Low-Complexity Tensor Beamforming for RIS-Aided Multiuser Multistream MIMO Systems
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866918516388528128 |
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| author | Sokal, Bruno de Almeida, André L. F. Haardt, Martin |
| author_facet | Sokal, Bruno de Almeida, André L. F. Haardt, Martin |
| contents | We address joint active and passive beamforming for uplink RIS-assisted multi-user multi-stream MIMO systems with joint detection. The coupled design of the receive combiner, block-diagonal user precoders, and RIS phase vector is formulated through a third-order composite channel tensor. Exploiting this multilinear structure, we propose a multi-stream tensor alternating optimization method that updates the combiner, user precoders, and RIS coefficients via low-dimensional tensor projections. Simulations show that the proposed method approaches a multi-start alternating-optimization benchmark while reducing computational complexity and improving large-RIS scaling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_22360 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Low-Complexity Tensor Beamforming for RIS-Aided Multiuser Multistream MIMO Systems Sokal, Bruno de Almeida, André L. F. Haardt, Martin Signal Processing Systems and Control We address joint active and passive beamforming for uplink RIS-assisted multi-user multi-stream MIMO systems with joint detection. The coupled design of the receive combiner, block-diagonal user precoders, and RIS phase vector is formulated through a third-order composite channel tensor. Exploiting this multilinear structure, we propose a multi-stream tensor alternating optimization method that updates the combiner, user precoders, and RIS coefficients via low-dimensional tensor projections. Simulations show that the proposed method approaches a multi-start alternating-optimization benchmark while reducing computational complexity and improving large-RIS scaling. |
| title | Low-Complexity Tensor Beamforming for RIS-Aided Multiuser Multistream MIMO Systems |
| topic | Signal Processing Systems and Control |
| url | https://arxiv.org/abs/2605.22360 |