Foteini Savvidou, Stavros Tsimpoukis, Stavros Filosidis, Chrysoula Psyrouki, Konstantinos Barmpounakis
The authors are with the Signal Processing and Biomedical Technology Unit, Telecommunications Laboratory, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece (e-mail: sfoteini@ece.auth.gr; tsimpous@ece.auth.gr; stavrosf@ece.auth.gr; chrypsyr@ece.auth.gr; kmparmpou@ece.auth.gr)