Identification and pre-compensation of the electrical memory effects in wireless transceivers

Abstract

This paper proposes a novel approach to identify the electrical memory effects in wireless transceivers fed with a modulated signal. With this new proposed memory effect identification approach, the contribution of the electrical memory effects to the out-of-band emission can be distinguished easily. Furthermore, a Hammerstein and a memory polynomial pre-compensator are used to pre-correct the dynamic nonlinearity of the transceiver. Their corresponding pre-compensation performances are compared in terms of suppression level of the out-of-band emission caused by the electrical memory effects. A prototype of a wireless transceiver, which is based on an L-band 60-watt GaAs FET push-pull amplifier, is utilized to validate the proposed identification approach and evaluate the performances of the pre-compensators.