1. Center for Advanced Computer Studies, University of Louisiana in Lafayette, Lafayette, LA 70504-4330, USA. E-mail: axr8951@cacs.louisiana.edu
2. Department of Electrical and Computer Egineering, University of Miami, 1251 Memorial Drive, Coral Gables, FL 33124-0640, USA. E-mail: mkubat@chronos.ece.miami.edu