Detecting Angle of Arrival on a Hybrid RIS Using Intensity-Only Data
Detecting Angle of Arrival on a Hybrid RIS Using Intensity-Only Data
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DOI：
10.1109/lawp.2023.3288123
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发表时间：
2023-09
影响因子：
4.2
通讯作者：
Idban Alamzadeh;M. Imani
中科院分区：
文献类型：
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作者：
Idban Alamzadeh;M. Imani
可重构反射超表面——或可重构智能表面（RISs）——可以将事件信号重定向到所需的方向，这种能力允许根据所需的特性雕刻无线通信信道。然而，这种智能无线电环境需要在RIS上提供有关发射器和接收器的信息。一种可能的解决方案是为RIS增加传感能力。然而，感应复杂的无线信号（即振幅和相位）通常需要复杂的设置。在这封信中，我们提出并数值演示了一个可重构的反射元表面，它使用入射信号的仅强度样本来检索有关传播环境的所需信息。要做到这一点，我们将随机调整元表面元素，使其具有多路信息。然后使用计算鬼影成像算法对无相复用数据进行处理以检索所需信息。作为一个演示示例，我们给出了在自由空间环境中检测用户入射角的方法。这种简化的传感过程可以为在未来的无线通信或传感系统中整合具有集成传感能力的RISs铺平道路。
Reconfigurable reflective metasurfaces—or reconfigurable intelligent surfaces (RISs)—can redirect incident signals toward desired directions, an ability that allows for sculpting wireless communication channels with desired characteristics. This smart radio environment, however, necessitates the information about the transmitter(s) and the receiver(s) to be available at the RIS. One possible solution to this need is to add sensing capability to the RIS. However, sensing complex wireless signals (i.e., both amplitude and phase) often requires complicated setups. In this letter, we propose and numerically demonstrate a reconfigurable reflective metasurface that uses intensity-only samples of the incident signal to retrieve desired information about the propagation environment. To do that, we will randomly tune the metasurface elements to multiplex information incident on all of them. The phaseless multiplexed data are then processed using computational ghost imaging algorithm to retrieve the desired information. As a demonstrative example, we present the detection of the incident angle from a user in a free-space environment. This simplified sensing process can pave the way for incorporation of RISs with integrated sensing capabilities in future wireless communication or sensing systems.