University of Oulu

N. Tervo et al., "Digital Predistortion of Millimeter-Wave Phased Array Transmitter With Over-the-air Calibrated Simplified Conductive Feedback Architecture," 2020 IEEE/MTT-S International Microwave Symposium (IMS), Los Angeles, CA, USA, 2020, pp. 543-546, doi: 10.1109/IMS30576.2020.9224083

Digital predistortion of millimeter-wave phased array transmitter with over-the-air calibrated simplified conductive feedback architecture

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Author: Tervo, Nuutti1; Khan, Bilal1; Kursu, Olli1;
Organizations: 1University of Oulu, Faculty of Information Technology and Electrical Engineering (ITEE)
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-12-17


Digital predistortion (DPD) of a phased array requires that multiple transmit paths must be measured by a feedback (FB) receiver (Rx), This paper proposes a simplified FB architecture to be used for phased array DPD. A single FB line collects the waveform samples from the parallel paths to the FB Rx. The gain and phase of the common FB line is obtained by comparing the FB outputs to over-the-air (OTA) measurements. The overall DPD training is done by collecting the PA outputs with the common FB line, post-equalizing them to model the main lobe waveform and combining them to create the object used for array DPD. The DPD performance was verified by OTA measurements with 5GNR waveform and 28 GHz 8-path phased array transmitter. The DPD trained through the local FB line with the proposed calibration method achieved <; -45dB ACPR which was close to OTA DPD performance.

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Series: IEEE MTT-S International Microwave Symposium digest
ISSN: 0149-645X
ISSN-L: 0149-645X
ISBN: 978-1-7281-6815-9
ISBN Print: 978-1-7281-6816-6
Pages: 543 - 546
Article number: 9224083
DOI: 10.1109/IMS30576.2020.9224083
Host publication: 2020 IEEE/MTT-S International Microwave Symposium, IMS 2020, 4-6 Aug. 2020, Los Angeles, CA, USA
Conference: IEEE/MTT-S International Microwave Symposium
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been supported by Business Finland 5G-VIIMA project, Academy of Finland 6Genesis Flagship (grant no. 318927) and Infotech Oulu Doctoral Programme.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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