2026-04-17T01:12:27Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1742392026-02-09T05:54:40Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Gilabert Pinal, Pere Lluís author López Bueno, David author Montoro López, Gabriel author 2018-01-01 "© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works." This paper presents a new variant of the orthogonal matching pursuit (OMP) algorithm for reducing the computational complexity of the digital predistortion (DPD) behavioral model in the forward path. The proposed spectral weighting OMP (SW-OMP) algorithm focuses on selecting the most relevant basis functions to compensate for the out-of-band residual distortion which may eventually be masked by the dominant in-band residual error. This basis selection is carried out in an off-line process that does not affect the computational complexity of the real-time closed-loop DPD but, on the contrary, reduces its complexity while enhancing the robustness. Experimental results show that by selecting the DPD coefficients with the SW-OMP, the inherent ACLR and NMSE degradation suffered when reducing the number of coefficients is mitigated under strong nonlinear operation, when compared to using the basis functions selected by the classical OMP algorithm. Peer Reviewed Postprint (author's final draft) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació Àrees temàtiques de la UPC::Enginyeria electrònica::Circuits electrònics Very high speed integrated circuits Sustainable development 5G mobile communication Power amplifiers Digital predistortion linearization Circuits integrats d'alta velocitat Desenvolupament sostenible Spectral weighting orthogonal matching pursuit algorithm for enhanced out-of-band digital predistortion linearization