{"ID":23475271,"CreatedAt":"2026-09-18T01:09:05.407443952Z","UpdatedAt":"2026-09-20T18:11:56.143995915Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2609.20343","arxiv_id":"2609.20343","title":"Near-Field Localization Beyond Bandwidth Limits for Large-Aperture Pinching-Antenna Systems","abstract":"Conventional bandwidth-limited ranging resolves delay on the scale of \\(c_0/(2B)\\), yet a large distributed aperture can support substantially finer localization through near-field carrier-phase diversity. This letter characterizes the coherent main-lobe width of the localization likelihood for pinching-antenna systems and shows that it is governed by the spread of the direction cosines subtended by the aperture at the target. The resulting expression recovers classical far-field angular and Fresnel-range scalings and reduces to a wavelength-scale cell when the aperture subtends a large solid angle. Guided by this characterization, a hierarchical maximum-likelihood search is developed, combining noncoherent coarse localization, coherent lobe selection, and local refinement. Numerical results under scattering demonstrate submillimeter localization above a threshold signal-to-noise ratio without localization failures in the tested ensemble.","short_abstract":"Conventional bandwidth-limited ranging resolves delay on the scale of \\(c_0/(2B)\\), yet a large distributed aperture can support substantially finer localization through near-field carrier-phase diversity. This letter characterizes the coherent main-lobe width of the localization likelihood for pinching-antenna systems...","url_abs":"https://arxiv.org/abs/2609.20343","url_pdf":"https://arxiv.org/pdf/2609.20343v1","authors":"[\"Hyeonho Noh\"]","published":"2026-09-17T13:11:23Z","proceeding":"eess.SP","tasks":"[\"eess.SP\"]","methods":"[]","has_code":false}