[1] Politecn Milan, Dept Elect Informat & Bioengn, I-20133 Milan, Italy
[2] Univ Coimbra, Dept Elect & Comp Engn, P-3030290 Coimbra, Portugal
[3] INESC Coimbra, DEEC, P-3030290 Coimbra, Portugal
[4] Tech Univ Munich, Dept Elect & Comp Engn, D-80333 Munich, Germany
[5] Nokia Bell Labs, Algorithms Analyt Augmented Intelligence & Device, F-91620 Nozay, France
[6] Kyoto Univ, Grad Sch Informat, Kyoto 6068501, Japan
[7] Concordia Univ, Montreal, PQ H3G 1M8, Canada