Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Power series digital predistorter and control method therefor
A power series digital predistorter includes a combiner which combines an output from a linear transmission path with an output from an odd-order distortion generating path, an analog-to-digital converter which converts a feedback signal from an output of a power amplifier to a digital feedback signal, an odd-order distortion vector control part which controls vector adjustment performed by an odd-order distortion vector adjusting part in the odd-order distortion generating path, a cancellation signal generating part which generates a cancellation signal from an input transmission signal, a combiner 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 which controls the cancellation signal generating part so that the cancellation signal suppresses a main signal component in the feedback signal at the combiner.
NTT DoCoMo, Inc.
H H
H03F H03F
inventional inventional
Shoichi Junya Yasunori
Narahashi Ohkawara Suzuki