RIS-assisted Tag-side Pre-processed Spatial Modulation in Backscatter Communication

This paper addresses the need for enhanced control over signal propagation in wireless communication using reconfigurable intelligent surfaces (RIS). We propose RIS-assisted backscatter communication (BC) systems, introducing a linear pre-processing-based spatial modulation (SM) technique for data transmission. Our work focuses on signaling design, phase shift optimization, and bit error rate (BER) evaluation through Monte-Carlo simulations. Results demonstrate that RIS-assisted pre-processing in BC enhances transmission reliability and energy efficiency, offering a promising solution for next-generation low-power communication systems.