Bandwidth adaptive behavioral model with dynamic structures for radio frequency power amplifiers. Issue 4 (25th December 2021)

• Record Type: Journal Article
• Authors: Wu, Jiayan; He, Songbai; Peng, Jun; Xiao, Zehua; You, Fei
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 32:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-25
• Subjects: bandwidth adaptive -- behavioral modeling -- nonlinear behavior -- power amplifiers; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.23046
• Languages: English
• ISSNs: 1096-4290

Abstract

Abstract: To cope with the degradation of digital predistortion when bandwidth changes, a bandwidth adaptive behavioral model with dynamic structures for radio frequency (RF) power amplifiers (PAs) is proposed in this article. By applying the nonlinear post‐compensation technology, PA's nonlinearity is decomposed and analyzed. Short‐time Fourier transform and transfer functions are adopted to study the influence of bandwidth variation on the linear memory effect. Based on PA's memory effect analysis, a bandwidth adaptive model with dynamic structures and a coefficient update scheme with low complexity are proposed. Experiments carried on PAs show that the proposed model achieves similar linearization performance as other conventional models. Simultaneously, the proposed model has fewer coefficients and a reduction in the coefficient update of at least 50%.