Reconfigurable Refractive Surfaces: An Energy-Efficient Way to Holographic MIMO

TL;DR

This paper proposes reconfigurable refractive surfaces as an energy-efficient alternative to phased arrays for holographic MIMO, enabling high data rates with lower power consumption in future wireless networks.

Contribution

It introduces a new performance analysis framework for RRS-based HMIMO systems and compares their power efficiency with traditional phased arrays.

Findings

RRS achieves comparable data rates to phased arrays.

RRS significantly reduces power consumption.

Simulation confirms RRS's energy efficiency.

Abstract

Holographic Multiple Input Multiple Output (HMIMO), which integrates massive antenna elements into a compact space to achieve a spatially continuous aperture, plays an important role in future wireless networks. With numerous antenna elements, it is hard to implement the HMIMO via phased arrays due to unacceptable power consumption. To address this issue, reconfigurable refractive surface (RRS) is an energy efficient enabler of HMIMO since the surface is free of expensive phase shifters. Unlike traditional metasurfaces working as passive relays, the RRS is used as transmit antennas, where the far-field approximation does not hold anymore, urging a new performance analysis framework. In this letter, we first derive the data rate of an RRS-based single-user downlink system, and then compare its power consumption with the phased array. Simulation results verify our analysis and show that the RRS is an energy-efficient way to HMIMO.