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Behavioral modeling and digital pre-distortion techniques for RF PAs in a 3 x 3 MIMO system
KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Information Science and Engineering. Department of Electrical Engineering, Mathematics and Science, University of Gävle, Gävle, Sweden.
KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Information Science and Engineering.ORCID iD: 0000-0002-2718-0262
Univ Gavle, Dept Elect Engn Math & Sci, Gavle, Sweden..
2019 (English)In: International journal of microwave and wireless technologies, ISSN 1759-0795, E-ISSN 1759-0787, Vol. 11, no 10, p. 989-999Article in journal (Refereed) Published
Abstract [en]

Modern telecommunications are moving towards (massive) multi-input multi-output (MIMO) systems in 5th generation (5G) technology, increasing the dimensionality of the systems dramatically. In this paper, the impairments of radio frequency (RF) power amplifiers (PAs) in a 3 x 3 MIMO system are compensated in both the time and the frequency domains. A three-dimensional (3D) time-domain memory polynomial-type model is proposed as an extension of conventional 2D models. Furthermore, a 3D frequency-domain technique is formulated based on the proposed time-domain model to reduce the dimensionality of the model, while preserving the performance in terms of model errors. In the 3D frequency-domain technique, the bandwidth of the system is split into several narrow sub-bands, and the parameters of the model are estimated for each sub-band. This approach requires less computational complexity, and also the procedure of the parameters estimation for each sub-band can be implemented independently. The device-under-test consists of three RF PAs including input and output cross-talk channels. The proposed techniques are evaluated in both behavioral modeling and digital pre-distortion (DPD) perspectives. The experimental results show that the proposed DPD technique can compensate the errors of non-linearity and memory effects in the both time and frequency domains.

Place, publisher, year, edition, pages
Cambridge University Press, 2019. Vol. 11, no 10, p. 989-999
Keywords [en]
Radio frequency power amplifier, non-linearity, memory effects, multiple-input multiple-output (MIMO), behavioral modelling, digital pre-distortion
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-266173DOI: 10.1017/S1759078719000862ISI: 000500870900001Scopus ID: 2-s2.0-85067662944OAI: oai:DiVA.org:kth-266173DiVA, id: diva2:1385138
Note

QC 20200113

Available from: 2020-01-13 Created: 2020-01-13 Last updated: 2020-01-13Bibliographically approved

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Alizadeh, MahmoudHändel, Peter

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