Dynamic deviation reduction-based concurrent dual-band digital predistortion

Abstract

This article introduces the concurrent dual-band digital predistortion (DPD) architecture with only one upconvertion unit, which is suitable for the linearization of wideband power amplifiers (PAs) excited by concurrent dual-band signals. By extending the conventional dynamic deviation reduction (DDR) model to the concurrent dual-band mode, we propose two DDR-based concurrent dual-band models, the dual-band DDR (DB-DDR) model and the simplified dual-band DDR (SDB-DDR) model. The performance of these two models is experimentally assessed with two types of wideband PAs (a GaN Class F PA and a GaN Doherty PA) driven by the concurrent dual-band signal, and compared with the prior two-dimensional digital predistortion (2D-DPD) model and the two-dimensional modified memory polynomial (2D-MMP) model. The results prove the good DPD performance and low computational complexity of the proposed models. V C 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:401-411, 2014.

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