Evaluation of Railway Communications System Based on 5G-RoF Technology and Millimeter Wave Band

In this paper, we present an evaluation of railway communications system based on 5G-RoF technology and millimeter wave band. Filter Bank MultiCarrier (FBMC) modulation is used in this work to generate the 5G waveform, and Radio over Fiber (RoF) technology is used to transport the Radio Frequency (RF) signal from Central Station (CS) to Base Stations (BSs). RoF system is based on Single Side Band (SSB) and Optical Carrier Suppression (OCS) modulations. For railway environment, we have considered the mobile radio channel taking into consideration a high velocity of receiver (train), which is characterized by Doppler effect. We have evaluated, by simulation, the performance of this system in terms of Bit Error Rate (BER) and Error Vector Magnitude (EVM). The simulations show that the length of optical link decreases by increasing the velocity of receiver, and the maximum length of railway track, that can be covered by each CS, is approximately 76 km for a velocity up to 300 km/h.