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Recursive learning-based joint digital predistorter for power amplifier and I/Q modulator impairments

Published online by Cambridge University Press:  01 July 2010

Lauri Anttila ,
Peter Händel ,
Olli Mylläri  and
Mikko Valkama
Lauri Anttila*
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland. Phone: +358-3-31155127; Fax: +358-3-31153808.
Peter Händel
Affiliation:
Royal Institute of Technology, ACCESS Linnaeus Center, Signal Processing Lab, Stockholm, Sweden.
Olli Mylläri
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland. Phone: +358-3-31155127; Fax: +358-3-31153808.
Mikko Valkama
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland. Phone: +358-3-31155127; Fax: +358-3-31153808.
*
Corresponding author: L. Anttila Email: [email protected]
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Abstract

The main implementation impairments degrading the performance of direct-conversion radio transmitters are in-phase/quadrature (I/Q) mismatch, local oscillator (LO) leakage, and power amplifier (PA) nonlinear distortion. In this article, we propose a recursive least-squares-based learning algorithm for joint digital predistortion (PD) of frequency-dependent PA and I/Q modulator impairments. The predistorter is composed of a parallel connection of two parallel Hammerstein (PH) predistorters and an LO leakage compensator, yielding a predistorter which as a whole is fully linear in the parameters. In the parameter estimation stage, proper feedback signal from the transmitter radio frequency (RF) stage back to the digital parts is deployed, combined with the indirect learning architecture and recursive least-squares training. The proposed structure is one of the first techniques to explicitly consider the joint estimation and mitigation of frequency-dependent PA and I/Q modulator impairments. Extensive simulation and measurement analysis is carried out to verify the operation and efficiency of the proposed PD technique. In general, the obtained results demonstrate linearization and I/Q modulator calibration performance clearly exceeding the performance of current state-of-the-art reference techniques.

Keywords

Direct-conversion radioPower amplifierSpectral regrowthI/Q imbalanceMirror-frequency interferenceLO leakageAdjacent channel interferenceDigital predistortion
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 2 , Issue 2 , April 2010 , pp. 173 - 182
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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