Digital Predistorter Design Using a Reduced Volterra Model to Linearize GaN RF Power Amplifiers
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Date
2018-09
Authors
Rezgui, Haithem
Rouissi, Fatma
Ghazel, Adel
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Referee
Mark
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Společnost pro radioelektronické inženýrství
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Abstract
In this paper, a novel method for reducing a Simplified Volterra Series (SVS) model size is proposed for GaN RF Power Amplifier (PA) Digital Predistorter (DPD) design. Using the SVS-modified model, the number of coefficients needed for the PA behavioral modeling and predistortion can be reduced by 60 % while maintaining acceptable performances. Simulation and implementation tests are performed for a Class AB GaN PA and Doherty GaN PA using a 20-MHz Long Term Evolution-Advanced (LTE-A) signal. The Adjacent Channel Power Ratio (ACPR) attains -40 dB and -41 dB for the Doherty and Class AB GaN PAs, respectively. The implementation complexity is also studied and the obtained results prove the capability of the proposed model to linearize PA using 3% of the Slice LUTs and 87% of the DSP48E1 available in the Xilinx Zynq-7000 FPGA.
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Citation
Radioengineering. 2018 vol. 27, č. 3, s. 909-916. ISSN 1210-2512
https://www.radioeng.cz/fulltexts/2018/18_03_0909_0916.pdf
https://www.radioeng.cz/fulltexts/2018/18_03_0909_0916.pdf
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Peer-reviewed
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en