Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Digital predistorter using power series model
A digital predistorter compensates for nonlinear distortion of a power amplifier using a power series model. The digital predistorter includes a distortion generating unit configured to introduce a nonlinear distortion component of a prescribed order into a digital input signal supplied to the digital predistorter. The distortion generating unit has a multiplier configured to raise the digital input signal to a power consistent with the prescribed order of the nonlinear distortion component, and a finite impulse response filter connected in series with the multiplier. The digital predistorter also includes an adaptive controller configured to receive a reference signal and adaptively adjust the tap coefficient of the finite impulse response filter so as to bring the reference signal to a desired level.
NTT DoCoMo, Inc.
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Shinji Yasushi Yasunori
Mizuta Yamao Suzuki