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.
A concurrent dual-band three-layered biased memory polynomial (DB-TLBMP) model is proposed for the linearization of wideband power amplifiers driven by large carrier spacing two-carrier signals. The DB-TLBMP model is derived by extending the TLBMP model to the concurrent dual-band mode, and the least square algorithm is used for coefficients extraction of each layer. Using a two-carrier wideband code division multiple access signal with 40-MHz carrier spacing at 2.65 GHz, whose peak-to-average power ratio is 7.74 dB, the adjacent channel leakage ratios (ACLRs) improvement of more than 17 dBc are achieved to give the ACLRs below 250 dBc at the offset of 65 MHz and an average output power of 37 dBm.
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