[1] Manchester Metropolitan Univ, Dept Engn, Manchester M15 6BH, Lancs, England
[2] Alpen Adria Univ Klagenfurt, Inst Networked & Embedded Syst, A-9020 Klagenfurt, Austria
[3] Univ Texas Dallas, Dept Elect & Comp Engn, Richardson, TX 75083 USA
[4] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[5] Univ Pontificia Comillas, ETSI, ICAI, Madrid 28015, Spain