Path Loss Characterization in an Indoor Laboratory Environment at 3.7 GHz in Line-Of-Sight Condition Autor Avella-Cely, Sandy Enrique, Muñoz-Pérez, Juan Carlos, Fernández-González, Herman Antonio, Rubio-Arjona, Lorenzo, Reig-Pascual, Juan Ribera, Rodrigo-Peñarrocha, Vicent Miguel