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| Main Author: | |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.00898 |
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| _version_ | 1866917114575585280 |
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| author | Şenyuva, Rıfat Volkan |
| author_facet | Şenyuva, Rıfat Volkan |
| contents | We consider direction-of-arrival estimation in hybrid analog/digital mmWave MIMO receivers that employ DFT beamspace processing with a limited number of RF chains. Building on beamspace ESPRIT, we develop a covariance-guided beam selection framework that reconstructs a virtual fully digital subarray, fits a structured signal-plus-noise covariance model, and uses the resulting denoised covariance to select, for each coarse sector, a small contiguous block of DFT beams under a beam-budget constraint. The selected beams feed a sparse beamspace Unitary ESPRIT stage, so that the overall complexity is dominated by a single low-dimensional ESPRIT call while retaining a large effective aperture. Monte Carlo simulations for a 32-element uniform linear array with three paths show that, relative to a standard sectorization-based beam selector built on the same DFT codebook and ESPRIT estimator, the proposed method attains near Cramér--Rao bound accuracy at moderate array signal-to-noise ratios, substantially reduces the gap to the bound and the failure rate, and offers favorable accuracy--runtime trade-offs under dynamic RF budgets and sector-edge stress tests. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00898 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Covariance-Guided DFT Beam Selection for Beamspace ESPRIT in Hybrid mmWave MIMO Receivers Şenyuva, Rıfat Volkan Signal Processing We consider direction-of-arrival estimation in hybrid analog/digital mmWave MIMO receivers that employ DFT beamspace processing with a limited number of RF chains. Building on beamspace ESPRIT, we develop a covariance-guided beam selection framework that reconstructs a virtual fully digital subarray, fits a structured signal-plus-noise covariance model, and uses the resulting denoised covariance to select, for each coarse sector, a small contiguous block of DFT beams under a beam-budget constraint. The selected beams feed a sparse beamspace Unitary ESPRIT stage, so that the overall complexity is dominated by a single low-dimensional ESPRIT call while retaining a large effective aperture. Monte Carlo simulations for a 32-element uniform linear array with three paths show that, relative to a standard sectorization-based beam selector built on the same DFT codebook and ESPRIT estimator, the proposed method attains near Cramér--Rao bound accuracy at moderate array signal-to-noise ratios, substantially reduces the gap to the bound and the failure rate, and offers favorable accuracy--runtime trade-offs under dynamic RF budgets and sector-edge stress tests. |
| title | Covariance-Guided DFT Beam Selection for Beamspace ESPRIT in Hybrid mmWave MIMO Receivers |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2512.00898 |