Department of EECS, The University of Kansas, Lawrence, Kansas, USA. fli@ittc.ku.edu|Department of EECS, The University of Kansas, Lawrence, Kansas, USA. fli@ittc.ku.edu|Department of EECS, The University of Kansas, Lawrence, Kansas, USA. fli@ittc.ku.edu|Department of EECS, The University of Kansas, Lawrence, Kansas, USA. fli@ittc.ku.edu