Localization-based OFDM framework for RIS-aided systems

TL;DR

This paper introduces a localization-based OFDM framework for RIS-aided systems that reduces overhead by leveraging localization information instead of traditional channel estimation, improving user multiplexing efficiency.

Contribution

The paper proposes a novel RIS-OFDM framework that uses localization data for resource allocation, avoiding extensive channel estimation overhead.

Findings

Effective user multiplexing without channel estimation

Improved robustness over traditional CE-based methods

Demonstrated performance gains in RIS-aided systems

Abstract

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.