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This work demonstrates the effectiveness of a novel simultaneous transmissionand reflection reconfigurable intelligent surface (STAR-RIS) in Full-Duplex(FD) aided communication system. The objective is to minimize the totaltransmit power by jointly designing the transmit power and the transmitting andreflecting (T&R) coefficients of the STAR-RIS. To solve the nonconvex problem,an efficient algorithm is proposed by utilizing the alternating optimizationframework to iteratively optimize variables. Specifically, in each iteration,we drive the closed-form expression for the optimal power design. Thesuccessive convex approximation (SCA) method and semidefinite program (SDP) areused to solve the passive beamforming optimization problem. Numerical resultsverify the convergence and effectiveness of the proposed algorithm, and furtherreveal in which scenarios STAR-RIS assisted FD communication defeats theHalf-Duplex and conventional RIS.

Simultaneous Transmission and Reflection Reconfigurable Intelligent Surface Assisted Full-Duplex Communications