**Author details**

M. T. de Melo1\*, B. G. M. de Oliveira1 , Ignacio Llamas-Garro2 and Moises Espinosa-Espinosa2

\*Address all correspondence to: marcostdemelo@gmail.com

1 Federal University of Pernambuco, PE, Recife, Brazil

2 Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Communications Subsys‐ tems, Castelldefels, Spain
