Hybrid Beamforming for Subarray-Level Movable Antenna Enhanced MU-MIMO Communications
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866918459545223168 |
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| author | Zhang, Shanshan Yang, Songjie Zhang, Wenxuan Xiong, Youzhi Yao, Siya |
| author_facet | Zhang, Shanshan Yang, Songjie Zhang, Wenxuan Xiong, Youzhi Yao, Siya |
| contents | This study investigates subarray-level movable antenna (MA) architecture for multi-user MIMO (MU-MIMO) systems. Unlike conventional systems with fixed-position antennas (FPAs), the proposed scheme harnesses the additional positional degrees of freedom (DoFs) of movable subarrays to enhance spatial multiplexing capabilities for both multi-user and multi-stream communications. Our objective is to maximize the overall system spectral efficiency by jointly optimizing the hybrid beamforming design and the positions of all subarrays. To tackle this challenging non-convex optimization problem, we first adopt a block diagonalization (BD) based digital precoder to effectively eliminate multi-user interference. Subsequently, the joint optimization of the analog beamformer and the subarray positions is efficiently solved using a sequential interference cancellation (SIC)-based algorithm. Simulation results demonstrate that the proposed SIC-MA method significantly outperforms the benchmark SIC-FPA scheme where subarrays are fixed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19338 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Hybrid Beamforming for Subarray-Level Movable Antenna Enhanced MU-MIMO Communications Zhang, Shanshan Yang, Songjie Zhang, Wenxuan Xiong, Youzhi Yao, Siya Signal Processing This study investigates subarray-level movable antenna (MA) architecture for multi-user MIMO (MU-MIMO) systems. Unlike conventional systems with fixed-position antennas (FPAs), the proposed scheme harnesses the additional positional degrees of freedom (DoFs) of movable subarrays to enhance spatial multiplexing capabilities for both multi-user and multi-stream communications. Our objective is to maximize the overall system spectral efficiency by jointly optimizing the hybrid beamforming design and the positions of all subarrays. To tackle this challenging non-convex optimization problem, we first adopt a block diagonalization (BD) based digital precoder to effectively eliminate multi-user interference. Subsequently, the joint optimization of the analog beamformer and the subarray positions is efficiently solved using a sequential interference cancellation (SIC)-based algorithm. Simulation results demonstrate that the proposed SIC-MA method significantly outperforms the benchmark SIC-FPA scheme where subarrays are fixed. |
| title | Hybrid Beamforming for Subarray-Level Movable Antenna Enhanced MU-MIMO Communications |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2604.19338 |