1. National Technical University of Athens,School of Electrical and Computer Engineering,Athens,Greece
2. HES-SO Valais,Switzerland
3. CNR-IEIIT and Wilab, CNIT,Bologna,Italy
4. DEI, Università di Bologna, and WiLab, CNIT,Bologna,Italy
5. University of Oulu,Centre for Wireless Communications,Oulu,Finland
6. Politecnico di Milano,Dept. Electronics, Information and Bioengineering,Milano,Italy
7. AIT AIT Austrian Institute of Technology,Vienna,Austria
8. Poznan University of Technology,Institute of Radiocommunications,Poznan,Poland