1. College of PhysicsJilin University2699 Qianjin AvenueChangchunPeople's Republic of China
2. Department of Automatic Test and ControlHarbin Institute of Technology92 Xidazhi StreetHarbinPeople's Republic of China
3. School of Electronic EngineeringChongqing University of Posts and Telecommunication2 Congwen roadPeople's Republic of China
4. Department of Electrical and Computer EngineeringDuke UniversityNC27708DurhamUSA