标题： 基于RIS赋能的OFDM系统中的集成通信和定位设计：一种相关色散方案 显示英文标题

标题： Integrated Communication and Positioning Design in RIS-empowered OFDM System: a Correlation Dispersion Scheme

摘要： 本文提出了一种新颖的综合通信和定位设计，该设计借助室内环境中的可重构智能表面（RIS）辅助的正交频分复用系统实现。 所关注区域位置上的导频信道频率响应（CFROPs）用于与离线CFROP数据库进行在线映射。 我们将最小化不同CFROPs相似性的目标转化为通过优化RIS的相位系数来创建差异化数据库的问题。 由于两级映射导致的时间变化，考虑了信道状态信息的不完美性。 我们提出了一个通用的优化问题，以最大化CFROPs的平均虚拟距离或最小虚拟距离。 通信服务需求被转换为约束条件。 讨论了一种折中情况，以在少量精度损失的情况下降低计算复杂度。 分析了一种称为相关分散的特殊性质。 这种性质能够消除传统定位方法中因空间一致性而引起的误差。 该性质与折中情况相互补充，并具有清晰且合乎逻辑的物理解释。 这一特定特性使我们的设计在高噪声环境下尤其优于其他设计。 当用户潜在位置的先验信息可用时，其性能更佳。 数值结果验证了我们设计的有效性。 显示英文摘要

摘要： In this paper, we propose a novel integrated communication and positioning design for orthogonal frequency division multiplexing system aided by a reconfigurable intelligent surface (RIS) in indoor circumstances. The channel frequency responses on pilots (CFROPs) of places of interest are used for online mapping with the offline CFROP database. We transform the objective of minimizing the similarity of different CFROPs into creating a differentiated database by optimizing the phase coefficients of RIS. Imperfect channel state information is considered due to time-varying caused by the two-stage mapping. We formulate a universal optimization problem for maximizing either the average or the minimum virtual distance of CFROPs. The communication service requirements are converted as constraints. A moderate case is discussed to reduce computational complexity with minor accuracy loss. A special property called correlation dispersion is analyzed. It is capable of eliminating the spatial consistency that incurs inaccuracy to traditional positioning methods. The property and the moderate case complement each other well with clear and logical physical interpretation. The particular characteristic makes our design outperform others especially in high-level-noise environments. It works even better when the prior information of user's potential location is available. The validity of our design is confirmed by numerical results.