Konstantinos Ntontin (kostantinos.ntontin@uni.lu) is currently a research scientist with the Signal Processing and Communications group, Interdisciplinary Center for Security, Reliability, and Trust, University of Luxembourg, 1855 Luxembourg City, Luxembourg. His research interests are related to the physical layer of wireless telecommunications, with a focus on performance analysis in fading channels; multiple-input, multiple-output systems; array beamforming; and transceiver design. He is a Member of IEEE.