Institutionen för informationsteknologi

Recent Work and Publications

The following paper presents new techniques for low complexity beam direction scanning when performing OTDOA positioning using narrow beam forming, in particular in mmW systems

  • R. Delgado, T. Wigren, K. Lau, R. Middleton and I. Siomina, "Statistical beam information for mmW positioning", to appear in Proc. VTC2020-Spring, Antwerp, Belgium, May 25-28, 2020.

New methods for delay control in 5G wireless communication systems are described in

  • T. Wigren, Y. Sung, R. A. Delgado, K. Lau and R. H. Middleton, "Jitter suppression for very low latency feedback control over NR", to appear in VTC2020-Spring, Antwerp, Belgium, May 25-28, 2020.
  • R. H. Middleton, T. Wigren, L. Boström, R. A. Delgado, K. Lau, R. Karlsson, L. Brus and E. Corbett, "Feedback control applications in new radio - exploring delay control and alignment", IEEE Vehicular Technology Magazine, vol. 14, no. 2, pp. 70-77, June, 2019. DOI: 10.1109/MVT.2019.2892495. Available: .

The following paper uses 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", European J. Contr., vol. 47, pp. 1-10, May, 2019.

New results on nonlinear stability based ammonium feedback and feed-forward control in wastewater treatment plants exploiting a modified PI controller are described in

  • T. Chistiakova, T. Wigren and B. Carlsson, "Combined L_2-stable feedback and feedforward aeration control in a wastewater treatment plant", to appear in IEEE Trans. Contr. Sys. Tech., 2019. DOI: 10.1109/TCST.2019.2891410. Available:
Uppdaterad  2020-01-11 17:44:00 av Torbjörn Wigren.