标题： 同时传输和反射的RIS辅助移动边缘计算：计算速率最大化 显示英文标题

标题： Simultaneously Transmitting and Reflecting RIS-Aided Mobile Edge Computing: Computation Rate Maximization

摘要： 本文研究了新型的同时发射和反射（STAR）可重构智能表面（RIS），该表面能够实现对位于表面两侧用户的全空间覆盖，在多用户移动边缘计算（MEC）系统中进行研究。 通过联合设计STAR-RIS的相移、反射和传输幅度系数、接入点处的接收波束成形向量以及用户用于本地计算和卸载的能量分配策略，制定了一个计算速率最大化问题。 研究了STAR-RIS的两种操作协议，即能量分割（ES）和模式切换（MS）。 基于DC规划和半定松弛，提出了一种迭代算法来解决ES协议中的非凸问题。 此外，所提出的算法被扩展以解决具有二进制幅度系数的非凸、非连续MS问题。 仿真结果表明，与传统仅反射/仅传输RIS的基准方案相比，所得到的STAR-RIS辅助的MEC系统显著提高了计算速率。 显示英文摘要

摘要： In this paper, the novel simultaneously transmitting and reflecting (STAR) reconfigurable intelligent surface (RIS), which enables full-space coverage on users located on both sides of the surface, is investigated in the multi-user mobile edge computing (MEC) system. A computation rate maximization problem is formulated via the joint design of the STAR-RIS phase shifts, reflection and transmission amplitude coefficients, the receive beamforming vectors at the access point, and the users' energy partition strategies for local computing and offloading. Two operating protocols of STAR-RIS, namely energy splitting (ES) and mode switching (MS) are studied. Based on DC programming and semidefinite relaxation, an iterative algorithm is proposed for the ES protocol to solve the formulated non-convex problem. Furthermore, the proposed algorithm is extended to solve the non-convex, non-continuous MS problems with binary amplitude coefficients. Simulation results show that the resultant STAR-RIS-aided MEC system significantly improves the computation rate compared to the baseline scheme with conventional reflect-only/transmit-only RIS.