Analysis of the Range Ambiguity Function of Narrowband Near-field MIMO Sensing
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866914316734693376 |
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| author | Wachowiak, Marcin Bourdoux, André Pollin, Sofie |
| author_facet | Wachowiak, Marcin Bourdoux, André Pollin, Sofie |
| contents | This paper compares the sensing performance of a narrowband near-field system across several practical antenna array geometries and SIMO/MISO and MIMO configurations. For identical transmit and receive apertures, MIMO processing is equivalent to squaring the near-field array factor, resulting in improved beamdepth and sidelobe level. Analytical derivations, supported by simulations, show that the MIMO processing improves the maximum near-field sensing range and resolution by approximately a factor of 1.4 compared to a single-aperture system. Using a quadratic approximation of the mainlobe of the array factor, an analytical improvement factor of $\sqrt{2}$ is derived, validating the numerical results. Finally, MIMO is shown to improve the poor sidelobe performance observed in the near-field by a factor of two, due to squaring of the array factor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10053 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analysis of the Range Ambiguity Function of Narrowband Near-field MIMO Sensing Wachowiak, Marcin Bourdoux, André Pollin, Sofie Signal Processing This paper compares the sensing performance of a narrowband near-field system across several practical antenna array geometries and SIMO/MISO and MIMO configurations. For identical transmit and receive apertures, MIMO processing is equivalent to squaring the near-field array factor, resulting in improved beamdepth and sidelobe level. Analytical derivations, supported by simulations, show that the MIMO processing improves the maximum near-field sensing range and resolution by approximately a factor of 1.4 compared to a single-aperture system. Using a quadratic approximation of the mainlobe of the array factor, an analytical improvement factor of $\sqrt{2}$ is derived, validating the numerical results. Finally, MIMO is shown to improve the poor sidelobe performance observed in the near-field by a factor of two, due to squaring of the array factor. |
| title | Analysis of the Range Ambiguity Function of Narrowband Near-field MIMO Sensing |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2505.10053 |