The present invention provides a radio system (1) and a method (800) for relaying radio signals. The radio system (1) comprises at least one transmit path (70-1, 70-2,..., 70-N), a digital predistortion unit (300), a calibration unit (200) and a feedback path (400). The feedback path (400) is commonly used by the digital predistortion unit (300) and the calibration unit (200) with the present invention. The calibration signal (222) is adapted to update at least one of phase and amplitude changes (210-1, 210-2,..., 210-N) and the digital predistortion (310-1, 310-2,..., 310-N). The present invention further relates to a method (800) for relaying radio signals. The method (800) comprises updating (870) the digital predistortion (310-1, 310-2,..., 310-N) as well as an updating (880) of the phase and amplitude changes (210-1, 210-2,..., 210-N). The updating (870) of the digital predistortion (310-1, 310-2,..., 310-N) and the updating (880) of the phase and amplitude changes (210-1, 210-2,..., 210-N) is implemented using a feedback signal (90F). The present invention further relates to a computer program product for the manufacture of the radio system (1) according to the invention. The present invention further relates to a computer program product for the execution of the method (800) according to the present invention.