An Efficient Method to Study the Tradeoff Between Power Amplifier Efficiency and Digital Predistortion Complexity

This letter proposes a method to study the tradeoff between the power amplifier (PA) power efficiency and the corresponding digital predistortion (DPD) model complexity needed for its linearization. The linearization performance estimated with the adjacent channel power ratio (ACPR) is treated as a control variable. In order to study at different PA operating points (OPs), an algorithm is proposed to trace approximate Pareto fronts of the ACPR versus the DPD model number of coefficients. Crest factor reduction is applied when the backoff of the OP is less than the peak-to-average power ratio (PAPR) of the long-term evolution (LTE) signal. Experimental results on a PA with an LTE signal give interesting insights on the relationship between DPD complexity and PA power efficiency.

[1]  Jaehyeong Kim,et al.  A Generalized Memory Polynomial Model for Digital Predistortion of RF Power Amplifiers , 2006, IEEE Transactions on Signal Processing.

[2]  Jérôme David,et al.  Power consumption trade-off between power amplifier OBO, DPD, and clipping and filtering , 2014, 2014 26th International Teletraffic Congress (ITC).

[3]  Ming Wang,et al.  Calculating Complete and Exact Pareto Front for Multiobjective Optimization: A New Deterministic Approach for Discrete Problems , 2013, IEEE Transactions on Cybernetics.

[4]  Caroline Lelandais-Perrault,et al.  Impacts of Crest Factor Reduction and Digital Predistortion on Linearity and Power Efficiency of Power Amplifiers , 2019, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  Olivier Venard,et al.  A Novel Algorithm for Determining the Structure of Digital Predistortion Models , 2018, IEEE Transactions on Vehicular Technology.

[6]  Christian Fager,et al.  A Comparative Analysis of the Complexity/Accuracy Tradeoff in Power Amplifier Behavioral Models , 2010, IEEE Transactions on Microwave Theory and Techniques.

[7]  A. Zhu,et al.  Dynamic Deviation Reduction-Based Volterra Behavioral Modeling of RF Power Amplifiers , 2006, IEEE Transactions on Microwave Theory and Techniques.

[8]  A. Zhu.  Decomposed Vector Rotation-Based Behavioral Modeling for Digital Predistortion of RF Power Amplifiers , 2015, IEEE Transactions on Microwave Theory and Techniques.

[9]  Karl Freiberger,et al.  Competitive Linearity for Envelope Tracking: Dual-Band Crest Factor Reduction and 2D-Vector-Switched Digital Predistortion , 2018, IEEE Microwave Magazine.