Joint Deployment and Beamforming Design for STAR-RIS Aided Communication

Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) offers a promising solution for achieving full space coverage. In this letter, we focus on a STAR-RIS assisted downlink communication system, where we jointly optimize the locations, passive transmitting and reflecting beamforming (BF) of the STAR-RISs, and the active BF at the base station (BS), to maximize the sum rate of users in non-line-of-sight (NLoS) areas. We propose a joint deployment and beamforming design algorithm to address the formulated non-convex optimization problem. Simulation results validate the superiority of our proposed algorithm.