Closed-loop sign algorithms for low-complexity digital predistortion

Tutkimustuotos: Conference contributionScientificvertaisarvioitu

2 Sitaatiot (Scopus)
2 Lataukset (Pure)

Abstrakti

In this paper, we study digital predistortion (DPD) based linearization with specific focus on millimeter wave (mmW) active antenna arrays. Due to the very large channel bandwidths and beam-dependence of nonlinear distortion in such systems, we propose a closed-loop DPD learning architecture, look-up table (LUT) based memory DPD models, and low-complexity sign-based estimation algorithms, such that even continuous DPD learning could be technically feasible. To this end, three different learning algorithms - sign, signed regressor, and sign-sign - are formulated for the LUT-based DPD models, such that the potential rank deficiencies, experienced in earlier methods, are avoided. Then, extensive RF measurements utilizing a state-of-the-art mmW active antenna array system at 28 GHz are carried out and reported to validate the methods. Additionally, the processing and learning complexities of the considered methods are analyzed, which together with the measured linearization performance figures allow to assess the complexity-performance tradeoffs. Overall, the results show that efficient mmW array linearization can be obtained through the proposed methods.

AlkuperäiskieliEnglanti
OtsikkoIMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
KustantajaIEEE
Sivut841-844
Sivumäärä4
ISBN (elektroninen)9781728168159
DOI - pysyväislinkit
TilaJulkaistu - elokuuta 2020
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaIEEE/MTT-S International Microwave Symposium - Virtual, Los Angeles, Yhdysvallat
Kesto: 4 elokuuta 20206 elokuuta 2020

Julkaisusarja

NimiIEEE MTT-S International Microwave Symposium Digest
Vuosikerta2020-August
ISSN (painettu)0149-645X

Conference

ConferenceIEEE/MTT-S International Microwave Symposium
Maa/AlueYhdysvallat
KaupunkiVirtual, Los Angeles
Ajanjakso4/08/206/08/20

Julkaisufoorumi-taso

  • Jufo-taso 1

!!ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Sormenjälki

Sukella tutkimusaiheisiin 'Closed-loop sign algorithms for low-complexity digital predistortion'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

Siteeraa tätä