1. School of Electrical Engineering, Beijing Jiaotong University,Beijing,China
2. University of Strathclyde,Dept. of Electronic and Electrical Engineering,Glasgow,United Kingdom
3. Universiti Teknologi Malaysia (UTM),Faculty of Electrical Engineering,Johor,Malaysia
4. School of Electrical, Comp., and Teleco. Engineering, University of Wollongong,Wollongong,Australia