Semi-Passive IRS Enabled Sensing With Group Movable Sensors

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-04-11 DOI:10.1109/LCOMM.2025.3560075

Qiaoyan Peng;Qingqing Wu;Wen Chen;Guangji Chen;Ying Gao;Lexi Xu;Shaodan Ma

引用次数: 0

Abstract

The performance of the sensing system is limited by the signal attenuation and the number of receiving components. In this letter, we investigate the sensor position selection in a semi-passive intelligent reflecting surface (IRS) enabled non-line-of-sight (NLoS) sensing system. The IRS consists of passive elements and active sensors, where the sensors can receive and process the echo signal for direction-of-arrival (DoA) estimation. Motivated by the movable antenna array and fluid antenna system, we consider the case where the sensors are integrated into a group for movement and derive the corresponding Cramer-Rao bound (CRB). Then, the optimal solution for the positions of the movable sensors (MSs) to the CRB minimization problem is derived in closed form. Moreover, we characterize the relationship between the CRB and system parameters. Theoretical analysis and numerical results are provided to demonstrate the superiority of the proposed MS scheme over the fixed-position (FP) scheme.

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半被动红外传感与组移动传感器

传感系统的性能受到信号衰减和接收器件数量的限制。在这封信中，我们研究了半被动智能反射面（IRS）支持的非视距（NLoS）传感系统中的传感器位置选择。IRS由无源元件和有源传感器组成，其中传感器可以接收和处理回波信号以估计到达方向（DoA）。在可移动天线阵列和流体天线系统的激励下，我们考虑了传感器集成成一组进行运动的情况，并推导了相应的Cramer-Rao界（CRB）。然后，以封闭形式导出了可动传感器位置的最优解。此外，我们还描述了CRB与系统参数之间的关系。理论分析和数值结果证明了所提出的MS格式相对于定位格式的优越性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.