Eduard A. Jorswieck was born in 1975 in Berlin, Germany. He is managing director of the Institute of Communications Technology and the head of the Chair for Communications Systems and Full Professor at Technische Universitaet Braunschweig, Brunswick, Germany. From 2008 until 2019, he was the head of the Chair of Communications Theory and Full Professor at Dresden University of Technology (TUD), Germany. Eduard’s main research interests are in the broad area of communications. He has published more than 130 journal papers, 15 book chapters, 3 monographs, and some 275 conference papers on these topics. Dr. Jorswieck is IEEE Fellow. He is member of the IEEE SAM Technical Committee since 2015. Since 2017, he serves as Editor-in-Chief of the EURASIP Journal on Wireless Communications and Networking. He serves currently on the editorial board for IEEE Transactions on Information Forensics and Security. In 2006, he received the IEEE Signal Processing Society Best Paper Award.
Tutorial: “Copula-based multiuser communications for 5G reliability”
Abstract: Reliability in wireless communications can be improved by diversity in space, frequency, and time. Use cases in beyond 5G networks require high reliability and will apply massive number of antennas, huge spectrum resources, and multi-connectivity. It is well known that correlation can reduce the outage performance of diversity schemes. However, the impact of general dependency structures – so called copula – on the performance of diversity schemes is less studied. In the talk, we provide an approach to model and analyze dependent fading multi-user systems. On the bright side, there is a optimistic results that negative dependent – counter-monotonic – fading channels lead to positive zero-outage capacities. On the down side, the framework provides worst-case bounds on the joint distributions of fading channels for various multi-user settings. First, the scenario with two fading channels is studied, and then it is generalized to the case with arbitrary number. The focus is on the outage performance for slowly fading channels. In an outlook, we provide also insights for average performance for fast fading multiuser channels. All results are illustrated with numerical examples, comparisons to the standard correlation models, and with applications in beyond 5G networks.
Keynote: “Efficient global optimization in 5G and beyond”
Abstract: Global optimization is concerned with obtaining the globally optimal solution of nonconvex optimization problems. Algorithms for such problems can mostly be categorized into outer approximation algorithms and branch and bound (BB) methods. This keynote will focus on BB methods for continuous optimization and demonstrate that they are one of the most versatile tools in global optimization theory. The focus for the bounding part is on exploiting partial monotonicity in the problem, which leads to the novel mixed monotonic programming (MMP) framework, a generalization of classical monotonic optimization (MO). The theory developed is successfully applied in several case studies from the area of resource allocation for wireless interference networks in 5G and beyond. In particular, we will cover energy-efficient resource allocation and show how to approach such problems without Dinkelbach’s algorithm. Further applications are hierarchical resource allocation, beamforming, and resource allocation over rate regions. Although all of these problems are NP-hard we will demonstrate that they can be solved efficiently for small to medium scale problems.