Two-Stage Refinement Sparse Channel Estimation for Reconfigurable Intelligent Metasurface Antenna (RIMSA) Massive MIMO

2026-09-19

AI Summary

本文针对RIMSA大规模MIMO系统中的信道估计问题，提出了一种基于压缩感知原理的两阶段精细化方法，通过优化超材料元件相位响应来提高估计精度。

Abstract

To meet the increasing demands for high data rates and large capacity, next generation wireless communication systems require transceivers equipped with a large number of antennas. Massive multiple-input multiple-output (MIMO) with metasurface antennas has emerged as a promising solution. In this paper, we investigate the channel estimation problem for the emerging reconfigurable intelligent metasurface antenna (RIMSA) array systems. Specifically, we develop a two-stage refinement (TSR) channel estimation method based on the compressed sensing (CS) principle. In the first stage, we exploit the antenna structure of RIMSA to receive pilots by setting identical phase response vectors across all RIMSAs. In this manner, the coherence of the measurement matrix under the CS framework is reduced and the channel estimation performance is improved. However, this special design introduces channel direction-of-arrival (DoA) estimation ambiguity and yields an ambiguous candidate DoA set. In the second stage, we optimize the phase responses of the metamaterial elements to resolve the ambiguity and accurately estimate the DoAs and channel coefficients. Overall, the estimation accuracy is improved in the first stage at the cost of ambiguity, and this ambiguity is eliminated in the second stage. We illustrate the performance advantages of the TSR method by presenting the numerical results and comparing it with the existing methods.

Problem

• Channel Estimation
• Reconfigurable Intelligent Metasurface Antenna (RIMSA)
• Massive MIMO
• Compressed Sensing (CS)

Innovation

• Two-Stage Refinement (TSR)
• Compressed Sensing (CS)
• Reconfigurable Intelligent Metasurface Antenna (RIMSA)
• Direction-of-Arrival (DoA)