters to each transmitting branch accordingly in order to decrease the signal distortions.