liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Digital predistortion of semi-linear power amplifier
Linköping University, Department of Electrical Engineering.
2004 (English)Independent thesis Basic level (professional degree)Student thesisAlternative title
Digital predistorsion av semilineär effektförstärkare (Swedish)
Abstract [en]

In this thesis, a new way of using predisortion for linearization of power amplifiers is evaluated. In order to achieve an adequate power level for the jamming signal, power amplifiers are used in military jamming systems. Due to the nonlinear characteristic of the power amplifier, distortion will be present at the output. As a consequence, unwanted frequencies are subject to jamming. To decrease the distortion, linearization of the power amplifier is necessary.

In the system of interest, a portion of the distorted power amplifier output signal is fed back. Using this measurement, a predistortion signal is synthesized to allow suppression of the unwanted frequency components. The predistortion signal is updated a number of times in order to achieve a good outcome. Simulations are carried out in Matlab for testing of the algorithm.

The evaluation of the new linearization technique shows promising results and that good suppression of distortion components is achieved. Furthermore, new predistortion features are possible to implement, such as predistorsion in selected frequency bands. However, real hardware testing needs to be carried out to confirm the results.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2004.
Keyword [en]
Datorteknik, digital predistortion, power amplifier, nonlinearity, jammer, distortion, modelling
Keyword [sv]
National Category
Computer Engineering
URN: urn:nbn:se:liu:diva-2617ISRN: LITH-ISY-EX--04/3545--SEOAI: diva2:19953
Available from: 2005-01-03 Created: 2005-01-03

Open Access in DiVA

fulltext(518 kB)1480 downloads
File information
File name FULLTEXT01.pdfFile size 518 kBChecksum MD5
Type fulltextMimetype application/pdf

By organisation
Department of Electrical Engineering
Computer Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1480 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 745 hits
ReferencesLink to record
Permanent link

Direct link