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OTA-Based Data Acquisition and Signal Separation for Digital Predistortion of Multi-User MIMO Transmitters in 5G
Author(s)
Date Issued
2020-08-06
Date Available
2020-11-06T15:57:14Z
Abstract
In this paper, a non-interruptive over-the-air (OTA) data acquisition method is presented to characterize system nonlinearity and calibrate digital predistortion (DPD) in multi-user (MU) multiple-input multiple-output (MIMO) transmitters with low hardware complexity. Based on a unified system model for fully-digital and hybrid MU-MIMO transmitters, the requirements and difficulties of data acquisition for MU-MIMO DPD are outlined first. A versatile OTA data acquisition technique, featuring a multi-observation forward modelling procedure, is thereby developed to obtain power amplifier (PA) output without interrupting the operation of the MIMO transmitters. By using this method, the output of each PA can be reconstructed instead of directly measuring each PA's output, even when the output signals of PAs are correlated. DPD can therefore be effectively constructed to mitigate the distortion. Experimental results demonstrate that the proposed approach can accurately estimate each PA output and linearize all PAs in the array.
Sponsorship
Science Foundation Ireland
Other Sponsorship
National Natural Science Foundation of China
Type of Material
Conference Publication
Publisher
IEEE
Copyright (Published Version)
2020 IEEE
Language
English
Status of Item
Peer reviewed
Part of
2020 IEEE/MTT-S International Microwave Symposium (IMS)
Conference Details
International Microwave Symposium (IMS), Los Angeles, CA, USA, 4-6 August 2020
This item is made available under a Creative Commons License
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