Digital Predistortion for Multi-Antenna Transmitters Affected by Antenna Crosstalk
Artikel i vetenskaplig tidskrift, 2018

In this paper, a digital predistortion (DPD) technique for wideband multi-antenna transmitters is proposed. The proposed DPD compensates for the combined effects of power amplifier (PA) nonlinearity, antenna crosstalk and impedance mismatch. The proposed technique consists of a linear crosstalk and mismatch model block shared by all transmit paths, and a dual-input DPD block in every transmit path. By avoiding the use of multi-input DPD blocks in every transmit path, the complexity of the proposed technique is kept low and scales more favorably with the number of antennas than competing techniques. It is shown that all blocks can be identified from measurements of the PA output signals using least-squares estimation. Measurement results of a four-path transmitter are presented and used to evaluate the proposed DPD technique against existing techniques. The results show that the performance of the proposed DPD technique is similar to those of existing techniques, while the complexity is lower.

power amplifier linearization

MIMO

digital predistortion

antenna crosstalk

multi-antenna transmitter

Författare

Katharina Hausmair

Chalmers, Elektroteknik, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Per Landin

Ericsson AB

Ulf Gustavsson

Ericsson AB

Christian Fager

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Thomas Eriksson

Chalmers, Elektroteknik, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 66 1524-1535

Styrkeområden

Informations- och kommunikationsteknik

Nanovetenskap och nanoteknik

Ämneskategorier

Kommunikationssystem

Signalbehandling

DOI

10.1109/TMTT.2017.2748948