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Analysis of Digital Predistortion in a Wideband Arbitrary Waveform Generator
Linköping University, Department of Electrical Engineering, Communication Systems.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Analys av digital predistorsion i en bredbandig signalgenerator (Swedish)
Abstract [en]

Digital predistortion is a signal processing technique used to remove undesired distortions caused by nonlinear system effects. This method is predominately used to linearize power amplifiers in communication systems in order to achieve efficient transmitter circuits. However, the technique can readily be applied to cancel undesired nonlinear behavior in other types of systems.

This thesis investigates the effectiveness of digital predistortion in the context of a wideband arbitrary waveform generator. A theoretical foundation discussing nonlinear system models, predistortion architectures and system identification methods is complemented with a simulation study and followed by verification on a real system.

The best predistorter is able to fully suppress the undesired distortions for any fixed two-tone sinusoidal signal. Furthermore, the results indicate the existence of a wideband predistorter which yield acceptable suppression over a frequency range of several hundred MHz.

Abstract [sv]

Digital predistorsion är en signalbehandlingsteknik som används för att undertrycka oönskade distorsioner orsakade av icke-linjära effekter i elektriska system. Denna metod används i huvudsak för att linjärisera effektförstärkare i kommunikationssystem för att erhålla effektiva sändarkedjor men tekniken kan utan större problem även tillämpas på andra typer av icke-linjära system.

Denna uppsats undersöker i vilken utsräckning digital predistorsion kan användas för att undertrycka oönskade signaldistorsioner i en bredbandig signalgenerator. Uppsatsen presenterar en bakgrund som utgår ifrån teorin om icke-linjära systemmodeller, arkiteturer för predistorsion och systemidentifieringsmetoder. En kvantitativ studie i en simuleringsmiljö åtföjs av en utvärdering på ett verkligt system.

Det bästa predistorsionssystemet åstadkommer en fullständig linjärisering i testfallet med en fix tvåtonssignal. Resultaten indikerar även att det existerar ett system som linjäriserar signaler i ett frekvensområde som uppgår till hundratals MHz.

Place, publisher, year, edition, pages
2015. , 100 p.
Keyword [en]
Digital Predistortion, Nonlinear Systems, Linearization, Inverse System Estimation
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-123410ISRN: LiTH-ISY-EX--15/4909--SEOAI: oai:DiVA.org:liu-123410DiVA: diva2:897079
External cooperation
Signal Processing Devices Sweden AB
Subject / course
Communication Systems
Supervisors
Examiners
Available from: 2016-01-26 Created: 2015-12-15 Last updated: 2016-01-26Bibliographically approved

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CiteExportLink to record
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