Séminaire ICI : Roope Vehkalahti

Titre du séminaire et orateur

Code Design Principles for Ultra-Reliable Random Access with Preassigned Patterns.

Roope Vehkalahti (Aalto University, Finland)

Date et lieu

Jeudi 12 juillet 2018, 14h

ENSEA, salle 384


In this talk I will discuss medium access control layer random access under the assumption that the receiver can perform successive interference cancellation, without feedback. During recent years, a number of protocols with impressive error performance have been suggested for this channel model. However, the random nature of these protocols causes an error floor which limits their usability when targeting ultra-reliable communications. In very recent works by Paolini et al. and Boyd et. al., it was shown that if each user employs predetermined combinatorial access patterns, this error floor disappears. In this talk I will describe the basic problem setting and discuss code design criteria for deterministic random access protocols. Finally I will describe some combinatorial structures that can be used as random-access codes.


Roope Vehkalahti received the M.Sc. and Ph.D. degrees from the University of Turku, Finland, in 2003 and 2008, respectively, both in pure mathematics. He was with the Department of Mathematics, University of Turku, Finland 2003-2016. In 2011-2012 he was visiting Swiss Federal Institute of Technology, Lausanne (EPFL). He is currently with the Department of Communications and Networking, Aalto University, Espoo, Finland. His research interests include applications of algebra and number theory to information theory.