1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesSchool of Electrical and Electronic EngineeringNorth China Electric Power UniversityBeijing102206People's Republic of China
2. National Institute of Information and Communications TechnologyKyotoJapan
3. Department of Information and Electric EngineeringMuroran Institute of TechnologyMuroranHokkaidoJapan
4. Department of Network TechnologyChina Mobile Communication Corporation Research InstituteBeijingPeople's Republic of China
5. Graduate School of Global Information and Telecommunication StudiesWaseda UniversityTokyoJapan