High Power Amplifier Linearization Using Zernike Polynomials in a LTE Transmission

Digital predistortion (DPD) is a highly cost- effective technique to linearize high power amplifiers (HPAs) in wireless applications. The polynomial-type behavioral models are widely used both for HPAs and predistorters, but they often suffer from the numerical instability when high order nonlineari...

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Bibliographic Details
Main Authors: Aladrén, Leticia, García-Dúcar, Paloma, Carro, P. L., de Mingo, J., Sánchez-Pérez, César
Format: Conference Proceeding
Language:English
Subjects:
Computational modeling
Linearity
Mathematical model
Numerical models
Polynomials
Power generation
Predistortion
Online Access:Request full text
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Summary:Digital predistortion (DPD) is a highly cost- effective technique to linearize high power amplifiers (HPAs) in wireless applications. The polynomial-type behavioral models are widely used both for HPAs and predistorters, but they often suffer from the numerical instability when high order nonlinearities are included. In this paper, we propose a new polynomial predistorter model considering the use of a orthogonal polynomial model based on a Zernike polynomial basis which is very robust and stable when classical identification techniques are applied. Computer simulations in a LTE uplink transmission confirm the predistorter computed with the Zernike polynomial model provides improvements in adjacent channel leakage ratio (ACLR) with stability and moderate complexity in the DPD coefficient estimation.
ISSN:1090-3038
2577-2465
DOI:10.1109/VTCFall.2012.6398969