Receive generalized spatial modulation (RGSM), as an advanced type of receive spatial modulation (RSM), can be divided into diversity and multiplexing (MUX) schemes according to whether the symbols received by the selected antennas are the same. Recently, reconfigurable intelligent surface (RIS) assisted RSM has attracted much attention due to better reception performance and spectral efficiency. The RIS-aided RGSM (RIS-RGSM) with diversity scheme is realized in this paper via a simple improvement based on the state-of-the-art RIS-aided receive generalized space shift keying (RIS-RGSSK) scheme. To increase the transmission rate, the RIS-RGSM with MUX scheme is proposed in this paper, which adjusts the reflecting phase shifts and on/off states of RIS elements. Theoretical analysis and numerical simulations show that the proposed RIS-RGSM with MUX scheme has better bit error rate (BER) performance than the diversity scheme. Compared to the RIS-RGSSK scheme, the proposed RIS-RGSM scheme can significantly reduce the number of receive antennas while maintaining the transmission rate.

翻译：广义接收空间调制（RGSM）作为接收空间调制（RSM）的一种高级形式，可根据所选天线接收的符号是否相同分为分集方案和复用（MUX）方案。近年来，可重构智能表面（RIS）辅助的RSM因具有更优的接收性能和频谱效率而备受关注。本文基于现有最先进的RIS辅助广义接收空间移位键控（RIS-RGSSK）方案，通过简单改进实现了采用分集方案的RIS辅助RGSM（RIS-RGSM）。为提升传输速率，本文提出了采用MUX方案的RIS-RGSM，该方法通过调整RIS单元的反射相移和通断状态实现。理论分析和数值仿真表明，所提出的MUX方案相比分集方案具有更优的误码率（BER）性能。与RIS-RGSSK方案相比，所提出的RIS-RGSM方案能在保持传输速率的同时显著减少接收天线数量。