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Ondrej Krejcar

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Open access 2026

Energy-Efficient Hexagonal QAM for Fluid Antenna Systems: ASER Analysis Under Imperfect CSI

This letter investigates the performance of an N-port FAS over Nakagami-m fading channels under imperfect CSI, and reveals that HQAM outperforms conventional QAM, achieving approximately 2 dB and 0.8 dB SNR gains over 128-RQAM and 256-SQAM, respectively.

Sukhsagar, Nagendra Kumar, Vimal Bhatia et al. · 0 citations
Review Open access Aug 2026

AI-based multimodal fusion of geophysical and geochemical data for subsurface characterization

Artificial intelligence (AI) increasingly supports subsurface characterization by integrating heterogeneous geophysical, geochemical, and spatial data. However, existing studies remain fragmented across disciplines and often leave unresolved questions about cross-modal physical coupling, fusion design, uncertainty prop...

H. Namazi, M. F. Sulaima, Ondrej Krejcar et al. · 0 citations

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