Publication detail

Digital Predistortion With Advance/Delay Neural Network and Comparison With Volterra Derived Models

GÖTTHANS, T. BAUDOIN, G. MBAYE, A.

Original Title

Digital Predistortion With Advance/Delay Neural Network and Comparison With Volterra Derived Models

English Title

Digital Predistortion With Advance/Delay Neural Network and Comparison With Volterra Derived Models

Type

conference paper

Language

en

Original Abstract

This paper is focused on digital predistortion using neural networks (NNETs) for linearization of power amplifiers. We propose a new architecture of NNET. It is based on a feedforward tapped delay line neural network for complex signals with one hidden layer but it includes both delayed and advanced samples at its input. We name this architecture TADNN (tapped advance and delay line neural net). We show that the introduction of advance taps improves the digital predistortion (DPD) performance. We also compare the TADNN predistorter with predistorters derived from Volterra series such as memory polynomial or dynamic deviation reduction models. This comparison is based on three elements: performance in linearization, complexity, increase of the peak to average power ratio (PAPR) by the predistorter. Indeed, one drawback of Volterra based predistorters is that they can generate predistorted signals with very high PAPR that cannot be applied directly at the input of the power amplifier. Conversely, the PAPR of the predistorted signals at the output of the TADNN remains moderate. The presented approach is evaluated on a real LDMOS (laterally diffused metal oxide semiconductor) push-pull power amplifier with 16 MHz bandwidth OFDM (orthogonal frequency-division multiplex) signal at a carrier frequency of 200 MHz.

English abstract

This paper is focused on digital predistortion using neural networks (NNETs) for linearization of power amplifiers. We propose a new architecture of NNET. It is based on a feedforward tapped delay line neural network for complex signals with one hidden layer but it includes both delayed and advanced samples at its input. We name this architecture TADNN (tapped advance and delay line neural net). We show that the introduction of advance taps improves the digital predistortion (DPD) performance. We also compare the TADNN predistorter with predistorters derived from Volterra series such as memory polynomial or dynamic deviation reduction models. This comparison is based on three elements: performance in linearization, complexity, increase of the peak to average power ratio (PAPR) by the predistorter. Indeed, one drawback of Volterra based predistorters is that they can generate predistorted signals with very high PAPR that cannot be applied directly at the input of the power amplifier. Conversely, the PAPR of the predistorted signals at the output of the TADNN remains moderate. The presented approach is evaluated on a real LDMOS (laterally diffused metal oxide semiconductor) push-pull power amplifier with 16 MHz bandwidth OFDM (orthogonal frequency-division multiplex) signal at a carrier frequency of 200 MHz.

Keywords

PAPR reduction; Linearization; predistortion; power amplifier; neural network; delay; advance

RIV year

2014

Released

02.09.2014

Location

Washington D.C., USA

ISBN

978-1-4673-6235-1

Book

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

Pages from

1

Pages to

5

Pages count

5

BibTex


@inproceedings{BUT109616,
  author="Tomáš {Götthans} and Geneviéve {Baudoin} and Amadou {Mbaye}",
  title="Digital Predistortion With Advance/Delay Neural Network and Comparison With Volterra Derived Models",
  annote="This paper is focused on digital predistortion using neural networks (NNETs) for linearization of power amplifiers. We propose a new architecture of NNET. It is based on a feedforward tapped delay line neural network for complex signals with one hidden layer but it includes both delayed and advanced samples at its input. We name this architecture TADNN (tapped advance and delay line neural net). We show that the introduction of advance taps improves the digital predistortion (DPD) performance. We also compare the TADNN predistorter with predistorters derived from Volterra series such as memory polynomial or dynamic deviation reduction models. This comparison is based on three elements: performance in linearization, complexity, increase of the peak to average power ratio (PAPR) by the predistorter. Indeed, one drawback of Volterra based predistorters is that they can generate predistorted signals with very high PAPR that cannot be applied directly at the input of the power amplifier. Conversely, the PAPR of the predistorted signals at the output of the TADNN remains moderate. The presented approach is evaluated on a real LDMOS (laterally diffused metal oxide semiconductor) push-pull power amplifier with 16 MHz bandwidth OFDM (orthogonal frequency-division multiplex) signal at a carrier frequency of 200 MHz.",
  booktitle="IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC",
  chapter="109616",
  howpublished="online",
  year="2014",
  month="september",
  pages="1--5",
  type="conference paper"
}