Modeling of Radio Channels With Leaky Coaxial Cable for LTE-M Based CBTC Systems

Due to some disadvantages of wireless local area networks (WLANs) in communication-based train control (CBTC) systems, long term evolution for metro (LTE-M) has been proposed to be the main communication method for future urban rail transit systems. In this letter, we model the channel of LTE-M with leaky coaxial cable for CBTC systems. Specifically, the proposed model is based on real field CBTC channel measurement results. Both path loss and small-scale fading are studied. The Akaike information criterion (AIC) is applied to determine the model of small-scale fading. We show that lognormal distribution is suitable for small-scale fading, and the corresponding parameters of lognormal distribution are also determined from the measurement results.