A grouped annulus modulation scheme with hexagonal-lattice constellation for RIS symbiotic radios achieves nearly full DoF over spatially correlated channels via a structured matrix decomposition algorithm.
Adaptive coding and channel shaping through reconfigurable intelligent surfaces: An information-theoretic analysis,
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Grouped Annulus-Modulated Transceiver Is Almost Full DoF-Achieving for RIS-Assisted Symbiotic Radios Over Spatial-Correlated Channels
A grouped annulus modulation scheme with hexagonal-lattice constellation for RIS symbiotic radios achieves nearly full DoF over spatially correlated channels via a structured matrix decomposition algorithm.