Detail publikace

Vliv synchronizace na linearizaci výkonového zesilovače

GÖTTHANS, T. BAUDOIN, G. MBAYE, A.

Originální název

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Český název

Vliv synchronizace na linearizaci výkonového zesilovače

Anglický název

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Typ

článek ve sborníku

Jazyk

en

Originální abstrakt

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.

Český abstrakt

Článek se zabývá vlivem śpatné synchronizace na linearizaci výkonového zesilovače. Pro modelování porovnáná několik metod na základě složitosti a schopnosti kompenzovat synchronizační vlivy. Celý systém je ověřen na reálném subsystému.

Anglický abstrakt

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.

Klíčová slova

zesilovač, linearizace, modelování

Rok RIV

2013

Vydáno

16.06.2013

Místo

Gdynia

ISBN

978-83-63578-00-8

Kniha

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

Strany od

245

Strany do

248

Strany počet

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"
}