2D Extended envelope memory polynomial model for concurrent dual-band RF transmitters

• Published in: International journal of microwave and wireless technologies Vol. 9; no. 8; pp. 1619 - 1627
• Main Authors: Amin, Shoaib, Landin, Per N., Händel, Peter, Rönnow, Daniel
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.10.2017
• Subjects: Behavior; Behavioral modeling and digital predistortion of multi-band amplifiers; Errors; Intelligent industri; Intelligent Industry; Mathematical models; Measurement techniques; Polynomials; Power Amplifiers; Radio frequency; Research Papers; RF Front-ends; Signal processing; Transmitters; Two dimensional models; Power Amplifiers; Behavioral modeling and digital predistortion of multi-band amplifiers; RF Front-ends
• ISSN: 1759-0787; 1759-0795; 1759-0795
• DOI: 10.1017/S1759078717000277

The paper presents a two-dimensional (2D) extended envelope memory polynomial model for concurrent dual-band radio frequency (RF) power amplifiers (PAs). The model is derived based on the physical knowledge of a dual-band RF PA. The derived model contains cross-modulation terms not included in previously published models; these terms are found to be of importance for both behavioral modeling and digital predistortion (DPD). The performance of the derived model is evaluated both as the behavioral model and DPD, and the performance is compared with state-of-the-art 2D-DPD and dual-band generalized memory polynomial (DB-GMP) models. Experimental result shows that the proposed model resulted in normalized mean square error of −51.7/−51.6 dB and adjacent channel error power ratio of −63.1/−63.4 dB, for channel 1/2, whereas the 2D-DPD resulted in the largest model error and DB-GMP resulted in model parameters that are three times more than those resulted with the proposed model with the same performance. As pre-distorter, the proposed model resulted in adjacent channel power ratio of −55.8/−54.6 dB for channel 1/2 and is 7–10 dB lower than those resulted with the 2D-DPD model and 2–4 dB lower compared with the DB-GMP model.