In this paper, a novel transmissive reconfigurable intelligent surface (TRIS) transceiver empowered integrated sensing and communications (ISAC) system is proposed for future multi-demand terminals. To address interference management, we implement rate-splitting multiple access (RSMA), where the common stream is independently designed for the sensing service. We introduce the sensing quality of service (QoS) criteria based on this structure and construct an optimization problem with the sensing QoS criteria as the objective function to optimize the sensing stream precoding matrix and the communication stream precoding matrix. Due to the coupling of optimization variables, the formulated problem is a non-convex optimization problem that cannot be solved directly. To tackle the above-mentioned challenging problem, alternating optimization (AO) is utilized to decouple the optimization variables. Specifically, the problem is decoupled into three subproblems about the sensing stream precoding matrix, the communication stream precoding matrix, and the auxiliary variables, which is solved alternatively through AO until the convergence is reached. For solving the problem, successive convex approximation (SCA) is applied to deal with the sum-rate threshold constraints on communications, and difference-of-convex (DC) programming is utilized to solve rank-one non-convex constraints. Numerical simulation results verify the superiority of the proposed scheme in terms of improving the communication and sensing QoS.

翻译：本文提出了一种新型透射型可重构智能表面（TRIS）收发器赋能的通感一体化（ISAC）系统，以应对未来多需求终端场景。为处理干扰管理问题，我们采用了速率分割多址接入（RSMA）技术，其中公共流独立设计用于感知服务。基于该结构，我们引入了感知服务质量的量化准则，并以感知服务质量为优化目标构建了优化问题，旨在优化感知流预编码矩阵与通信流预编码矩阵。由于优化变量相互耦合，所构建的问题为无法直接求解的非凸优化问题。为攻克这一难题，我们采用交替优化（AO）方法解耦优化变量。具体而言，该问题被分解为关于感知流预编码矩阵、通信流预编码矩阵及辅助变量的三个子问题，并通过AO交替求解直至收敛。在求解过程中，应用逐次凸近似（SCA）处理通信的速率和阈值约束，同时利用凸差（DC）规划求解秩一非凸约束。数值仿真结果验证了所提方案在提升通信与感知服务质量方面的优越性。