论文标题
可重新配置的智能表面辅助设备到设备通信的总和率最大化
Sum Rate Maximization for Reconfigurable Intelligent Surface Assisted Device-to-Device Communications
论文作者
论文摘要
在这封信中，我们建议采用可重构的智能表面（RISS）来增强D2D底层系统性能。我们研究了关节功率控制，接收波束形成和用于RIS辅助D2D底层蜂窝通信系统的被动光束，该系统被称为总和速率最大化问题。为了解决此问题，我们开发了一种块坐标下降方法，在该方法中，上行链路功率，接收波束形式和反射相移或反映相移。然后，我们为上行链路功率和接收波束形式提供了封闭形式的解决方案。我们进一步提出了一种基于二次变换的半明确弛豫算法，以优化RIS相移，其中原始的被动波束形成问题被转化为可分离的二次约束二次问题。数值结果表明，提出的RIS辅助设计可显着提高总和率的性能。
In this letter, we propose to employ reconfigurable intelligent surfaces (RISs) for enhancing the D2D underlaying system performance. We study the joint power control, receive beamforming, and passive beamforming for RIS assisted D2D underlaying cellular communication systems, which is formulated as a sum rate maximization problem. To address this issue, we develop a block coordinate descent method where uplink power, receive beamformer and refection phase shifts are alternatively optimized. Then, we provide the closed-form solutions for both uplink power and receive beamformer. We further propose a quadratic transform based semi-definite relaxation algorithm to optimize the RIS phase shifts, where the original passive beamforming problem is translated into a separable quadratically constrained quadratic problem. Numerical results demonstrate that the proposed RIS assisted design significantly improves the sum-rate performance.
