1. School of Electronic EngineeringUniversity of Electronic Science and Technology of ChinaChengdu611731People's Republic of China
2. CNITViale G.P. Usberti, n. 181/A – 43124 Parma, c/o udr Università ‘Federico II’, via Claudio 21I‐80125NapoliItaly
3. Elettronica S.p.A.Via Tiburtina km 13.7I‐00131RomaItaly