[1] Inproc Technol & Consulting Grp, Gran Via Carles III 86, Barcelona 08028, Spain
[2] Univ Politecn Cataluna, Dept Phys, BarcelonaTech UPC, ETSEIB, Diagonal 647, Barcelona 08028, Spain
[3] FUS ALIANZ Sci Engn & Consulting, C Nord 19, Tarragona 43700, Spain