Dr. Shuangfeng Han is currently a senior project manager in green communication research center of china mobile research institute. His research interests are mainly focused on green technologies R&D in 5G wireless communication systems, including large scale antenna system (LSAS), active antenna system (AAS), co-frequency co-time full duplex, non-orthogonal multiple access scheme, energy efficiency and spectrum efficiency co-design, and beyond cellular green generation solutions. Prior to joining CMRI, Dr. Han was a senior engineer in Samsung Electronics research center from 2006 to 2012. His research interests included MultiBS MIMO, MIMO codebook design, small cell/HetNet, Millimeter wave communication, D2D and distributed radio over fiber. Dr. Shuangfeng Han graduated from Tsinghua University in Beijing in 2006, and majored in information and communication systems. He is an inventor on 37 patent applications, and author on over 10 peer-reviewed conference and journal publications.  He has been reviewer for various IEEE journals and conferences.