Interference management in calibration of a pre-distorter for a power amplifier of a user device. The method includes measuring strength of signals received via beams of one or more antenna arrays of a user equipment; ordering the beams on the basis of the measurement strengths; selecting from the ordered beams at least one beam for calibration of a pre-distorter for a power amplifier of the user equipment; obtaining information of available measurement resources for the calibration; transmitting a calibration signal using the selected beam at the time of the available measurement resources; receiving the calibration signal by another radio frequency chain of the antenna array which is not used in the transmission of the calibration signal; obtaining calibration information on the basis of the transmitted calibration signal and the received calibration signal; and calibrating the pre-distorter based on the calibration information.