Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F13%3APU104173" target="_blank" >RIV/00216305:26220/13:PU104173 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Influence of Delay Mismatch on Digital Predistortion for Power Amplifiers

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

JA - Elektronika a optoelektronika, elektrotechnika

OECD FORD obor

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Projekt

<a href="/cs/project/ED2.1.00%2F03.0072" target="_blank" >ED2.1.00/03.0072: Centrum senzorických, informačních a komunikačních systémů (SIX)</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

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

ISBN

978-83-63578-00-8

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

245-248

Název nakladatele

Neuveden

Místo vydání

Gdynia

Místo konání akce

Gdynia

Datum konání akce

20. 6. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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