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Title: Generalized rational functions for reduced-complexity behavioral modeling and digital predistortion of broadband wireless transmitters
Authors: Rawat, Meenakshi
Rawat, Karun
Ghannouchi F.M.
Bhattacharjee S.
Leung H.
Published in: IEEE Transactions on Instrumentation and Measurement
Abstract: In this paper, we present and analyze rational-function-based digital predistortion (DPD) of transmitters for broadband applications where system noise and prominent memory effects contribute to the overall nonlinearity of the system. The performance is reported for simulation and measured results for gallium nitride (GaN)-based class-AB and laterally diffused MOS (LDMOS)-based Doherty power amplifiers (PAs) using three different wideband code division multiple access signals with peak-to-average-power ratios of around 10 dB. The performance of the proposed model, in terms of normalized mean-square error, adjacent channel power ratio, matrix condition number, and coefficient dispersion, is compared against those of a memory polynomial (MP) model and a previously proposed rational-function-based model. It is shown by simulation and measurement that the previously proposed absolute-term denominator rational functions have limitations in the inverse modeling needed for DPD. A new variation of the rational function is proposed to alleviate this limitation. Depending on the type of PA and signals, a floating-point operation reduction of 8%-38% is reported as compared with a low-complexity MP model. © 2013 IEEE.
Citation: IEEE Transactions on Instrumentation and Measurement (2014), 63(2): 485-498
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers Inc.
Keywords: 3G mobile communication
Adaptive filters
Digital signal processing
Nonlinear dynamical systems
ISSN: 189456
Author Scopus IDs: 35339866500
Author Affiliations: Rawat, M., University of Calgary, AB T2N1N4, Canada
Rawat, K., Indian Institute of Technology, Delhi 110 001, India
Ghannouchi, F.M., University of Calgary, AB T2N1N4, Canada
Bhattacharjee, S., SNC Lavalin TandD, Calgary, AB T2B 3G4, Canada
Leung, H., University of Calgary, AB T2N1N4, Canada
Appears in Collections:Journal Publications [ECE]

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