Combating the Dimensionality of Nonlinear MIMOAmplifier Predistortion by Basis Pursuit
2014 (English)In: Proceedings of the 44th European Microwave Conference, 2014, 833-836 p.Conference paper (Refereed)
A general description of nonlinear dynamic MIMOsystems, given by Volterra series, has significantly larger complex-ity than SISO systems. Modeling and predistortion of MIMOamplifiers consequently become unfeasible due to the largenumber of basis functions. We have designed digital predistortersfor a MIMO amplifier using a basis pursuit method for reducingmodel complexity. This method reduces the numerical problemsthat appear in MIMO Volterra predistorters due to the largenumber of basis functions. The number of basis functions wasreduced from 1402 to 220 in a 2x2 MIMO amplifier and from127 to 13 in the corresponding SISO case. Reducing the numberof basis functions caused an increase of approximately 1 dB ofmodel error and adjacent channel power ratio.
Place, publisher, year, edition, pages
2014. 833-836 p.
Digital pre distortion (DPD), MIMO power ampli- fiers, LASSO, basis pursuit, power amplifier linearization.
Electrical Engineering, Electronic Engineering, Information Engineering Communication Systems
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-154563OAI: oai:DiVA.org:kth-154563DiVA: diva2:757766
44th European Microwave Conference,Roma, Italy on October 5-10, 2014
QC 201411172014-10-232014-10-232015-05-26Bibliographically approved