Study on Channel Coding for Future Railway Mobile Communication Systems

This paper studies 5G channel coding, Quasi-Cyclic Low Density Parity Check (QC-LDPC) codes, which are expected to be used in future railway mobile communication systems (FRMCS), of which the standard is being specified by Union Internationale des Chemins de fer (UIC) in Europe. The QC-LDPC codes, used by the 5G New Radio (NR), has an ability to adapt to the channel dynamics due to the rateless capability of the codes. Evaluation is performed using Extrinsic Information Transfer (EXIT) chart based on an equivalent erasure probability derived from the simulated FRMCS under Indonesia FRMCS channel model at speed up to 500 km/h. We found that the rateless characteristic of QC-LDPC codes is useful for FRMCS to reduce the error, especially at low signal-to-noise power ratio (SNR) below 15 dB. Results of this paper are expected to provide contributions either on software or hardware for the development of FRMCS high speed train.