1. Department of Mathematics and Theory, Peng Cheng Laboratory, Shenzhen, China
2. Department of Research and Department, General Test Systems Inc., Shenzhen, China
3. Department of Electrical and Information Engineering, Hunan University, Changsha, China
4. Department of Electrical and Computer Engineering, Western University, London, ON, Canada
5. Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada