[1] Fractus, Technol & Intellectual Property Rights Dept, Barcelona, Spain
[2] Ramon Llull Univ, Elect & Commun Dept, Barcelona, Spain
[3] Sony Mobile, Syst & Concept, Redwood City, CA USA
[4] LitePoint Corp, Commun Syst Grp, Sunnyvale, CA USA
[5] Bluetest AB, Gothenburg, Sweden