Demodulation Reference Signal (DM-RS) based channel estimation for non-terrestrial networks to support high mobility

초록

This paper provides an adaptive 5G -NR based solution for non -terrestrial networks (NTN) to support the high mobility of the user equipment (UE). A front -loaded demodulation reference signal (DM -RS) symbol pattern with additional orthogonal symbols is proposed to support UE mobility 500 km/h. We develop a 5G -NR link -level simulator (LLS) to analyze the performance of physical downlink shared channel (PDSCH) under the proposed front -loaded DM -RS symbol pattern, tapped delay line (TDL) channel model, and precoding-based beamforming/MIMO schemes. The simulation results show that the proposed channel estimation method based on front -loaded DM -RS helps to improve the link reliability and achieves the maximum spectral efficiency up to 5.05 bps/Hz under 64-QAM, which can also contribute to the evolution of NTN in 6G networks to support the transonic speed mobility of UE. (c) 2023 The Authors. Published by Elsevier B.V. on behalf of The Korean Institute of Communications and Information Sciences. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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