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Netw."],"published-print":{"date-parts":[[2025,5,31]]},"abstract":"<jats:p>\n            WiFi-based device localization is a key technology for smart applications, while most of which rely on LoS signals to work. However, in real-world indoor environments, very few LoS signals are usable for accurate localization. This article presents\n            <jats:sc>Bifrost<\/jats:sc>\n            , a novel hardware-software co-design to cope with this practical problem. The core idea of\n            <jats:sc>Bifrost<\/jats:sc>\n            is to reinvent WiFi signals to provide sufficient LoS signals. Specifically, we present a low-cost plug-in design of leaky wave antenna (LWA) that can generate orthogonal polarized signals: On the one hand, LWA disperses signals of different frequencies to different angles, thus providing AoA information for the localized target. On the other hand, the target further leverages the antenna polarization mismatch to distinguish AoAs from different LWAs. Besides, fine-grained information in CSI is exploited to mitigate multipath and noise. Besides, a dedicated Kalman filter is proposed to facilitate the cooperation of\n            <jats:sc>Bifrost<\/jats:sc>\n            and SpotFi, a state-of-the-art approach, to enhance the availability and accuracy of SpotFi. The evaluation results show that the median localization error of\n            <jats:sc>Bifrost<\/jats:sc>\n            is 0.81 m, 52.35% less than that of SpotFi. When combined with\n            <jats:sc>Bifrost<\/jats:sc>\n            to work in realistic settings, SpotFi can reduce the localization error by 33.54%.\n          <\/jats:p>","DOI":"10.1145\/3725850","type":"journal-article","created":{"date-parts":[[2025,3,25]],"date-time":"2025-03-25T13:59:25Z","timestamp":1742911165000},"page":"1-21","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Exploiting Dispersion Effect of Signals for Accurate Indoor WiFi Localization"],"prefix":"10.1145","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9384-5915","authenticated-orcid":false,"given":"Yimiao","family":"Sun","sequence":"first","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6676-4009","authenticated-orcid":false,"given":"Yuan","family":"He","sequence":"additional","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8034-6420","authenticated-orcid":false,"given":"Jiacheng","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0986-5209","authenticated-orcid":false,"given":"Xin","family":"Na","sequence":"additional","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-3518-0927","authenticated-orcid":false,"given":"Yande","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6207-2347","authenticated-orcid":false,"given":"Weiguo","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Software and BNRist, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8655-8130","authenticated-orcid":false,"given":"Xiuzhen","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Control Science and Engineering, Zhejiang University, Hangzhou, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2025,5,21]]},"reference":[{"key":"e_1_3_2_2_2","unstructured":"Amazon. 2023. 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