Localization-based OFDM framework for RIS-aided systems
This addresses efficiency issues for wireless network operators, but appears incremental as it builds on existing RIS and OFDM technologies.
The paper tackles the overhead problem of channel estimation and phase-shift optimization in integrating reconfigurable intelligent surfaces (RISs) with OFDM wireless networks by proposing a framework that uses localization information for user multiplexing, showing effectiveness compared to CE-based methods.
Efficient integration of reconfigurable intelligent surfaces (RISs) into the current wireless network standard is not a trivial task due to the overhead generated by performing channel estimation (CE) and phase-shift optimization. In this paper, we propose a framework enabling the coexistence between orthogonal-frequency division multiplexing (OFDM) and RIS technologies. Instead of wasting communication symbols for the CE and optimization, the proposed framework exploits the localization information obtainable by RIS-aided communications to provide a robust allocation strategy for user multiplexing. The results demonstrate the effectiveness of the proposed approach with respect to CE-based transmission methods.