Orthogonal Polynomials for Power Amplifier Modeling and Predistorter Design

Raich, Raviv; Qian, Hua; Zhou, G.T.

doi:10.1109/tvt.2004.832415

Cited by 286 publications

(182 citation statements)

References 18 publications

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“…This tech nique, referred as signal predistortion (DPD) is usually performed on the baseband version of the signal and it is often based on polynomial functions [1,2,3,4,5] or look up tables (LUT) [6,7]. While liter ature mostly focuses on terrestrial applications, signal predistortion techniques are also becoming popular in satellite communications [8] partly due to the move towards amplification of multiple carriers (or multicarrier signals) in a single wideband HPA for reducing the payload mass and mission costs.…”

Section: Introductionmentioning

confidence: 99%

Generalized direct predistortion with adaptive crest factor reduction control

Piazza

Shankar

Ottersten

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Efficient power amplification is inherently a non linear operation that introduces unwanted interference in the amplified signal. Strong inter-symbol interference is generated when the amplifier non linear ity is combined with channel memory effects. Further, signals with very high peak to average power ratio, typical of multiple carrier sys tems, are even more sensitive to the non linearities resulting in severe distortion effects. Signal pre-clipping (crest factor reduction) and predistortion are conventional countermeasure techniques to reduce the generated non linear distortion and improve power and spectral efficiency. In this work, novel optimization methods for predistor tion and pre-clipping are analytically derived for a general non-linear communication channel with memory. A combined architecture in which crest factor reduction is followed by signal predistortion is proposed and the parameters are estimated resorting to iterative al gorithms based on least squares method. Performance evaluation of the estimation techniques shows the effectiveness of the derived algorithms and significant gain compared to previously known meth ods.

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Section: Introductionmentioning

confidence: 99%

Generalized direct predistortion with adaptive crest factor reduction control

Piazza

Shankar

Ottersten

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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“…The power amplifier is the major source of nonlinearity in a communication system. To increase their efficiency, power amplifiers are sometimes driven into their nonlinear region [1], thus causing spectral regrowth, increasing bit error rate, interference to adjacent channel, and intermodulation products to be generated. In extreme these IM products can interfere with signals that are being amplifies [2].…”

Section: Introductionmentioning

confidence: 99%

“…Result of our simulation in compare with analytical expression (with or without considering frequency effect) for IM 1,3,5 (phase and amplitude) are plotted in Figures 2-4. In all figures, diagrams that frequency effect isconsidered in their a 2n+1 coefficients (blue), show better fit to simulated results (red) than the other one (green).…”

mentioning

confidence: 99%

“…In Equations (8) and (11), it is obvious that every coefficient related to one type of nonlinearity or are the dominate factor in them. For example a 1 is the dominate factor in IM 1 . It shows that little variation in its value makes huge change in predicting IM 1 .…”

mentioning

confidence: 99%

“…For example a 1 is the dominate factor in IM 1 . It shows that little variation in its value makes huge change in predicting IM 1 . Without any doubt, errors that occurred in fitting make some errors in calculating …”

mentioning

confidence: 99%

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Estimation of Intermodulation Rejection Value as a Function of Frequency in Power Amplifier Using AM-AM and AM-PM Diagrams Based on Power Series Analysis

Kashi

Kamarei²,

Javadi³

2012

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A method to predict intermodulation (IM) products of two tone test based on Amplitude to amplitude (AM-AM) and amplitude to phase (AM-PM) diagrams of power amplifier is proposed in this paper. An RF power amplifier is mathematically modeled by a power series in order of 13. Coefficients of the transfer function are obtained by odd-order polynomial fitting of the transfer function of the power amplifier that is modeled by power series, with AM-AM and AM-PM diagrams. Because of considering AM-PM distortion, coefficients have become complex. By using this transfer function, analytical expressions of IM products are derived. Frequency effect of IM products are modeled in suggested method to estimate the effects of changing in input frequency on output. With the mean of this factor the model is able to predict IM products of wideband frequency input. Simulated results agree well with the predicted method in comparisons.

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Digital Predistortion for Microwave Transmitters

Ghannouchi

Hammi

Helaoui

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Microwave transmitters comprise the cascade of several subsystems. Among these subsystems, the power amplifier (PA) is identified to be the main source of nonlinearity. Thus, modeling and compensating for the transmitter nonlinearity is often trimmed down to the modeling and compensation of the power amplifier's nonlinearity. Such compensation allows for the use of power‐efficient and nonlinear PA topologies, which results in reducing the energy consumption and cost of wireless transmitters. This article gives an overview of the nonlinear PA behavior and the origins of intermodulation distortions in this subsystem. It defines the most used distortion quantification metrics and the different types of distortions. Power amplifier modeling and digital predistortion principles are explained. The procedure and identification steps of digital predistortion are highlighted, and the different models used in digital predistortion technique are covered. Advanced digital predistortion models for linearizing the impairments in multiple‐input–multiple‐output (MIMO) PAs, dual‐band PAs, and quadrature modulators are also covered.

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Orthogonal Polynomials for Power Amplifier Modeling and Predistorter Design

Cited by 286 publications

References 18 publications

Generalized direct predistortion with adaptive crest factor reduction control

Generalized direct predistortion with adaptive crest factor reduction control

Estimation of Intermodulation Rejection Value as a Function of Frequency in Power Amplifier Using AM-AM and AM-PM Diagrams Based on Power Series Analysis

Digital Predistortion for Microwave Transmitters

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