1. University of Piraeus; Piraeus Greece
2. Thales Communications SA; 92704 Colombes France
3. Orange Labs CORE/M2V/IODA; 92794 Issy Moulineaux France
4. Centre for Communication Systems Research; University of Surrey; Guildford GU2 7XH UK
5. National and Kapodistrian University of Athens, Panepistimiopolis; Ilisia Athens 15784 Greece
6. Alcatel-Lucent Bell Labs; 70435 Stuttgart Germany