Received Antenna Array Design of GSSK-Based Antennas Selection for RIS-Assisted Communication

A wireless communication scheme named as the reconfigurable intelligent surface (RIS) assisted generalized space-shift keying (GSSK) based antennas selection (RIS-GKAS) is designed in this article. In this scheme, GSSK works at receiver and the reflected elements in the RIS can be adjusted to achieve the passive beamforming for the antennas selection to maximize the signal-to-noise ratio. This proposed scheme can be applied to a city with plenty of buildings. Specifically, the RIS is considered as an access point in this scheme and the received antennas are designed into a specific array for the antennas selection to achieve the passive beamforming. Besides, the performance analysis of the proposed scheme with maximum likelihood detector is presented. The results show that the RIS-GKAS has approving performance among various RIS-assisted index modulation schemes, and the designed pregreedy-aided maximum likelihood detector has the robustness among the multiple detectors under imperfect channel state information in RIS-GKAS scheme.