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Behavioral modeling and digital pre-distortion techniques for RF PAs in a 3 × 3 MIMO system

Published online by Cambridge University Press:  20 June 2019

Mahmoud Alizadeh*
Affiliation:
Department of Electrical Engineering, Mathematics and Science, University of Gävle, Gävle, Sweden Division of Information Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden
Peter Händel
Affiliation:
Division of Information Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden
Daniel Rönnow
Affiliation:
Department of Electrical Engineering, Mathematics and Science, University of Gävle, Gävle, Sweden
*
Author for correspondence: Mahmoud Alizadeh, E-mail: mahali@kth.se

Abstract

Modern telecommunications are moving towards (massive) multi-input multi-output (MIMO) systems in 5th generation (5G) technology, increasing the dimensionality of the systems dramatically. In this paper, the impairments of radio frequency (RF) power amplifiers (PAs) in a 3 × 3 MIMO system are compensated in both the time and the frequency domains. A three-dimensional (3D) time-domain memory polynomial-type model is proposed as an extension of conventional 2D models. Furthermore, a 3D frequency-domain technique is formulated based on the proposed time-domain model to reduce the dimensionality of the model, while preserving the performance in terms of model errors. In the 3D frequency-domain technique, the bandwidth of the system is split into several narrow sub-bands, and the parameters of the model are estimated for each sub-band. This approach requires less computational complexity, and also the procedure of the parameters estimation for each sub-band can be implemented independently. The device-under-test consists of three RF PAs including input and output cross-talk channels. The proposed techniques are evaluated in both behavioral modeling and digital pre-distortion (DPD) perspectives. The experimental results show that the proposed DPD technique can compensate the errors of non-linearity and memory effects in the both time and frequency domains.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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