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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2510.12406 |
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| _version_ | 1866908592048701440 |
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| author | Mobini, Zahra Ngo, Hien Quoc Rahimian, Ardavan Tukmanov, Anvar Townend, David Matthaiou, Michail Cotton, Simon L. |
| author_facet | Mobini, Zahra Ngo, Hien Quoc Rahimian, Ardavan Tukmanov, Anvar Townend, David Matthaiou, Michail Cotton, Simon L. |
| contents | We investigate a fronthaul-limited cell-free massive multiple-input multiple-output (CF-mMIMO) system and propose a hybrid centralized-distributed precoding strategy that dynamically adapts to varying fronthaul and spectral efficiency (SE) requirements. The proposed approach divides users into two groups: one served by centralized precoding and the other by distributed precoding. We formulate a novel optimization problem for user grouping and power control aimed at maximizing the sum SE, subject to fronthaul and per-access point (AP) power constraints. To tackle the problem, we transform it into a tractable form and propose efficient solution algorithms. Numerical results confirm the hybrid scheme's versatility and superior performance, consistently outperforming fully centralized and distributed approaches across diverse system configurations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12406 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hybrid centralized-distributed precoding in fronthaul-constrained CF-mMIMO systems Mobini, Zahra Ngo, Hien Quoc Rahimian, Ardavan Tukmanov, Anvar Townend, David Matthaiou, Michail Cotton, Simon L. Information Theory We investigate a fronthaul-limited cell-free massive multiple-input multiple-output (CF-mMIMO) system and propose a hybrid centralized-distributed precoding strategy that dynamically adapts to varying fronthaul and spectral efficiency (SE) requirements. The proposed approach divides users into two groups: one served by centralized precoding and the other by distributed precoding. We formulate a novel optimization problem for user grouping and power control aimed at maximizing the sum SE, subject to fronthaul and per-access point (AP) power constraints. To tackle the problem, we transform it into a tractable form and propose efficient solution algorithms. Numerical results confirm the hybrid scheme's versatility and superior performance, consistently outperforming fully centralized and distributed approaches across diverse system configurations. |
| title | Hybrid centralized-distributed precoding in fronthaul-constrained CF-mMIMO systems |
| topic | Information Theory |
| url | https://arxiv.org/abs/2510.12406 |