The discrete movable-antenna position selection problem for MI maximization is shown to be monotone submodular under a minimum-spacing constraint, and a greedy algorithm achieves a 1/3 approximation in polynomial time.
Exploiting submodularity for efficient discrete movable antenna placement,
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Efficient Discrete Position Design for Movable Antenna Systems: Low Complexity and Robustness
The discrete movable-antenna position selection problem for MI maximization is shown to be monotone submodular under a minimum-spacing constraint, and a greedy algorithm achieves a 1/3 approximation in polynomial time.