Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Multi-band predistorter using power series representation
A transmission signal containing signals of a plurality of frequency bands is divided and fed to a linear signal transfer path including a delay circuit and a plurality of distortion generation paths for the plurality of frequency bands. In each distortion generation path, the signal of the corresponding frequency band is extracted by a band signal extractor from the signal fed to the path, an odd-order distortion of the extracted signal is generated by an odd-order distortion generator, and the phase and amplitude of the odd-order distortion are adjusted by a vector adjuster to provide the output signal of the distortion generation path. The output signals from such plurality of distortion generation paths are combined by a combiner with the output from the linear signal transfer path to provide the combined output as the output from a multi-band predistorter using power series representation.
NTT DoCoMo, Inc.
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inventional inventional inventional
Shinji Shoichi Yasushi Yasunori
Mizuta Narahashi Yamao Suzuki