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Ylva Jung

Background

I was born in Stockholm in 1984 and is currently a Ph.D. student at the Division of Automatic Control at the Department of Electrical Engineering, Linköping University.

I started my Ph.D. studies after completing her M.Sc. degree in Applied Physics and Electrical Engineering, International (Yi) at Linköping University. The third year of Yi studies was spent in Grenoble, France, at the Institut National Polytechnique de Grenoble (INPG) / École Nationale Supérieure d'Ingénieurs Électriciens de Grenoble (ENSIEG).

In September 2013 I defended my Licentiate thesis Estimation of Inverse Models Applied to Power Amplifier Predistortion.

Research

In my research, I investigate various ways to model inverse systems by use of measured data (system identification).

One application of inverse systems is precompensation of power amplifiers. Power amplifiers are used in many applications, such as communication devices, and should amplifiy a signal during the transmission of information. In mobile phones, a voice can be the signal that should be transmitted from the phone via the air to the receiver. Due to imperfections in for example the production of the power amplifiers, they risk spreading power to neighboring frequency bands. This will be noise for anyone transmitting in these bands, and there are limits to how much spreading is allowed. The imperfections and distortions of the power amplifier can be modelled using system identidication. If this error model can be inverted, one knows how to adapt the input signal to obtain a system that does not spread the power in the frequency band. This is called predistortion.

Predistortion has been applied to a nonlinear power amplifier, called outphasing power amplifier. Nonlinear power amplifiers can be made more power efficient than linear structures, which is reflected in the battery time of for example a mobile phone. Different methods have been evaluated in measurements and show that the distortions can be reduced by use of predistortions.

See also Research.

Teaching

I have been a teaching assistant in a number of basic and advanced courses as well as laboratory supervision in various courses. I have also been involved in project courses and supervised a number of Master's Theses. For a complete list of teaching and theses, see Teaching and Supervised Theses.

Ylva Jung

PhD Student in Automatic Control

(Swedish: Doktorand i reglerteknik)

Phone:
+46 13 28 40 58
Mobile (private):
+46 70 601 65 75
E-mail:
ylvju@isy.liu.se
Address:
Dept. of Electrical Engineering
Linköping University
SE-581 83 Linköping
Sweden
Visiting Address:
Campus Valla
Building B
Room 2A:581 (in the A corridor on the ground floor between entrance 23 and 25)


Page responsible: Ylva Jung
Last updated: 2015-07-20