[1] Politecn Torino, Dept Elect & Telecommun, Turin, Italy
[2] Hiroshima Univ, Res Inst Nanodevice & Bio Syst, Hiroshima, Japan
[3] Politecn Torino, Turin, Italy
[4] Macquarie Univ, Engn, Sydney, NSW 2109, Australia
[5] Macquarie Univ, IEEE Student Branch, Sydney, NSW 2109, Australia