RIS-Based Reflection Pattern Modulation And Power Distribution Index Modulation

In this letter, a new reconfigurable intelligent surface (RIS)-based reflection pattern modulation (RPM) and power distribution index modulation (PIM) scheme named RIS-RPM-PIM is proposed. In the proposed scheme, on one hand, reflection pattern modulation and power distribution IM on RIS are used to improve the spectral efficiency, on the other hand, signature constellations are designed to maximize the Euclidean distance of the symbol constellation. Simulations and theoretical analysis show that the RIS-RPM-PIM scheme achieves superior bit error rate (BER) performance than the reference HRM scheme.