Every optimal 1-bit RIS configuration aligns the channel vectors with a common direction, yielding an exact O(N^2) SISO algorithm and a structured MIMO sampling heuristic.
Asymp- totically optimal closed-form phase configuration of 1-bit RISs via sign alignment,
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Geometry-Informed Optimization of Binary RIS Configurations for Communication and Sensing
Every optimal 1-bit RIS configuration aligns the channel vectors with a common direction, yielding an exact O(N^2) SISO algorithm and a structured MIMO sampling heuristic.