Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

Peng, Xuan; Qiu, Xin; Mu, Fuqi

doi:10.2528/pierm18010901

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…In this scenario, the TLP architecture can be exploited based on two different strategies. In one case, namely real-valued TLPs, the network inputs, outputs, weights and biases are restricted to be real-valued numbers [6], [18], [19]. Therefore, in realvalued TLPs, the complex-valued signals must be converted into real-valued signals.…”

Section: Tlp-based Model For Multimode Pamentioning

confidence: 99%

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Behavioral Modeling of a Multimode Power Amplifier Using Perceptrons with AM-AM and AM-PM Complex-Valued Activation Function

Freire

Schuartz²,

Santos³

et al. 2021

JICS

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Three-layer perceptron (TLP) is one of the approaches to the behavioral modeling of radio frequency (RF) power amplifiers (PAs) for wireless communication systems. A low-pass equivalent PA behavioral modeling should be able to represent the AM-AM and AM-PM characteristic curves, besides generating only useful contributions. This work shows that adapting a complex-valued activation function toencompass the strict characteristics from the AM-AM and AM-PM curves at the same time fulfilling the bandpass constraint gives better results in terms of network complexity and accuracy. Besides that, a novel TLP-based model for a multimode PA is proposed. This type of PA has characteristics that add difficulty to its inverse modeling. A modification in the ascendant method is also proposed for application with TLP-based PA models. This method simplifies the models in terms of operations needed for implementation. In a scenario of same number of network parameters, a significant reduction in modeling error is achieved when a complex-valued TLP that accounts for both AM-AM and AM-PM is used instead of a complex-valued TLP that accounts only for AM-AM. Such reduction is quantified by up to 5.73 dB (-35.53 dB to -41.26 dB) improvements in normalized mean square error (NMSE) metric. Moreover, when applying the ascendant method a 67% reduction in active parameters is achieved (36 to 12 active parameters), deteriorating the NMSE by less than 0.5 dB.

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Section: Tlp-based Model For Multimode Pamentioning

confidence: 99%

“…In bandpass systems, only contributions at the fundamental zone (in the vicinity of the carrier frequency) can be applied or measured [6]. RF PAs are a special class of bandpass systems.…”

Section: Introductionmentioning

confidence: 99%

Behavioral Modeling of a Multimode Power Amplifier Using Perceptrons with AM-AM and AM-PM Complex-Valued Activation Function

Freire

Schuartz²,

Santos³

et al. 2021

JICS

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show abstract

“…The Volterra and Fredholm functional series are a universal tool for identification and analysis of nonlinear systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In the iterative algorithms, a basic thing is the process of determining the operator of cascade of the systems described by the homogeneous operators.…”

Section: Introductionmentioning

confidence: 99%

The binary algorithm of cascade connection of nonlinear digital filters described in functional series

Siwczyński¹,

Żaba²

2019

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The article presents an example of the use of functional series for the analysis of nonlinear systems for discrete time signals. The homogeneous operator is defined and it is decomposed into three component operators: the multiplying operator, the convolution operator and the alignment operator. An important case from a practical point of view is considered -a cascade connection of two polynomial systems. A new, binary algorithm for determining the sequence of complex kernels of cascade from two sequences of kernels of component systems is presented. Due to its simplicity, it can be used during iterative processes in the analysis of nonlinear systems (e.g. feedback systems)..

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A Robust Low-Complexity Generalized Harmonic Canceling Model for Wideband RF Power Amplifiers

Chen

Qiu

Chai

et al. 2020

IEICE Trans. Fundamentals

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Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

Cited by 4 publications

References 17 publications

Behavioral Modeling of a Multimode Power Amplifier Using Perceptrons with AM-AM and AM-PM Complex-Valued Activation Function

Behavioral Modeling of a Multimode Power Amplifier Using Perceptrons with AM-AM and AM-PM Complex-Valued Activation Function

The binary algorithm of cascade connection of nonlinear digital filters described in functional series

A Robust Low-Complexity Generalized Harmonic Canceling Model for Wideband RF Power Amplifiers

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