Johan Karlsson Postdoctoral associate, Ph.D. Spectral Analysis Lab University of Florida E-mail: jkarlsson [at] ufl [dot] edu Tel: +1-352-214-5518 Johan Karlsson received an M.Sc. degree in Engineering Physics from KTH in 2003 and a Ph.D. in Optimization and Systems Theory from KTH in 2008. From 2009 to 2011, he was with Sirius International, Stockholm. He is currently working as a postdoctoral associate at the Department of Computer and Electrical Engineering, University of Florida. His current research interests include optimization, interpolation, and model reduction for applications in signal processing and control theory.

Journal articles:

• Fast missing data IAA with application to notched spectrum SAR (with W. Rowe, L. Xu, and J. Li), submitted to IEEE Transactions on Aerospace and Electronic Systems.
• Uncertainty bounds for spectral estimation (with T. Georgiou), conditionally accepted for publication in IEEE Transactions on Automatic Control.
• ENF extraction from digital recordings using adaptive techniques and frequency tracking (with O. Ojowu Jr., J. Li, and Y. Liu), IEEE Transactions on Information Forensics & Security, vol. 7, pp. 1330-1338, August 2012.
• The inverse problem of analytic interpolation with degree constraint and weight selection for control synthesis (with T. Georgiou, and A. Lindquist), IEEE Transactions on Automatic Control, vol. 55, pp. 405-418, February 2010.
• On complexity constrained interpolation with interpolation points close to the boundary (with A. Lindquist), IEEE Transactions on Automatic Control, vol. 54, pp. 1412-1418, June 2009.
• Metrics for power spectra: an axiomatic approach (with T. Georgiou and S. Takyar), IEEE Transactions on Signal Processing, vol. 57, pp. 859-867, March 2009.
• Stability-preserving rational approximation subject to interpolation constraints (with A. Lindquist), IEEE Transactions on Automatic Control, vol. 53, pp. 1724-1730, August 2008. Full length version.
• Passivity-preserving model reduction by analytic interpolation (with G. Fanizza, A. Lindquist, and R. Nagamune), Journal of linear algebra and its applications, vol. 425, pp. 608-633, September 2007.

Theses:

• Spectral estimation and distortion measures in speech processing, Master thesis, Royal Institute of Technology, 2003.
• Inverse problems in analytic interpolation for robust control and spectral estimation, Ph.D. thesis, Royal Institute of Technology, 2008.