High-speed train (HST) communications are challenging due to fast time-varying channels and Doppler effects. Recently, reconfigurable intelligent surface (RIS) has been envisioned to be one of the most promising technologies for tackling the difficult problems of HST communications. In this paper, we first propose a transmission model of the HST communication system using RIS on the train side. Then, different strategies for mitigating delay spread (DS) are compared from the perspectives of the phase shift set design and deployment of the RIS. In addition, we derive the spectral efficiency (SE) expression of the proposed system. Numerical evaluations validate the analytical results and reveal that the RIS on the train side not only increases SE but also reduces DS.
|Title of host publication
|2022 IEEE 22nd International Conference on Communication Technology, ICCT 2022
|Institute of Electrical and Electronics Engineers Inc.
|Number of pages
|Published - 2022
|22nd IEEE International Conference on Communication Technology, ICCT 2022 - Virtual, Online, China
Duration: 11 Nov 2022 → 14 Nov 2022
|International Conference on Communication Technology Proceedings, ICCT
|22nd IEEE International Conference on Communication Technology, ICCT 2022
|11/11/22 → 14/11/22
- Doppler effect
- Reconfigurable intelligent surface
- delay spread
- high-speed train communications
- spectral efficiency