1. Department of Electronics and Informatics (ETRO), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
2. Imec, Kapeldreef 75, 3001 Leuven, Belgium
3. Department of Telecommunications and Information Processing (TELIN-GAIM), Ghent University, 9000 Ghent, Belgium
4. Department of Electronics and Information Systems, Clifford Research Group, Ghent University, 9000 Ghent, Belgium