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Talk Announcement: Prof. Dr. Erik Ström

Telecommunications / News / Talk Announcement: Prof. Dr. Erik Ström
03. March 2026
Total and Undetected Error Probability: Approaching Finite-Blocklength Bounds With Polar Codes

Speaker: Prof. Dr. Erik Ström, Chalmers University of Technology, Göteborg, Sweden

Date and Time: Tuesday, March 3, 2026 at 14:30-15:30.

Place: Seminar Room SEM389 (Room No. CG 04 02)

Abstract

Short-packet communication is central to machine-type communication, including ultra-reliable low-latency communication (URLLC) and mission-critical control traffic. In this regime, conventional layered architectures, where error detection and error correction are performed separately, can incur substantial overhead and suboptimal trade-offs between total error probability and undetected error probability. This talk revisits joint error-control and error-detection from a finite-blocklength perspective. Building on Forney’s optimal decision rule, we study the achievable trade-off between total and undetected error probabilities and derive new achievability bounds tailored to short blocklengths. The bounds are based on both layered schemes and joint threshold-based decoding using generalized information density, and they provide computable SNR thresholds for given reliability targets. We benchmark practical CRC-aided polar coding schemes against these bounds and demonstrate that joint decoding approaches can strictly outperform conventional layered designs in the short-blocklength regime. We also analyze robustness under imperfect channel state information, highlighting when layered or joint approaches are preferable.

 

Bio:

Erik G. Ström received the M.Sc. degree from the Royal Institute of Technology (KTH), Stockholm, Sweden, in 1990, and the Ph.D. degree in electrical engineering from the University of Florida, Gainesville, in 1994. In 1995, he held a postdoctoral position at the Department of Signals, Sensors, and Systems at KTH. He was appointed Assistant Professor at KTH in February 1996 and joined Chalmers University of Technology, Gothenburg, Sweden, in June 1996. He has been a Professor of Communication Systems at Chalmers since 2003. He currently heads the Division of Communications, Antennas, and Optical Networks and serves as Director of Chalmers’ Area of Advance Information and Communication Technology. His research interests include signal processing and communication theory, with emphasis on constellation labeling, channel estimation, synchronization, multiple access and multiuser detection, wireless positioning, and vehicular communications. Dr. Ström has served as Senior Editor of the IEEE Transactions on Intelligent Transportation Systems and as Guest Editor for special issues of the Proceedings of the IEEE (Vehicular Communications, 2011) and the IEEE Journal on Selected Areas in Communications (Signal Synchronization, 2001; Multiuser Detection, 2008). He was a member of the board of the IEEE VT/COM Swedish Chapter (2000–2006). He received the Chalmers Pedagogical Prize (1998), the Chalmers Ph.D. Supervisor of the Year Award (2009), and the Chalmers Area of Advance Award (2020). Dr. Ström is a Fellow of the IEEE.

 

Post created on: 13. February 2026

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