Towards Transmissive RIS Transceiver Enabled Uplink Communication Systems: Design and Optimization

In this paper, we propose a novel uplink communication system enabled by a transmissive reconfigurable intelligent surface (RIS) transceiver, where orthogonal frequency division multiple access (OFDMA) is applied to multiple users. Specifically, we explore a novel receiver architecture that includes a transmissive RIS and a single horn antenna for reception. Additionally, a channel model based on both planar and spherical waves is developed, accounting for far-field and near-field effects. To achieve the maximum system sum-rate of uplink communications while adhering to quality-of-service (QoS) constraints, we propose a joint optimization problem that optimizes power allocation, subcarrier allocation, and transmissive RIS coefficient. However, this problem is non-convex in view of the strong interdependence among the optimization variables, posing significant challenges for direct solution. Thus, alternating optimization (AO) algorithm architecture is employed, which decouples optimization variables and divide the problem into two sub-problems. The first sub-problem focuses on jointly optimizing power allocation and subcarrier allocation, and it is addressed by utilizing the Lagrangian dual decomposition method. Meanwhile, concerning the design of the transmissive RIS coefficient, the second sub-problem is tackled by means of the successive convex approximation (SCA) approach. Subsequently, these two sub-problems are solved in an alternating manner until the convergence criterion is met. At last, the numerical results indicate that the proposed algorithm exhibits excellent convergence performance and effectively enhances the system sum-rate compared to other benchmark algorithms.