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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.04742 |
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| _version_ | 1866911316432650240 |
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| author | Pan, Kecheng Zheng, Beixiong Tan, Yanhua Björnson, Emil Schober, Robert Zhang, Rui |
| author_facet | Pan, Kecheng Zheng, Beixiong Tan, Yanhua Björnson, Emil Schober, Robert Zhang, Rui |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_04742 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rotatable Antenna-Enhanced Cell-Free Communication Pan, Kecheng Zheng, Beixiong Tan, Yanhua Björnson, Emil Schober, Robert Zhang, Rui Information Theory 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. |
| title | Rotatable Antenna-Enhanced Cell-Free Communication |
| topic | Information Theory |
| url | https://arxiv.org/abs/2512.04742 |