[1] Vienna Univ Technol, Inst Telecommun, A-1040 Vienna, Austria
[2] Univ Pisa, Dept Ingn Informaz, Pisa, Italy
[3] Tech Univ Catalonia UPC, Dept Signal Theory & Commun, Barcelona, Spain
[4] Telecom ParisTech, Paris, France
[5] Univ Piraeus, Dept Informat, Piraeus, Greece
[6] Bogazici Univ, Istanbul, Turkey
[7] Liege Area, Liege, Belgium
[8] Tech Univ Darmstadt, Signal Proc Grp, Darmstadt, Germany