Recent Work and Publications
New results on recursive identification of networked nonlinear state space systems, with significant delay, are described in
- T. Wigren, "Networked and delayed recursive identification of nonlinear systems", IEEE CDC 2017, Melbourne, Australia, pp.5851-5858, Dec. 12-15, 2017.
- T. Wigren, "MATLAB Software for Nonlinear and Delayed Recursive Identification - Revision 1", Technical Reports from the Department of Information Technology, 2017-007, Uppsala University, Uppsala, Sweden, April, 2017. Available: http://www.it.uu.se/research/publications/reports/2017-007/RecursiveNonlinearNetworkedIdentificationSW.zip
The following papers use the Popov criterion to derive new fundamental low frequency limitations for networked control systems, subject to a long delay and saturation.
- T. Wigren, "A disturbance rejection and data rate trade-off in networked data flow control", submitted to European J. Contr., September, 2017.
New methods for delay control in 5G wireless communication systems are described in
- R. A. Delgado, T. Wigren, K. Lau and R. H. Middleton, "Stability properties of a MIMO data flow controller", submitted to ACC 2018, Milwaukee, USA, June 27-29, 2017.
- K. Lau, T. Wigren, R. Delgado and R. H. Middleton, "Disturbance rejection properties for a 5G networked data flow delay controller", IEEE CDC 2017, Melbourne, Australia, pp. 1681-1687, Dec. 12-15, 2017.
- R. A. Delgado, K. Lau, R. H. Middleton and T. Wigren, "Networked delay control for 5G wireless machine type communications using multi-connectivity", submitted to IEEE Trans. Contr. Systems Tech., December, 2016.
- T. Wigren, K. Lau, R. Delgado and R. H. Middleton, "Delay skew packet flow control in 5G wireless systems with dual connectivity", submitted to IEEE Trans. Vehicular Tech., October, 2016.
- T. Wigren and R. Karaki, "Globally stable wireless data flow control", to appear in IEEE Trans. Contr. Network Systems, vol. 5, no. 1, 2018. DOI: 10.1109/TCNS.2016.2619906