1. School of Engineering & Physics, The University of the South Pacific, Suva, FIJI ISLANDS
2. Department of Computer Science, College of Arts and Sciences, Troy University, Montgomery, AL 36103 USA, also with School of Information Technology and Engineering, Faculty of Engineering, University of Ottawa, Ottawa, ON K1N 6N5, CANADA
3. Department of Electrical and Electronic Engineering Ahsanullah University of Science and Technology, Dhaka 1208, BANGLADESH