可重构智能表面的交替模式选择索引调制传输技术OA

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 re-main constrained by the inherent transmission modes of physical antennas or RIS elements,posing challenges to the seamless RIS-IM in-tegration.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 addi-tional 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 pro-posed 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.