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Closed-Loop DPD for Digital MIMO Transmitters under Antenna Crosstalk

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoConference Record - 53rd Asilomar Conference on Circuits, Systems and Computers, ACSSC 2019
ToimittajatMichael B. Matthews
KustantajaIEEE Computer Society
Sivut1682-1689
Sivumäärä8
ISBN (elektroninen)9781728143002
DOI - pysyväislinkit
TilaJulkaistu - marraskuuta 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaAsilomar Conference on Circuits, Systems and Computers -
Kesto: 3 marraskuuta 20196 marraskuuta 2019

Julkaisusarja

NimiConference Record - Asilomar Conference on Signals, Systems and Computers
Vuosikerta2019-November
ISSN (painettu)1058-6393

Conference

ConferenceAsilomar Conference on Circuits, Systems and Computers
Ajanjakso3/11/196/11/19

Tiivistelmä

Due to the closely-spaced antenna elements in largearray or massive MIMO transmitters, antenna crosstalk is inevitable. This imposes additional challenges when seeking to linearize the power amplifiers at the transmitter through digital predistortion (DPD). In the commonly applied indirect learning architecture (ILA), the antenna crosstalk is known to result in a large amount of additional basis functions (BFs) in order to account for all the coupling signal terms and achieve good linearization. In this article, we propose a novel closed-loop DPD architecture and associated parameter learning algorithms that can provide efficient linearization of digital MIMO transmitters under antenna crosstalk. The proposed solution does not need extra basis functions, and is thus shown to provide large benefits in terms of computational complexity compared to existing state-of-the-art. Comprehensive numerical results are also provided, showing excellent linearization performance outperforming the existing reference methods.

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