Department of Electric Engineering and Computer Science, University of Central Florida, Orlando, FL, 32816, USA. ying2010@knights.ucf.edu.|Department of Electric Engineering and Computer Science, University of Central Florida, Orlando, FL, 32816, USA. haihu@cs.ucf.edu.|Department of Electric Engineering and Computer Science, University of Central Florida, Orlando, FL, 32816, USA. xiaoman@mail.ucf.edu.