JOINT ADAPTIVE COMPENSATION FOR AMPLIFIER NONLINEARITY AND QUADRATURE MODULATION ERRORS

摘要

A joint adaptive compensation scheme for amplifier nonlinearity and quadrature modulation errors is provided to compensate nonlinearity and quadrature modulation errors of an amplifier in a PD(PreDistortion) scheme with or without a memory. In a joint adaptive compensation scheme for amplifier nonlinearity and quadrature modulation errors, predistortion(PD)(100) is performed to compensate nonlinearity of an amplifier. Quadrature modulation compensation(QMC)(200) is performed as to a signal going through the predistortion. PD(PreDistortion) training is performed while the QMC signal and a QMC signal of a transmission signal are fed back. QMC training is performed as to the signal going through the PD training. Parameters of the PD training and the QMC training are updated simultaneously on the basis of indirect learning architecture, and the acquired parameters show predistortion and quadrature modulation compensation characteristics on a feed forward path.