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Simultaneous measurement of multiple power amplifiers for phased array digital predistortion using a shared dual-output feedback

Khan, Bilal; Tervo, Nuutti; Akbar, Rehman; Leinonen, Marko E.; Kursu, Olli; Pärssinen, Aarno; Juntti, Markku (2022-06-02)

 
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https://doi.org/10.23919/eumc50147.2022.9784203

Khan, Bilal
Tervo, Nuutti
Akbar, Rehman
Leinonen, Marko E.
Kursu, Olli
Pärssinen, Aarno
Juntti, Markku
Institute of Electrical and Electronics Engineers
02.06.2022

B. Khan et al., "Simultaneous Measurement of Multiple Power Amplifiers for Phased Array Digital Predistortion Using a Shared Dual-Output Feedback," 2021 51st European Microwave Conference (EuMC), 2022, pp. 134-137, doi: 10.23919/EuMC50147.2022.9784203.

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doi:https://doi.org/10.23919/eumc50147.2022.9784203
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Abstract

Digital linearization of a phased array transmitters is usually based on feedback measurements. Various arrangements can be used to measure multiple transmit paths by using conducted or radiated methods. We propose a technique for measuring any pair of transmit paths simultaneously by using a common feedback connected to two receivers, and a cancellation method that can make the measurements independent. Together with the feedback cancellation, a single feedback line with two output ports can be used to measure different transmit chain pairs coherently under varying load conditions present in phased arrays. The cancellation filters are trained by using a fifth-generation (5G) new radio waveform and verified by over-the-air (OTA) measurements along with the predistortion performance evaluation of a 28 GHz 8-element phased array transmitter. The method achieved 30 dB cancellation between the paths and the DPD trained with the feedback cancellation achieved 4.2 % EVM and -40.8 dBc ACPR.

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