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Author

M. el-Hajjar

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Preprint Sep 2026

Technical Report OFDM-Assisted Simultaneous Quantum and Classical THz Communications

The feasibility of cost-effective simultaneous quantum and classical communication (SQCC) transmitting both the quantum key and classical information via a superimposed coherent state is investigated both in optical and Terahertz (THz) bands. Since the existing THz SQCC schemes assume single-carrier (SC) transmission o...

Xin Liu, Chao Xu, S. X. Ng et al. · 0 citations
Open access 2026

Active Sensing Based on 5G-NR Single-Numerology Filtered OFDM Signals

The studies and results demonstrate that the F-OFDM signals have the potential for the implementation of active communication-centric ISAC, which employ the flexibility for sensing implementation in either TD or FD, or in the joint frequency-time domains.

Tian-Yi Chen, M. el-Hajjar, Chao Xu et al. · 0 citations
2026

A Framework for Stacked Intelligent Metasurfaces With Geometry Design for Near-Field Communications

Stacked intelligent metasurfaces (SIMs) enable near-field wavefront shaping via multiple programmable layers. However, widely used wave-domain models often neglect power scaling, mutual coupling, and geometric flexibility, while multiport-network formulations are physically consistent but computationally heavy and typi...

Yi-Nuo Dong, S. X. Ng, M. el-Hajjar · 0 citations

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