[1] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA
[2] Stevens Inst Technol, Dept Elect & Comp Engn, Hoboken, NJ 07030 USA
[3] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA
[4] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA
[5] Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 USA