多RIS场景下节省发射功率的选择方案

Selection scheme in multi-RIs scenario to minimize transmit power

为了更好的发挥RIS节省发射功率、提高系统能量效率等优点,在多RIS场景下如何选择最合适反射表面的问题在本文中得到了解决。本文通过RIS辅助通信级联信道路损模型的特点提出了“路径乘积最小”选择方案,并采用发射功率和能量效率作为评价指标,在一个多RIS、多对D2D通信用户的场景下进行了仿真实验。仿真结果显示,“路径乘积最小”选择方案在节省发射功率和提高能量效率的效果上都要优于“路径之和最小”选择方案。所以,在通用的RIS应用场景下,根据远场路损信道特点,使用“路径乘积最小”是最优的选择方案。

In order to make better use of the advantages of RIS to save transmit power and improve system energy efficiency, the problem of how to choose the most suitable surface in multi-RIS scenarios is solved in this paper. This paper proposes a "minimum path product" selection scheme based on the characteristics of the RIS-assisted communication cascaded signal path loss model, and uses transmit power and energy efficiency as evaluation indicators. D2D communication user scenarios are simulated. The simulation results show that the "minimum path product" option is slightly better than the "minimum path sum" option in terms of saving transmit power and improving energy efficiency. Therefore, in the general RIS application scenario, according to the characteristics of the far-field path loss channel, using the "minimum path product" is the optimal choice.