[1] Nanyang Technol Univ, Energy Res Inst NTU, Sch Comp Sci & Engn, Interdisciplinary Grad Program, Singapore 639798, Singapore
[2] Beijing Jiaotong Univ, Sch Comp & Informat Technol, Beijing 100044, Peoples R China
[3] Guangdong Univ Technol, Sch Automat, Guangzhou 510006, Peoples R China
[4] Singapore Univ Technol & Design, Pillar Informat Syst Technol & Design, Singapore 487372, Singapore
[5] Sungkyunkwan Univ, Dept Elect & Comp Engn, Suwon 16419, South Korea
[6] Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada
[7] Princeton Univ, Dept Elect & Comp Engn, Princeton, NJ 08544 USA