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Combating the Dimensionality of Nonlinear MIMO Amplifier Predistortion by Basis Pursuit
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-8460-6509
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0003-1183-6666
Univ Gavle, Dept Elect Math & Nat Sci, S-80176 Gavle, Sweden..
Univ Gavle, Dept Elect Math & Nat Sci, S-80176 Gavle, Sweden..ORCID iD: 0000-0003-2887-049X
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2014 (English)In: 2014 44TH EUROPEAN MICROWAVE CONFERENCE (EUMC), IEEE , 2014, p. 833-836Conference paper, Published paper (Refereed)
Abstract [en]

A general description of nonlinear dynamic MIMO systems, given by Volterra series, has significantly larger complexity than SISO systems. Modeling and predistortion of MIMO amplifiers consequently become unfeasible due to the large number of basis functions. We have designed digital predistorters for a MIMO amplifier using a basis pursuit method for reducing model complexity. This method reduces the numerical problems that appear in MIMO Volterra predistorters due to the large number of basis functions. The number of basis functions was reduced from 1402 to 220 in a 2x2 MIMO amplifier and from 127 to 13 in the corresponding SISO case. Reducing the number of basis functions caused an increase of approximately 1 dB of model error and adjacent channel power ratio.

Place, publisher, year, edition, pages
IEEE , 2014. p. 833-836
Series
European Microwave Conference, ISSN 2325-0305
Keywords [en]
Digital pre distortion (DPD), MIMO power amplifiers, LASSO, basis pursuit, power amplifier linearization
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-243771ISI: 000392912200209ISBN: 978-2-87487-035-4 (print)OAI: oai:DiVA.org:kth-243771DiVA, id: diva2:1287979
Conference
44th European Microwave Conference (EuMC), OCT 05-10, 2014, Rome, ITALY
Note

QC 20190212

Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-12Bibliographically approved

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Zenteno, EfrainAmin, ShoaibHändel, Peter

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