RIS-Aided Multi-Domain Index Modulation for Energy Harvesting Systems

Reconfigurable intelligent surface (RIS)-based index modulation is a promising technology for 6G and beyond networks. In this letter, a novel RIS-assisted reflecting, spatial, and media-based modulation system is proposed with both information decoding and energy harvesting at the receiver. To enhance spectral and energy efficiency, we design an integrated energy management framework which adopts muti-domain index modulation across reflecting, spatial, and media domains. A new energy harvesting-based RIS (EH-RIS) architecture is proposed on the foundation of the multi-domain index modulation, which improves both information transmission and energy harvesting. Compared with traditional RIS architectures, EH-RIS can utilize harvested energy to reinforce signal transmission so as to enhance the transmission reliability. The simulation results show that the proposed scheme can achieve better bit error rate performance than existing index modulation schemes.