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Meta-surfaces, also known as Reconfigurable Intelligent Surfaces (RIS), haveemerged as a cost-effective, low power consumption, and flexible solution forenabling multiple applications in Internet of Things (IoT). However, in thecontext of meta-surface-assisted multi-pair IoT communications, significantinterference issues often arise amount multiple channels. This issue isparticularly pronounced in scenarios characterized by Line-of-Sight (LoS)conditions, where the channels exhibit low rank due to the significantcorrelation in propagation paths. These challenges pose a considerable threatto the quality of communication when multiplexing data streams. In this paper,we introduce a meta-surface-aided communication scheme for multi-pairinteractions in IoT environments. Inspired by holographic technology, a novelcompensation method on the whole meta-surface has been proposed, which allowsfor independent multi-pair direct data streams transmission with lowinterference. To further reduce correlation under LoS channel conditions, wepropose a vortex beam-based solution that leverages the low correlationproperty between distinct topological modes. We use different vortex beams tocarry distinct data streams, thereby enabling distinct receivers to capturetheir intended signal with low interference, aided by holographicmeta-surfaces. Moreover, a prototype has been performed successfully todemonstrate two-pair multi-node communication scenario operating at 10 GHz withQPSK/16-QAM modulation.

Efficient Multi-Pair IoT Communication with Holographically Enhanced Meta-Surfaces Leveraging OAM Beams: Bridging Theory and Prototype