论文标题
可重新配置的智能表面（RIS）增强的双向OFDM通信
Reconfigurable Intelligent Surface (RIS)-Enhanced Two-Way OFDM Communications
论文作者
论文摘要
在本文中，我们专注于可重构的智能表面（RIS）增强的双向双向设备到设备（D2D）多对正交 - 频率 - 频率 - 划分 - 型 - 型 - 型 - 型 - ofdm）通信系统。具体而言，我们通过共同优化RIS的子带分配，功率分配和离散相移（PS）设计来最大化最小双向加权总和。为了解决RIS非Convex PS设计的主要难度，我们首先提出了半定义的放松问题，并通过利用投影的次级梯度方法来进一步为PS设计设计低复杂的解决方案。我们通过数值结果证明了所提出的设计的理想性能增益。
In this paper, we focus on the reconfigurable intelligent surface (RIS)-enhanced two-way device-to-device (D2D) multi-pair orthogonal-frequency-division-multiplexing (OFDM) communication systems. Specifically, we maximize the minimum bidirectional weighted sum-rate by jointly optimizing the sub-band allocation, the power allocation and the discrete phase shift (PS) design at the RIS. To tackle the main difficulty of the non-convex PS design at the RIS, we firstly formulate a semi-definite relaxation problem and further devise a low-complexity solution for the PS design by leveraging the projected sub-gradient method. We demonstrate the desirable performance gain for the proposed designs through numerical results.
