Rubio Arjona, LorenzoRodrigo Peñarrocha, Vicent MiquelMolina-García-Pardo, José MaríaJUAN LLACER, LEANDROPASCUAL GARCIA, JUANReig, JuanSanchis Borrás, Concepción2020-11-142020-11-142019-120018-9545https://riunet.upv.es/handle/10251/155062© 2019 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works."[EN] In this correspondence, useful measurement results of the propagation channel characteristics in an intra-wagon environment at millimeter wave (mmWave) frequencies are presented. The measurements were collected inside an underground convoy from 25 to 40 GHz in the frequency domain. A broadband radio over fiber (RoF) link was used in order to avoid the high losses introduced by cables at these frequencies, thus allowing long distances between the transmitter and receiver antennas. Values of the path loss exponent and delay spread are reported at the potential 26, 28 and 38 GHz bands to deploy the future fifth-generation (5G) systems. These results allow us to have a better knowledge of the path loss and time dispersion characteristics of the propagation channel in this particular environment, characterized by rich-scattering with long delays.Reserva de todos los derechosMm WaveIntra-wagon5GChannel measurementsPath lossTime dispersionTEORIA DE LA SEÑAL Y COMUNICACIONESArtículo10.1109/TVT.2019.2947205Abierto