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可重构智能表面(Reconfigurable Intelligent Surface, RIS)在物理空间中智能操控电磁波传播路径，显著提升信号覆盖能力与通信效率，适用于复杂通信场景中障碍物遮挡区域的信号补盲。目前大多RIS融合索引调制(Index Modulation, IM)方案仍然受限于物理天线或RIS反射单元传输模式，如何有效结合RIS与IM技术成为无线通信领域的研究重点。为此，提出一种基于RIS的交替模式选择索引(RIS Alternate Mode Selection Index, RIS-AMSI)方案，通过动态切换RIS单元在2个时隙的激活模式，将模式交替顺序作为额外索引信息嵌入传输过程。同时，该方案设计了新型调制机制，利用RIS的信道增益特性，构建低复杂度的贪婪检测器实现高效的信息解调。通过理论推导和仿真实验，验证了方案理论误码率(Bit Error Rate, BER)分析的准确性。结果表明，与基准方案相比，所提方案在保持相近频谱效率的同时显著降低BER,为RIS与IM技术的融合提供了切实可行的新思路。
Abstract：Reconfigurable Intelligent Surfaces(RIS) intelligently manipulate electromagnetic wave propagation paths in physical space, significantly enhancing signal coverage capability and communication efficiency. This approach is particularly effective in complex communications with obstacle-blocked areas for signal blind spot mitigation. Existing RIS-integrated Index Modulation(IM) schemes remain constrained by the inherent transmission modes of physical antennas or RIS elements, posing challenges to the seamless RIS-IM integration. To address this issue, this paper proposes an RIS Alternate Mode Selection Index(RIS-AMSI)scheme. By dynamically switching the activation modes of RIS elements across two consecutive time slots and embedding the mode alternation sequence as additional index information in the transmission process, the scheme leverages RIS's channel gain characteristics to design a low-complexity greedy detector for efficient information demodulation. Theoretical analysis and simulation experiments validate the accuracy of the proposed Bit Error Rate(BER) performance characterization. Results demonstrate that RIS-AMSI achieves comparable spectral efficiency to benchmark schemes while substantially reducing the BER, offering a practical and feasible solution for RIS-IM convergence.
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基本信息:
中图分类号:TN929.5
引用信息:
[1]杨攀,曾灿良,曹文涛,等.可重构智能表面的交替模式选择索引调制传输技术[J].无线电通信技术,2026,52(01):30-35.
基金信息:
国家自然科学基金面上项目(61871132)~~
2025-12-18
2025-12-18
2025-12-18