Juan Carlos Merlano-Duncan, Jorge Querol, Liz Martinez-Marrero, Jevgenij Krivochiza, SNT University of Luxembourg, Luxembourg; Adriano Camps, Universitat Politècnica de Catalunya-BarcelonaTech and IEEC/CTE-UPC, Spain; Symeon Chatzinotas, Bjorn Ottersten, SNT University of Luxembourg, Luxembourg