Analysis of Broad Beam Beamforming for Collocated and Distributed MIMO
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908477806346240 |
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| author | Kaplan, Ahmet Osorio, Diana P. M. Larsson, Erik G. |
| author_facet | Kaplan, Ahmet Osorio, Diana P. M. Larsson, Erik G. |
| contents | Broad beam beamforming (BF) design in multiple-input multiple-output (MIMO) can be convenient for initial access, synchronization, and sensing capabilities in cellular networks by avoiding overheads of sweeping methods while making efficient use of resources. Phase-only BF is key for maximizing power efficiency across antennas. A successful method to produce broad beams is the phase-only dual-polarization BF (DPBF). However, its efficiency has not been proved in non-line-of-sight (NLoS). Therefore, this paper contributes by evaluating DPBF in collocated and distributed MIMO configurations under both line-of-sight (LoS) and NLoS channel conditions. We model the reflection coefficients for different materials in NLoS conditions and propose the use of orthogonal space-time block code to improve the coverage compared to the DPBF in collocated MIMO (C-MIMO). We further propose a DPBF method for distributed MIMO and show that it achieves better coverage than C-MIMO with DPBF. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_02135 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analysis of Broad Beam Beamforming for Collocated and Distributed MIMO Kaplan, Ahmet Osorio, Diana P. M. Larsson, Erik G. Signal Processing Broad beam beamforming (BF) design in multiple-input multiple-output (MIMO) can be convenient for initial access, synchronization, and sensing capabilities in cellular networks by avoiding overheads of sweeping methods while making efficient use of resources. Phase-only BF is key for maximizing power efficiency across antennas. A successful method to produce broad beams is the phase-only dual-polarization BF (DPBF). However, its efficiency has not been proved in non-line-of-sight (NLoS). Therefore, this paper contributes by evaluating DPBF in collocated and distributed MIMO configurations under both line-of-sight (LoS) and NLoS channel conditions. We model the reflection coefficients for different materials in NLoS conditions and propose the use of orthogonal space-time block code to improve the coverage compared to the DPBF in collocated MIMO (C-MIMO). We further propose a DPBF method for distributed MIMO and show that it achieves better coverage than C-MIMO with DPBF. |
| title | Analysis of Broad Beam Beamforming for Collocated and Distributed MIMO |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2508.02135 |