Prof. Rafael P. Torres is a Full Professor in Signal Processing and Communications Engineering at the Department of Communications Engineering, University of Cantabria, Spain. He completed his BSc studies in Physical Sciences at the University of Granada in 1985, MSc studies in Applied Physics at the University of Granada in 1986, and PhD studies in Signals, Systems, and Radio Communications at the Polytechnic University of Madrid (UPM) in 1990.  Since the mid-90s, his research has focused on the modelling (experimental and by ray-tracing techniques) of the radio channel and the analysis of its impact on mobile and wireless communication systems. In this area, his main achievements are focused on the development of ray-tracing methods to simulate the radio channel in complex propagation environments ( CINDOOR© ), on the experimental characterization of the channel, on the development of space-time coding techniques, and more recently, on the characterization of massive MIMO channels.  Other topics of interest in the scientific career have been those that involve the application of channel knowledge for the design of radio communication subsystems, such as selection techniques in transmission diversity systems with space-time codes; and the spectral efficiency, fairness, and hardening in massive MIMO systems.