Ekram Hossain is a Professor in the Department of Electrical and Computer Engineering at the University of Manitoba, Canada, where his current research interests lie in the design, analysis and optimization of wireless/mobile communications networks, smart grid communications, cognitive and green radio systems. He has received several awards including the University of Manitoba Merit Award in 2010 (for Research and Scholarly Activities) and the 2011 IEEE Communications Society Fred Ellersick Prize Paper Award. Zhu Han is an Assistant Professor in the Electrical and Computer Engineering Department at the University of Houston, Texas. He received his Ph.D. in electrical engineering for the University of Maryland, College Park, in 2003 and worked for two years in industry as an R&D Engineer for JDSD. He is a recipient of the NSF CAREER award (2010) and the IEEE Communications Society Fred W. Ellersick Prize Paper Award. H. Vincent Poor is the Michael Henry Strater University Professor at Princeton University, where he is also the Dean of the School of Engineering and Applied Science. He is a Fellow of the IEEE and is a member of the US National Academy of Engineering and of the US National Academy of Sciences. He is also a Fellow of the American Academy of Arts and Sciences, an International Fellow of the Royal Academy of Engineering of the UK, and a former Guggenheim Fellow. Recent recognition of his work includes the 2009 Edwin Howard Armstrong Award of the IEEE Communications Society, the 2010 IET Ambrose Fleming Medal, the 2011 IEEE Eric E. Sumner Award and an honorary doctorate from the University of Edinburgh.