Publication detail

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

GÖTTHANS, T. BAUDOIN, G. MBAYE, A.

Original Title

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

English Title

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Type

conference paper

Language

en

Original Abstract

Power amplifier is an essential component in communication systems. Digital baseband predistortion is a cost effective approach to linearize a power amplifier. Linearization of the power amplifiers is done by using a digital predistortion calculated from a pair of time aligned signals. In the indirect approach of calculating the predistortion, these two signals are input and output of the power amplifier converted to baseband. This paper analyzes the influence of the accuracy of the timing of these signals on the performance of the predistorter. We consider the case of an integer and a fractional lag (less than the sampling period). We show that for a predistorter without memory, even for a very small fractional offset degrades performance very significantly. The introduction of memory in the predistorter compensates for the imperfect synchronization. The experiments are performed on data measured on a Doherty power amplifier for UHF DVB-T TV broadcasting. Therefore the method is evaluated on real measured power amplifier.

English abstract

Power amplifier is an essential component in communication systems. Digital baseband predistortion is a cost effective approach to linearize a power amplifier. Linearization of the power amplifiers is done by using a digital predistortion calculated from a pair of time aligned signals. In the indirect approach of calculating the predistortion, these two signals are input and output of the power amplifier converted to baseband. This paper analyzes the influence of the accuracy of the timing of these signals on the performance of the predistorter. We consider the case of an integer and a fractional lag (less than the sampling period). We show that for a predistorter without memory, even for a very small fractional offset degrades performance very significantly. The introduction of memory in the predistorter compensates for the imperfect synchronization. The experiments are performed on data measured on a Doherty power amplifier for UHF DVB-T TV broadcasting. Therefore the method is evaluated on real measured power amplifier.

Keywords

power amplifier, linearization, modeling

RIV year

2013

Released

16.06.2013

Location

Gdynia

ISBN

978-83-63578-00-8

Book

20th International Conference Mixed design of integrated circuits and systems MIXDES (2013)

Pages from

245

Pages to

248

Pages count

4

BibTex


@inproceedings{BUT100393,
  author="Tomáš {Götthans} and Genevieve {Baudoin} and Amadou {Mbaye}",
  title="Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers",
  annote="Power amplifier is an essential component in communication systems. Digital baseband predistortion is a cost effective approach to linearize a power amplifier. Linearization of the power amplifiers is done by using a digital predistortion calculated from a pair of time aligned signals. In the indirect approach of calculating the predistortion, these two signals are input and output of the power amplifier converted to baseband. This paper analyzes the influence of the accuracy of the timing of these signals on the performance of the predistorter. We consider the case of an integer and a fractional lag (less than the sampling period). We show that for a predistorter without memory, even for a very small fractional offset degrades performance very significantly. The introduction of memory in the predistorter compensates for the imperfect synchronization. The experiments are performed on data measured on a Doherty power amplifier for UHF DVB-T TV broadcasting. Therefore the method is evaluated on real measured power amplifier.",
  booktitle="20th International Conference Mixed design of integrated circuits and systems MIXDES (2013)",
  chapter="100393",
  howpublished="print",
  year="2013",
  month="june",
  pages="245--248",
  type="conference paper"
}