Linearization of RF power amplifiers using an enhanced memory polynomial predistorter

Radio frequency power amplifiers (PAs) play a key-role in transceivers for mobile communications and their linearity is a crucial aspect. In order to meet the linearity requirements dictated by the standard at a reasonable efficiency, the usage of a linearization technique is required. In this paper...

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Bibliographic Details
Main Authors: Tafuri, F. F., Guaragnella, C., Fiore, M., Larsen, T.
Format: Conference Proceeding
Language:English
Subjects:
digital predistortion
gallium nitride (GaN)
linearization
memory effects
memory polynomial
Modulation
power amplifier
Predistortion
Q measurement
Radio frequency
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Summary:Radio frequency power amplifiers (PAs) play a key-role in transceivers for mobile communications and their linearity is a crucial aspect. In order to meet the linearity requirements dictated by the standard at a reasonable efficiency, the usage of a linearization technique is required. In this paper we propose a linearization by means of a new type of digital predistorter, defined directly in the I-Q domain. The architecture of the proposed predistorter can be understood as an enhancement of the memory polynomial model (MPM) by means of additional I-Q terms. The usage of the proposed predistorter allows a more robust linearization of the whole RF transmitter because the enhancement of the model with additional I-Q terms can guarantee a more versatile compensation which is beneficial when the distortion comes from the joint contribution of the PA and the quadrature modulator. The proof of concept is achieved by measurements on a commercial PA in GaN technology and the performance of the proposed predistorter is illustrated.
DOI:10.1109/NORCHP.2012.6403124