Linearization of Active Array Transmitters Under Crosstalk via Over-the-Air Observations
Fernandez, Joel; Anttila, Lauri; Valkama, Mikko; Eriksson, Thomas (2023)
Fernandez, Joel
Anttila, Lauri
Valkama, Mikko
Eriksson, Thomas
European Signal Processing Conference, EUSIPCO
2023
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202401031037
https://urn.fi/URN:NBN:fi:tuni-202401031037
Kuvaus
Peer reviewed
Tiivistelmä
Finding computationally feasible solutions to linearize active antenna array transmitters is a timely challenge in modern cellular networks, particularly in 5G and the emerging 6G systems. In this paper, we propose a new modeling and parameter estimation approach to characterize the individual power amplifier (PA) units of an active antenna array subject to crosstalk while relying only on over-the-air observations. Additionally, we describe a beam-sweeping based forward model learning procedure and the corresponding closed-loop digital predistortion (DPD) learning algorithm, to efficiently linearize millimeter-wave phased-array transmitters under crosstalk-induced load modulation. The provided numerical results demonstrate excellent parameter estimation and linearization performance, reaching adjacent channel power ratios (ACPRs) as low as -50 to -60 dB with realistic evaluation assumptions.
Kokoelmat
- TUNICRIS-julkaisut [17085]