Power series digital predistorter and control method therefor

摘要

A power series digital predistorter includes a combiner (15) which combines an output from a linear transmission path (12) with an output from an odd-order distortion generating path (13,14), an analog-to-digital converter (31) which converts a feedback signal from an output of a power amplifier (60) to a digital feedback signal, an odd-order distortion vector control part (32) which controls vector adjustment performed by an odd-order distortion vector adjusting part (14) in the odd-order distortion generating path (13,14), a cancellation signal generating part (40) which generates a cancellation signal from an input transmission signal, a combiner (24) which is inserted in a feedback signal path and which combines the cancellation signal with a signal from the feedback signal path, and a cancellation signal control part (50) which controls the cancellation signal generating part (40) so that the cancellation signal suppresses a main signal component in the feedback signal at the combiner.