Pinching Antenna Systems (PASS) for Cell-Free Communications
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910235507032064 |
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| author | Li, Haochen Lei, Jiayi Zeng, Cheng Hu, Zhaoming Dong, Chao Liu, Yuanwei |
| author_facet | Li, Haochen Lei, Jiayi Zeng, Cheng Hu, Zhaoming Dong, Chao Liu, Yuanwei |
| contents | A pinching antenna system (PASS) assisted cell-free communication system is proposed. A sum rate maximization problem under the BS power budget constraint and PA deployment constraint is formulated. To tackle the proposed non-convex optimization problem, an alternating optimization (AO) algorithm is developed. In particular, the digital beamforming sub-problem is solved using the weighted minimum mean square error (WMMSE) method, whereas the pinching beamforming sub-problem is handled via a penalty based approach combined with element-wise optimization. Simulation results demonstrate that: 1) the PASS assisted cell-free systems achieve superior performance over benchmark schemes; 2) increasing the number of PAs per waveguides can improve the advantage of PASS assisted cell-free systems; and 3) the cell-free architecture mitigates the average user rate degradation as the number of users increases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_03628 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pinching Antenna Systems (PASS) for Cell-Free Communications Li, Haochen Lei, Jiayi Zeng, Cheng Hu, Zhaoming Dong, Chao Liu, Yuanwei Signal Processing A pinching antenna system (PASS) assisted cell-free communication system is proposed. A sum rate maximization problem under the BS power budget constraint and PA deployment constraint is formulated. To tackle the proposed non-convex optimization problem, an alternating optimization (AO) algorithm is developed. In particular, the digital beamforming sub-problem is solved using the weighted minimum mean square error (WMMSE) method, whereas the pinching beamforming sub-problem is handled via a penalty based approach combined with element-wise optimization. Simulation results demonstrate that: 1) the PASS assisted cell-free systems achieve superior performance over benchmark schemes; 2) increasing the number of PAs per waveguides can improve the advantage of PASS assisted cell-free systems; and 3) the cell-free architecture mitigates the average user rate degradation as the number of users increases. |
| title | Pinching Antenna Systems (PASS) for Cell-Free Communications |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2510.03628 |