一种基于稀疏性的RIS辅助信道估计方法

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关键词：可重构智能反射面；信道估计；级联信道；双稀疏性；正交匹配追踪 中图分类号：TN929.5 文献标志码：A 文章编号：1001-3695（2026）01-028-0234-06 doi：10.19734/j.issn.1001-3695.2025.06.0197

Sparse-based RIS assisted channel estimation method

Liu Jiaxuan，ZhangXiaojian，WangDan（ScholofComictidtiogeigoingUesitftsdeleocas，ogingi）

Abstract：This paper developed an improved OMP-based dual-sparsitychannel estimation method （D-OMP）to address two critical chalengesinRIS-asistedcommunicationsystems：excessivepilotresourceconsumptionandchannel interferencefrom abnormalusers（userswithweight≤O.1）.Theproposedalgorithmfullyutilizedthedual-sparsitycharacteristicsof thecascadedchannel intheangular domainandrefined the thre-stageD-OMPframework：a）jointlyestimating the multi-usercommon rowsupport byreplacing man with median energydetection toefectivelysuppressabnormal-user interference;b）introducing multi-user weighting tooptimize thepartiallycommon columnsupport;c）adaptivelypruningabnormal users via multi-user weightingcoeficients tooptimizeuser-specificcolumnsupport.Simulationresultsindicatethatthealgorithmreducespilot overheadwhileachieving morethan3dBNMSEimprovementoverconventional OMP，andthemethodmaintainsstableperformance underboth low-SNRconditionsandabnormal-user interference，significantlyenhancing systemrobustness.Bycombiningdual-sparsityjointestimationwithanabnomal-usersuppesionmechanism，thisworkenablescomputationallyefient channel estimation for dense RIS deployments.

Key words：RIS；channel estimation；cascade channel；dual sparsity；OMP

0引言

随着第六代移动通信系统（6G）研究的持续推进，可重构智能反射面（reconfigurableintelligentsurface，RIS）作为一种具有调控特性的新型无线通信使能技术，凭借其经济高效、节能环保和灵活可控等显著特点，正逐渐成为学术界与产业界共同关注的研究方向[1。（剩余15409字）