1. Department of Electrical and Electronics Engineering, Coimbatore Inst. of Engineering and Technology, Narasipuram, Coimbatore 641109, Tamilnadu, IN (Corresponding author), e-mail: gunapriya78@yahoo.in
2. Department of Electronics and Communication Engineering SVS College of Engineering, Arasampalayam, Coimbatore 642109, Tamilnadu, IN, e-mail: sabari_giriraj@yahoo.com