Channel Aging Effects in SIM-Enhanced Cell-Free Massive MIMO System for HST Communications

IF 4.4 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-07-04 DOI:10.1109/LCOMM.2025.3585895

Qingfeng Ding;Huifan Peng;Xinquan Dai;Liqin Wan

引用次数: 0

Abstract

Stacked intelligent metasurface (SIM) technology, enabling dynamic wavefront manipulation of electromagnetic propagation environments, has been integrated into cell-free massive MIMO (mMIMO) systems to augment access point capabilities. In this letter, we investigate the impact of channel aging induced by the high-speed motion of trains on SIM-enhanced cell-free mMIMO systems. We derive closed-form expressions for achievable spectral efficiency (SE) in both uplink and downlink transmissions under imperfect channel state information with channel aging effects, and further optimizes uplink sum SE through a novel implementation of weighted minimum mean square error-based power allocation scheme along with a scalable group-based SIM beamforming algorithm. Simulation results demonstrate that SIM-enhanced cell-free mMIMO can reduce the degradation of system performance caused by channel aging compared to traditional cell-free mMIMO systems especially in strong line-of-sight environments.

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HST通信中sim增强无小区大规模MIMO系统的信道老化效应

堆叠智能超表面（SIM）技术能够对电磁传播环境进行动态波前操作，该技术已被集成到无蜂窝大规模MIMO （mMIMO）系统中，以增强接入点能力。在这封信中，我们研究了列车高速运动引起的通道老化对sim增强的无单元mMIMO系统的影响。在不完全信道状态信息和信道老化影响下，我们推导出上行和下行传输中可实现的频谱效率（SE）的封闭表达式，并通过一种新的基于加权最小均方误差的功率分配方案和基于可扩展组的SIM波束形成算法进一步优化上行和SE。仿真结果表明，与传统的无蜂窝mimo系统相比，sim增强的无蜂窝mimo系统可以减少信道老化引起的系统性能下降，特别是在强视距环境下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.