Decomposed Vector Rotation Model Sizing by Hill-Climbing Heuristic for Digital Predistortion of RF Power Amplifiers

Kantana, Chouaib; Venard, Olivier; Baudoin, Geneviève

doi:10.1109/pawr46754.2020.9035996

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The DVR model has been sized to find its optimal structure using the HC algorithm proposed in [38]. The indirect learning architecture (ILA), presented in Fig.…”

Section: Dpd Linearizationmentioning

confidence: 99%

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A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

Kantana

Benosman

et al. 2023

IEEE J. Microw.

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In this paper, we propose an efficient system approach to improve the power efficiency of dual-input Doherty power amplifier (DIDPA) with maintaining its linearity level. An auto-tuning process based on a hybrid heuristic search control (HHSC) is applied to optimally define DIDPA configuration by optimizing its free parameters. Digital predistortion (DPD) is then integrated to linearize DIDPA using an optimal reduced-complexity model based on the segmentation approach. An optimal pruning process of the free parameters, based on hill-climbing (HC) heuristics, is proposed to reduce the HHSC complexity in order to refine the optimal DIDPA configuration. The system approach has been approved by experimental results, in different scenarios, using an LTE 20 MHz signal with a PAPR of 8 dB. DPD linearization under optimal DIDPA configuration improved linearity using a low-complex model with only 30 coefficients, which exhibited an error vector magnitude (EVM) of 2.5% and an adjacent channel power ratio (ACPR) of −50 dB at an averaged output power of 34 dBm. By updating the cost function coefficients and pruning the free parameters, DIDPA exhibited an EVM of 3%, an ACPR of −50 dB, and a drain efficiency of 47% at an average output power of 39 dBm.

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“…The DVR model has been sized to find its optimal structure using the HC algorithm proposed in [38]. The indirect learning architecture (ILA), presented in Fig.…”

Section: Dpd Linearizationmentioning

confidence: 99%

“…In this study, the neighborhood definition is inspired by the proposed one for the DVR model in [38]. The vector consists of 6 free parameters: [μ α φ ψ V GS,m V GS,p ].…”

Section: E Optimal Pruning Of Free Parameters In Hhscmentioning

confidence: 99%

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

Kantana

Benosman

et al. 2023

IEEE J. Microw.

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show abstract

“…Indeed in (8) there are 6 elementary types of basis functions, but may be some of them are not usefull and some other could be added. In [66] we have proposed an algorithm based on hill-climbing heuristic for the sizing of DVR models. This algorithm searches for a structure that optimizes a trade-off between the number of coefficients of the model and its modeling accuracy.…”

Section: Decomposed Vector Rotation Dvr-dpdmentioning

confidence: 99%

On Segmented Predistortion for Linearization of RF Power Amplifiers

Baudoin¹

2020

RADIOENGINEERING

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This paper presents a general survey of digital predistortion (DPD) techniques with segmentation. A comparison of global DPD with two segmented approaches namely Vector-Switched DPD and Decomposed Vector Rotation DPD is presented with the support of experimentation on a strongly non-linear 3 ways Doherty PA. It shows the interest of both segmented approaches in terms of linearization performance, complexity and ease of implementation compared to the global DPD. The paper starts with some mathematical generalities on interpolation and splines. It focuses on segmented models derived from Volterra series even if the presented principles can also be applied to neural networks.

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A Hybrid Heuristic Search Control Assisted Optimization of Dual-Input Doherty Power Amplifier

Kantana

Benosman

et al. 2022

2021 51st European Microwave Conference (EuMC)

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Decomposed Vector Rotation Model Sizing by Hill-Climbing Heuristic for Digital Predistortion of RF Power Amplifiers

Cited by 3 publications

References 7 publications

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

On Segmented Predistortion for Linearization of RF Power Amplifiers

A Hybrid Heuristic Search Control Assisted Optimization of Dual-Input Doherty Power Amplifier

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