Published on in Vol 6, No 5 (2018): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/8866, first published
.
1 Department of Signal Theory and Communications, and Telematics Engineering, University of Valladolid, Valladolid, Spain
2 Faculty of Engineering, University of Deusto, Bilbao, Spain
3 Instituto de Telecomunicações, Portugal, Portugal
*all authors contributed equally