1. Division of Computer, Electrical, and Mathematical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
2. Department of Electronic Engineering, Jiangsu University of Technology, Changzhou, Jiangsu 213001, China
3. Halliburton Far East Pointe Ltd., 639940, Singapore
4. Department of Electrical and Computer Engineering, West Virginia University Institute of Technology, Beckley, West Virginia, 25801, USA