Index-Modulated Metasurface Transceiver Design using Reconfigurable Intelligent Surfaces for 6G Wireless Networks

TL;DR

This paper introduces electromagnetics-compliant RIS designs for 6G transceivers that enable index modulation, improving spectral efficiency and bit error rates through programmable metasurfaces and electromagnetic analysis.

Contribution

It presents novel RIS-based transceiver designs for index modulation in 6G, combining electromagnetic modeling with programmable metasurfaces for enhanced communication performance.

Findings

RIS-aided IM outperforms traditional methods in bit error rates

Programmable RIS can vary reflection phase and generate frequency harmonics

Numerical experiments validate the proposed electromagnetic RIS implementations

Abstract

Higher spectral and energy efficiencies are the envisioned defining characteristics of high data-rate sixth-generation (6G) wireless networks. One of the enabling technologies to meet these requirements is index modulation (IM), which transmits information through permutations of indices of spatial, frequency, or temporal media. In this paper, we propose novel electromagnetics-compliant designs of reconfigurable intelligent surface (RIS) apertures for realizing IM in 6G transceivers. We consider RIS modeling and implementation of spatial and subcarrier IMs, including beam steering, spatial multiplexing, and phase modulation capabilities. Numerical experiments for our proposed implementations show that the bit error rates obtained via RIS-aided IM outperform traditional implementations. We further establish the programmability of these transceivers to vary the reflection phase and generate frequency harmonics for IM through full-wave electromagnetic analyses of a specific reflect-array metasurface implementation.