Amazing stuff!
"... Researchers ... showed that a specific PM, known as a space-and-time-coding metasurface, could simultaneously support both sensing and wireless communication.
Their paper ... introduces two promising schemes for integrated sensing and communication (ISAC) that rely on a space-and-time-coding metasurface they developed. ...
Notably, the metasurface designed by Cui and his colleagues supports both the original frequency of a signal it is interacting with and additional harmonic frequencies, which can be controlled with high precision.
While the original frequency can be used to enable high-quality communication, the controllable harmonics support the real-time sensing of the surrounding environment and the detection of signals of interest via a machine-learning algorithm. ..."
From the abstract:
"Programmable metasurfaces (PMs), also called reconfigurable intelligent surfaces (RISs), are planar structures capable of dynamically manipulating electromagnetic waves in real-time. Regarded as a key enabling technology for implementing smart wireless propagation environments, PMs/RISs also serve as an ideal supporting platform for integrated sensing and communication (ISAC). Here, we propose two ISAC schemes based on a special type of PMs/RISs: space-time-coding metasurfaces (STCMs). By leveraging space-time-coding strategies, STCMs simultaneously control the propagation at the fundamental (carrier) frequency for reliable wireless communication and generate spatially distributed harmonics for sensing. The proposed schemes seamlessly integrate both communication and sensing on a shared hardware platform, eliminating the need for additional sensors. For experimental validation, we implemented an ISAC system using a 2-bit STCM operating at microwave frequencies. Experimental results align with theoretical predictions, confirming the practical viability and effectiveness of the proposed ISAC schemes for applications in communication, imaging, radar, and sensing systems."
Fig. 1: Conceptual illustration of the proposed space-time-coding metasurface (STCM)-based integrated sensing and communication (ISAC) scheme.
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