SIGNAL PROCESSING ARRANGEMENT AND SIGNAL PROCESSING METHOD

摘要

A signal processing arrangement for processing an input signal (x) has an adaptive predistorter (110, 160), an amplifier (130) and a down-converter (150). The amplifier (130) is configured to amplify a processed signal (y') to obtain an amplified signal (y"). The down-converter (150) is configured to multiply a version of the processed signal (y1) with a version of the amplified signal (y"), one of the signal versions being phase shifted, to obtain a first down -converted signal (z1, z1'), and to multiply the processed signal (y1) with the amplified signal (y") to obtain a second down-converted signal (z2, z2'). The predistorter (110, 160) is configured to predistort the input signal (x) according to a predistortion characteristic to obtain the processed signal (y'), the predistorter (110, 160) being further configured to adapt the predistortion characteristic based on the first down- converted signal (z1, z1') and the second down -converted signal (z2, z2').