Patent ID: 8462881

Claim:
A radio station comprising: a digital predistortion module adapted to impose at least one digital predistortion an a payload signal thus farthing at least one predistorted payload signal, at least two transmit paths adapted to relay the at least one predistorted payload signal, an RF amplifier within the at least two transmit paths adapted to amplify the at least one predistorted payload signal, thus farming at least two transmit signals to be relayed along the at least two transmit paths, an antenna element terminating the at least two transmit paths, a coupler adapted to extract at least one coupled transmit signal out of the at least two transmit signals, a switch adapted to forward a selected one of the coupled transmit signals into a common feedback path, the common feedback path being adapted to feed the selected one of the coupled transmit signals to a digital predistortion update module adapted to update at least one of the digital predistortions; the predistortion module being further adapted to control a positioning of said switch according to a hierarchy criterion of the transmit paths thus linearising a transfer characteristic of at least two of the transmit paths according to a hierarchy of the transmit paths wherein at least two transmit paths have different rankings based on the hierarchy criterion.