A Dual-Input Two-Box Model for Digital Predistortion of Envelope Tracking Power Amplifiers

Hammi, Oualid; Khalifa, Mohamed O.; Abdelhafiz, Abubaker; Kwan, Andrew; Zerguine, Azzedine; Sharawi, Mohammad S.; Ghannouchi, Fadhel M.

doi:10.1109/lmwc.2016.2548984

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Several shaping functions have been proposed to shape the original envelope in the envelope generation block. N6, 16–18 Wilson 16 and power envelope tracking (PET) 19 function can make a good trade‐off between linearity and efficiency of the PA, however, the bandwidth of its corresponding envelope is fixed once the original envelope and swing range is determined. Besides, several bandwidth reduction techniques have been proposed to relieve the bandwidth requirements of the supply modulator.…”

Section: Introductionmentioning

confidence: 99%

High‐accuracy filtering‐based envelope generation and digital predistortion for wideband envelope tracking power amplifier

Chen

Zhu

et al. 2022

Int J RF Mic Comp-Aid Eng

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A high‐accuracy filtering‐based envelope generation technique for wideband envelope tracking power amplifiers (ET PAs) is proposed to improve PA efficiency with limited envelope bandwidth. It is achieved by optimizing the envelope generation block by employing three generalized rectification functions. The proposed envelope can be obtained by finding the proper coefficients in these generalized rectification functions. Furthermore, the digital predistortion can be employed to compensate for the nonlinearity and memory effect introduced by the proposed envelope. Experiments have been carried out on an ET system that is operated with the center frequency of 3.5 GHz, which have shown that the proposed technique can improve the PA efficiency by more than 2.2% with only 1.2× the modulated bandwidth compared to the state‐of‐the‐art methods. The normalized mean square error can achieve −44.8 dB, and the adjacent channel leakage ratio can achieve better than −52 dBc. The proposed technique can improve the PA efficiency with limited envelope bandwidth compared to the state‐of‐the‐art techniques, and the PA supplied by the proposed envelope can be linearized well, while it may cost more resources to find the proper coefficients of these three generalized rectification functions.

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Section: Introductionmentioning

confidence: 99%

High‐accuracy filtering‐based envelope generation and digital predistortion for wideband envelope tracking power amplifier

Chen

Zhu

et al. 2022

Int J RF Mic Comp-Aid Eng

View full text Add to dashboard Cite

show abstract

“…Before linearizing with DPD, an accurate behavioral model for PAs is necessary. There have been many models reported, such as the generalized memory polynomial (MP), decomposed vector rotation, twin nonlinear two‐box, reduced look‐up‐tables, two‐box dual‐input single‐output, and so on. However, all the above models only take care of the IMD, and as a matter of fact, the harmonic distortion is not included in the models.…”

Section: Introductionmentioning

confidence: 99%

Hybrid harmonic‐intermodulation distortion behavioral model for shortwave power amplifiers

Liu

Yan

et al. 2019

Int J RF Microw Comput Aided Eng

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In this article, a hybrid harmonic-intermodulation distortion (HHIMD) behavioral model is proposed for imitating the shortwave power amplifier (SWPA) behavioral distortion, that is, harmonic distortion, intermodulation distortion, and memory effect. The proposed model is composed of an intermodulation distortion module, a quadrature digital up-converter module and a harmonic distortion module. To demonstrate the modeling accuracy, the proposed model and measured SWPA are compared in the time domain and spectrum domain. It is shown that the proposed model can imitate the SWPA not only harmonic and intermodulation distortion, but also memory effect. The modeling normalized mean squared error between the HHIMD and measured SWPA output is lower than −44-dB.behavioral modeling, harmonic distortion, shortwave power amplifier

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“…A joint polynomial/LUT two-box model [7] separates dynamic weak nonlinearity from static strong non-linearity, effectively simplifying model complexity. The dynamic weak non-linearity is implemented by a low-order memory polynomial, while the static strong non-linearity is implemented by a LUT.…”

Section: Introductionmentioning

confidence: 99%

One-step model extraction method for joint polynomial/interpolating lookup-table two-box nonlinear model of power amplifier

Chen

Qin

Tang

2018

IEICE Electron. Express

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In this paper, a one-step model extraction method is proposed for parameter identification of two-box nonlinear model of power amplifiers. In order to simplify the extraction complexity, the Wiener and Hammersteinbased serial structure is replaced by a parallel structure. The dynamic nonlinear filter curve and the static piecewise function formed by linear interpolating LUT entry are jointly curve-fitted to identify the parameters of the two-box model in one step. Compared with the traditional two-box model extraction method, the resultant data shows a comparable linearization performance of the proposed model in suppressing the adjacent channel error power with simplified procedures.

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A Dual-Input Two-Box Model for Digital Predistortion of Envelope Tracking Power Amplifiers

Cited by 5 publications

References 6 publications

High‐accuracy filtering‐based envelope generation and digital predistortion for wideband envelope tracking power amplifier

High‐accuracy filtering‐based envelope generation and digital predistortion for wideband envelope tracking power amplifier

Hybrid harmonic‐intermodulation distortion behavioral model for shortwave power amplifiers

One-step model extraction method for joint polynomial/interpolating lookup-table two-box nonlinear model of power amplifier

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