Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 66, Issue 3, Pages 1524-1535Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2017.2748948
Keywords
Antenna crosstalk; digital predistortion (DPD); multiple-input multiple-output (MIMO) transmitter; power amplifier (PA) linearization
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Funding
- Swedish Governmental Agency for Innovation Systems (VIN-NOVA)
- Chalmers University of Technology
- Ericsson
- Infineon Technologies Austria
- Ampleon
- National Instruments
- Gotmic
- Saab
- EMPIR programme
- European Union's Horizon 2020 research and innovation programme
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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.
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