Optimal One- and Two-Sided Multi-level Amplitude Shift Keying Modulation for RIS-Assisted Noncoherent Communication Systems

The paper proposes optimal one- and two-sided multi-level amplitude shift keying (ASK) modulation schemes for reconfigurable intelligent surface (RIS)-assisted noncoherent wireless communication systems, considering both blocked and unblocked direct channel scenarios. The optimal modulation schemes are designed to minimize the symbol error probability under average transmit power constraints.