Rotatable Antenna-Enhanced Cell-Free Communication
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Rotatable antenna (RA) is a promising technology that can exploit new spatial degrees-of-freedom (DoFs) by flexibly adjusting the three-dimensional (3D) boresight direction of antennas. In this letter, we investigate an RA-enhanced cell-free system for downlink transmission, where multiple RA-equipped access points (APs) cooperatively serve multiple single-antenna users over the same time-frequency resource. Specifically, we aim to maximize the sum rate of all users by jointly optimizing the AP-user associations and the RA boresight directions. Accordingly, we propose a two-stage strategy to solve the AP-user association problem, and then employ fractional programming (FP) and successive convex approximation (SCA) techniques to optimize the RA boresight directions. Numerical results demonstrate that the proposed RA-enhanced cell-free system significantly outperforms various benchmark schemes.
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Cited by 3 Pith papers
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Optimizing individual rotatable antenna orientations in ISAC systems maximizes the minimum sensing echo power over an extended region subject to communication rate constraints, with a closed-form solution for the sing...
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Antenna Orientation Optimization for Rotatable Antenna-Enabled ISAC Systems
Optimizes rotatable antenna pointing vectors in ISAC systems to maximize minimum echo power over a sensing region subject to user rate constraints, deriving a closed-form solution for the single-user far-field case an...
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